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Journal articles on the topic 'Anionic; Ligands'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Brennessel, William W., and John E. Ellis. "Crystal structure of (18-crown-6)potassium(I) [(1,2,3,4,5-η)-cycloheptadienyl][(1,2,3-η)-cycloheptatrienyl]cobalt(I)." Acta Crystallographica Section E Crystallographic Communications 71, no. 3 (February 21, 2015): 291–95. http://dx.doi.org/10.1107/s2056989015003151.

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The reaction of bis(anthracene)cobaltate(−I) with excess cycloheptatriene, C7H8, resulted in a new 18-electron cobaltate containing two different seven-membered ring ligands, based on single-crystal X-ray diffraction. The asymmetric unit of this structure contains two independent cation–anion pairs of the title complex, [K(18-crown-6)][Co(η3-C7H7)(η5-C7H9)], where 18-crown-6 stands for 1,4,7,10,13,16-hexaoxacyclooctadecane (C12H24O6), in general positions and well separated. Each (18-crown-6)potassium cation is in contact with the η3-coordinating ligand of one cobaltate complex. Each η3-coordinating ligand behaves as an allylic anion whoseexo-diene moiety is bent away from the allylic plane, and thus is not involved directly in the bonding. The metal-coordinating portions of the anionic η5ligands are planar and one of these ligands is modeled as disordered over two positions, with occupancy ratio 0.699 (5):0.301 (5), such that one orientation is rotated by one carbon atom with respect to the other. The diffraction intensities were integrated according to non-merohedral twin law [-1 0 0/0 -1 0/0.064 0 1], a 180° rotation about reciprocal lattice axis [001], and the masses of the twin domains refined to equal amounts. As both ligands are formally coordinated as anions, the cobalt atom is best considered to be CoI. This compound is of interest as the first to possess cycloheptatrienyl and cycloheptadienyl ligands in an anionic metal complex.

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2

Ha, Kwang. "Bis(acetato-κO)(di-2-pyridylamine-κ2N2,N2′)palladium(II)." Acta Crystallographica Section E Structure Reports Online 68, no. 4 (March 31, 2012): m502. http://dx.doi.org/10.1107/s1600536812012093.

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In the title complex, [Pd(CH3COO)2(C10H9N3)], the PdIIion is four-coordinated in a slightly distorted square-planar environment by two pyridine N atoms of the chelating di-2-pyridylamine (dpa) ligand and two O atoms from two anionic acetate ligands. The dpa ligand coordinates the PdIIatom in a boat conformation of the resulting chelate ring; the dihedral angle between the pyridine rings is 39.3 (2)°. The two acetate anions coordinate the PdIIatom as monodentate ligands and are located on the same sides of the PdN2O2unit plane. The carboxylate groups of the anionic ligands appear to be delocalized on the basis of the C—O bond lengths. Two complex molecules are assembled through intermolecular N—H...O hydrogen bonds, forming a dimer-type species. Intermolecular C—H...O hydrogen bonds further stabilize the crystal structure.

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3

Melgar, Dolores, Nuno A. G. Bandeira, Josep Bonet Avalos, and Carles Bo. "Anions coordinating anions: analysis of the interaction between anionic Keplerate nanocapsules and their anionic ligands." Physical Chemistry Chemical Physics 19, no. 7 (2017): 5343–50. http://dx.doi.org/10.1039/c6cp08511c.

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4

Han, Li-Juan, and Ya-Jie Kong. "Poly[(μ-pentafluorobenzoato-κ2O:O′)(pentafluorobenzoato-κO)(μ-pyrazine-κ2N:N′)copper(II)]: a coordination polymer linked into a three-dimensional network by intermolecular C—H...F—C interactions." Acta Crystallographica Section C Structural Chemistry 70, no. 11 (October 7, 2014): 1017–20. http://dx.doi.org/10.1107/s2053229614021536.

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In the title compound, [Cu(C6F5COO)2(C4H4N2)]n, (I), the asymmetric unit contains one CuIIcation, two anionic pentafluorobenzoate ligands and one pyrazine ligand. Each CuIIcentre is five-coordinated by three O atoms from three independent pentafluorobenzoate anions, as well as by two N atoms from two pyrazine ligands, giving rise to an approximately square-pyramidal coordination geometry. Adjacent CuIIcations are bridged by a pyrazine ligand and two pentafluorobenzoate anions to give a two-dimensional layer. The layers are stacked to generate a three-dimensional supramolecular architectureviastrong intermolecular C—H...F—C interactions, as indicated by the F...H distance of 2.38 Å.

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5

Neumann, Tristan, Inke Jess, and Christian Näther. "Crystal structure ofcatena-poly[[[bis(pyridine-4-carbothioamide-κN1)cadmium]-di-μ-thiocyanato-κ2N:S;κ2S:N] methanol disolvate]." Acta Crystallographica Section E Crystallographic Communications 72, no. 3 (February 20, 2016): 370–73. http://dx.doi.org/10.1107/s2056989016002632.

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The asymmetric unit of the polymeric title compound, {[Cd(NCS)2(C6H6N2S)]·2CH3OH}n, consists of one cadmium(II) cation that is located on a centre of inversion as well as one thiocyanate anion, one pyridine-4-carbothioamide ligand and one methanol molecule in general positions. The CdIIcations are octahedrally coordinated by the pyridine N atom of two pyridine-4-carbothioamide ligands and by the S and N atoms of four thiocyanate anions and are linked into chains along [010] by pairs of anionic ligands. These chains are further linked into layers extending along (201) by intermolecular N—H...O and O—H...S hydrogen bonds. One of the amino H atoms of the pyridine-4-carbothioamide ligand is hydrogen-bonded to the O atom of a methanol molecule, and a symmetry-related methanol molecule is the donor group to the S atom of another pyridine-4-carbothioamide ligand whereby each of the pyridine-4-carbothioamide ligands forms two pairs of centrosymmetric N—H...S and O—H...S hydrogen bonds. The methanol molecules are equally disordered over two orientations.

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6

Aly, Aref A. M., and Asma I. El-Said. "Spectral and Thermal Studies on Some New Anionic Mixed Alkyldithiocarbonato-Oxinato Transition Metal Complexes." Zeitschrift für Naturforschung B 44, no. 3 (March 1, 1989): 323–26. http://dx.doi.org/10.1515/znb-1989-0313.

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The preparation and characterization of some anionic mixed ligand com plexes of Co(II), Ni(II) and Cu(II) containing the two anionic ligands alkyldithiocarbonate and oxinate are reported. The ionic nature of the complexes was inferred from the conductivity data. Alkyldithiocarbonates act in these complexes as bidentate ligands. Based on the spectroscopic and magnetic data the complexes appear to possess pseudo-octahedral metal coordination.

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7

Lu, Yang, Wei-Qiang Liao, and Xiu-Ni Hua. "A new two-dimensional polymeric cadmium(II) complex containing dicyanamide bridging ligands." Acta Crystallographica Section C Structural Chemistry 73, no. 11 (October 6, 2017): 885–88. http://dx.doi.org/10.1107/s2053229617013614.

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As part of an exploration of new coordination polymers, a cadmium-dicyanamide complex, namely poly[benzyltriethylammonium [tri-μ-dicyanamido-κ6 N 1:N 5-cadmium(II)]], {(C13H22N)[Cd(C2N3)3]} n , has been synthesized by the reaction of benzyltriethylammonium bromide, cadmium nitrate tetrahydrate and sodium dicyanamide in aqueous solution, and characterized by single-crystal X-ray diffraction at room temperature. In the crystal structure, each CdII cation is coordinated by six nitrile N atoms from six anionic dicyanamide (dca) ligands to furnish a slightly distorted octahedral geometry. Neighbouring CdII cations are linked by dicyanamide bridges to construct a two-dimensional anionic layer coordination polymer. One amide N atom in the bridging dca ligand is disordered over two sites. The cations lie between the anionic frameworks and there are no hydrogen-bond interactions between the cations and anions. The organic cations are not involved in the formation of the supramolecular network.

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8

Fisher, Steven P., Anton W. Tomich, Juchen Guo, and Vincent Lavallo. "Teaching an old dog new tricks: new directions in fundamental and applied closo-carborane anion chemistry." Chemical Communications 55, no. 12 (2019): 1684–701. http://dx.doi.org/10.1039/c8cc09663e.

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In this feature article we cover new directions in the fundamental and applied chemistry of the closo-carborane anions [HCB₁₁H₁₁]⁻¹ and [HCB₉H₉]⁻¹, including energy storage applications, ionic liquids, anionic carborane fused heterocycles/radicals, ligand substituents, and ligands for catalysis and coordination chemistry.

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9

Buvaylo, Elena A., Vladimir N. Kokozay, Olga Yu Vassilyeva, and Brian W. Skelton. "Bis{2-[(pyridin-2-yl)methylideneamino]benzoato-κ3N,N′,O}chromium(III) nitrate monohydrate." Acta Crystallographica Section E Structure Reports Online 70, no. 4 (March 15, 2014): m136. http://dx.doi.org/10.1107/s1600536814005649.

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The title complex salt hydrate, [Cr(C13H9N2O2)2]NO3·H2O, comprises discrete cations, nitrate anions and solvent water molecules. The CrIIIatom is octahedrally coordinated by two anionic Schiff base ligands with the O atoms beingcis. The two ligands differ significantly with dihedral angles between the pyridine and benzene rings of 4.8 (2) and 24.9 (2)°. The nitrate anion and solvent water molecule were modelled as being disordered, with the major components having site-occupancy values of 0.856 (14) and 0.727 (16), respectively. The crystal is built of alternating layers of cations and of anions plus water molecules, stacked along thecaxis.

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10

Nicolas, Emmanuel, Thibault Cheisson, G. Bas de Jong, Cornelis G. J. Tazelaar, and J. Chris Slootweg. "A new synthetic route to the electron-deficient ligand tris(3,4,5-tribromopyrazol-1-yl)phosphine oxide." Acta Crystallographica Section C Structural Chemistry 72, no. 11 (October 5, 2016): 846–49. http://dx.doi.org/10.1107/s2053229616015035.

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The anionic tris(pyrazolyl)borates, or scorpionates, have proven to be extremely useful ligands. Neutral tris(pyrazolyl)methane ligands, however, are difficult to prepare and require numerous purification steps for a number of substitution patterns. We have previously outlined two different routes for accessing neutral tris(pyrazolyl) ligands. We describe here an adaptation of the previously published procedures for the synthesis of the electron-poor ligand tris(3,4,5-tribromopyrazol-1-yl)phosphine oxide, C9Br9N6OP. Similar electron-deficient ligands have been proven to unlock unique chemistry for the anionic scorpionates. The title perbrominated tris(pyrazolyl)phosphine oxide displays a network of halogen bonds in the solid state. All the bonds in the pyrazole ring are rather similar to the reported borate analogues, which makes this molecule promising as a ligand for applications where very electron-poor metal complexes are required.

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11

Unsleber, Jan P., Johannes Neugebauer, and Robert H. Morris. "DFT methods applied to answer the question: how accurate is the ligand acidity constant method for estimating the pKa of transition metal hydride complexes MHXL4 when X is varied?" Dalton Transactions 47, no. 8 (2018): 2739–47. http://dx.doi.org/10.1039/c7dt03473c.

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Additive ligand acidity constants A_L of anionic ligands are calculated for neutral hydrides of iron(ii), ruthenium(ii) and osmium(ii) with phosphine and carbonyl co-ligands; constant A_L in green, more variable A_L in red.

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12

Liu, Chen, Annaliese E. Thuijs, and Khalil A. Abboud. "Crystal structure ofcatena-poly[bis(tetraethylammonium) [tetraaquatris(μ-dicyanamido-κ2N1:N5)bis(dicyanamido-κN1)dicobaltate(II)] dicyanamide]." Acta Crystallographica Section E Crystallographic Communications 72, no. 11 (October 21, 2016): 1603–6. http://dx.doi.org/10.1107/s2056989016016637.

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The structure of the title compound, [N(C2H5)4]2[Co2(C2N3)5(H2O)4](C2N3), is a new example of a metal–dicyanamide coordination polymer which exhibits a unique three-dimensional framework of covalently linked CoIIchains. All bridging dicyanamide ligands in the title structure are in theμ1,5-bridging mode. The anionic CoII-dicyanamide network is templated by tetraethylammonium cations residing in a series of channels extending along thebaxis where additional non-coordinating dicyanamidate anions are also located. The framework structure is further stabilized by O—H...N hydrogen bonding between aqua ligands and dicyanamido ligands or the dicyanamide anion. In addition, C—H...N interactions are present between the tetraethylammonium cations and dicyanamide amide nitrogen atoms.

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13

Watanabe, Kohei, Atsushi Ueno, Xin Tao, Karel Škoch, Xiaoming Jie, Sergei Vagin, Bernhard Rieger, et al. "Reactions of an anionic chelate phosphane/borata-alkene ligand with [Rh(nbd)Cl]2, [Rh(CO)2Cl]2 and [Ir(cod)Cl]2." Chemical Science 11, no. 28 (2020): 7349–55. http://dx.doi.org/10.1039/d0sc02223c.

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14

Luo, Yanqing, Tao Tan, Sen Wang, Ran Pang, Lihong Jiang, Da Li, Jing Feng, Hongjie Zhang, Su Zhang, and Chengyu Li. "Multivariant ligands stabilize anionic solvent-oriented α-CsPbX3 nanocrystals at room temperature." Nanoscale 13, no. 9 (2021): 4899–910. http://dx.doi.org/10.1039/d0nr08697e.

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A self-assembly method is proposed for cubic phase CsPbX₃ nanocrystals under ambient conditions. Long-term stability and high quantum efficiency are maintained via ligand evolution from paired X type ligands to hybrid L–X type ligands.

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15

Thiel, Indre, and Marko Hapke. "The broad diversity of CpCo(I) complexes." Reviews in Inorganic Chemistry 34, no. 4 (December 1, 2014): 217–45. http://dx.doi.org/10.1515/revic-2014-0001.

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AbstractThe presented review will focus on the systematic overview of the available synthetic approaches and the reactivity and the structural characteristics of selected mononuclear CpCo(I) complexes with (non)chelating neutral donor ligands. The complexes containing symmetrical or unsymmetrical neutral ligand combinations aside from the anionic cyclopentadienyl (Cp) ligand will be discussed and the differences to complexes with substituted Cp ligands will be considered in selected cases.

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16

Lawrence, Samuel R., David B. Cordes, Alexandra M. Z. Slawin, and Andreas Stasch. "Mechanistic insights of anionic ligand exchange and fullerene reduction with magnesium(i) compounds." Dalton Transactions 48, no. 45 (2019): 16936–42. http://dx.doi.org/10.1039/c9dt03976g.

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17

Santiago, Tomás G., Carmen Urbaneja, Eleuterio Álvarez, Elena Ávila, Pilar Palma, and Juan Cámpora. "Neutral, cationic and anionic organonickel and -palladium complexes supported by iminophosphine/phosphinoenaminato ligands." Dalton Transactions 49, no. 2 (2020): 322–35. http://dx.doi.org/10.1039/c9dt04062e.

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Ligand exchange and oxidative addition reactions allow the synthesis of Ni(ii) and Pd(ii) complexes with deprotonable iminophosphine ligands. The acid–base behavior of iminophosphine ligands coordinated to organometallic Ni(ii) fragments is analyzed.

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18

Drozdov, A. A., S. I. Troyanov, A. P. Pisarevsky, and Yu T. Struchkov. "New oligomeric mixed ligand barium chelates containing additional anionic ligands." Polyhedron 13, no. 9 (May 1994): 1445–52. http://dx.doi.org/10.1016/s0277-5387(00)81713-1.

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19

Cuza, Emmelyne, Samia Benmansour, Nathalie Cosquer, Françoise Conan, Sébastien Pillet, Carlos J. Gómez-García, and Smail Triki. "Spin Cross-Over (SCO) Anionic Fe(II) Complexes Based on the Tripodal Ligand Tris(2-pyridyl)ethoxymethane." Magnetochemistry 6, no. 2 (June 7, 2020): 26. http://dx.doi.org/10.3390/magnetochemistry6020026.

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Reactions of Fe(II) with the tripodal chelating ligand 1,1,1-tris(2-pyridyl)ethoxymethane (py3C-OEt) and (NCE)− co-ligands (E = S, Se, BH3) give a series of mononuclear complexes formulated as [Fe(py3C-OEt)2][Fe(py3C-OEt)(NCE)3]2·2CH3CN, with E = S (1) and BH3 (2). These compounds are the first Fe(II) spin cross-over (SCO) complexes based on the tripodal ligand tris(2-pyridyl)ethoxymethane and on the versatile co-ligands (NCS)− and (NCBH3)−. The crystal structure reveals discrete monomeric isomorph structures formed by a cationic [Fe(py3C-OEt)2]2+ complex and by two equivalent anionic [Fe(py3C-OEt)(NCE)3]− complexes. In the cations the Fe(II) is facially coordinated by two py3C-OEt tripodal ligands whereas in the anion the three nitrogen atoms of the tripodal ligand are facially coordinated and the N-donor atoms of the three (NCE)− co-ligands occupy the remaining three positions to complete the distorted octahedral environment of the Fe(II) centre. The magnetic studies show the presence of gradual SCO for both complexes: A one-step transition around 205 K for 1 and a two-step transition for compound 2, centered around 245 K and 380 K.

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20

Łukasiewicz, Marta, Zbigniew Ciunik, and Stanisław Wołowiec. "Complexes of heteroscorpionate trispyrazolylborate anionic ligands." Polyhedron 19, no. 20-21 (October 2000): 2119–25. http://dx.doi.org/10.1016/s0277-5387(00)00512-x.

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21

Łukasiewicz, Marta, Zbigniew Ciunik, Tomasz Ruman, Małgorzata Skóra, and Stanisław Wołowiec. "Complexes of heteroscorpionate trispyrazolylborate anionic ligands." Polyhedron 20, no. 3-4 (February 2001): 237–44. http://dx.doi.org/10.1016/s0277-5387(00)00637-9.

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22

Zhou, Qin-Qin, Lei Jin, Wei-Qiang Liao, and Yi Zhang. "A potential molecular ferroelectric material: poly[[bis(1-aza-4-azoniabicyclo[2.2.2]octane)di-μ3-chlorido-tetra-μ2-chlorido-dichloridotricadmium(II)] dihydrate]." Acta Crystallographica Section C Crystal Structure Communications 69, no. 3 (February 16, 2013): 237–40. http://dx.doi.org/10.1107/s0108270113003892.

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The title compound, {[Cd3(C6H13N2)2Cl8]·2H2O}n, consists of pendant protonated cationic diamine ligands bonded to an anionic one-dimensional coordination polymer chloridocadmate scaffold. Each coordination chain features two kinds of CdIIcentre, each with distorted octahedral coordination geometry. One CdIIcation lies on a centre of inversion and is coordinated by six bridging chloride ligands, while the other is coordinated by four bridging chloride ligands, one terminal chloride ligand and a 1-aza-4-azoniabicyclo[2.2.2]octane aza N atom. This gives a reversible corner-sharing half-cubic linear polymer that lies along the crystallographicadirection. The chains interact through hydrogen bonding with solvent water, with each water molecule accepting one N—H...O interaction from a cation and donating to two O—H...Cl interactions with anionic chains, thus linking three separate chains and completing the packing structure.

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23

Finkina, Ekaterina I., Daria N. Melnikova, Ivan V. Bogdanov, Natalia S. Matveevskaya, Anastasia A. Ignatova, Ilia Y. Toropygin, and Tatiana V. Ovchinnikova. "Impact of Different Lipid Ligands on the Stability and IgE-Binding Capacity of the Lentil Allergen Len c 3." Biomolecules 10, no. 12 (December 13, 2020): 1668. http://dx.doi.org/10.3390/biom10121668.

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Previously, we isolated the lentil allergen Len c 3, belonging to the class of lipid transfer proteins, cross-reacting with the major peach allergen Pru p 3 and binding lipid ligands. In this work, the allergenic capacity of Len c 3 and effects of different lipid ligands on the protein stability and IgE-binding capacity were investigated. Impacts of pH and heat treating on ligand binding with Len c 3 were also studied. It was shown that the recombinant Len c 3 (rLen c 3) IgE-binding capacity is sensitive to heating and simulating of gastroduodenal digestion. While being heated or digested, the protein showed a considerably lower capacity to bind specific IgE in sera of allergic patients. The presence of lipid ligands increased the thermostability and resistance of rLen c 3 to digestion, but the level of these effects was dependent upon the ligand’s nature. The anionic lysolipid LPPG showed the most pronounced protective effect which correlated well with experimental data on ligand binding. Thus, the Len c 3 stability and allergenic capacity can be retained in the conditions of food heat cooking and gastroduodenal digestion due to the presence of certain lipid ligands.

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24

Nomura, Kotohiro. "Solution X-Ray Absorption Spectroscopy (XAS) for Analysis of Catalytically Active Species in Reactions with Ethylene by Homogeneous (Imido)vanadium(V) Complexes—Al Cocatalyst Systems." Catalysts 9, no. 12 (December 2, 2019): 1016. http://dx.doi.org/10.3390/catal9121016.

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Solution V K-edge XANES (X-ray absorption near edge structure) and EXAFS (extended X-ray absorption fine structure) analysis of vanadium(V) complexes containing both imido ligands and anionic ancillary donor ligands (L) of type, V(NR)(L)X2 (R = Ar, Ad (1-adamantyl); Ar = 2,6-Me2C6H3; X = Cl, Me, L = 2-(ArNCH2)C5H4N, OAr, WCA-NHC, and 2-(2’-benzimidazolyl)pyridine; WCA-NHC = anionic NHCs containing weak coordinating B(C6F5)3), which catalyze ethylene dimerization and/or polymerization in the presence of Al cocatalysts, has been explored. Different catalytically actives species with different oxidation states were formed depending upon the Al cocatalyst (MAO, Me2AlCl, AliBu3, etc.) and the anionic ancillary donor ligand employed. The method is useful for obtainment of the direct information of the active species (oxidation state, basic framework around the centered metal) in solution, and for better understanding in catalysis mechanism and organometallic as well as coordination chemistry.

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25

Liu, Yongchun, Zhengyin Yang, Kejun Zhang, Yun Wu, Jihua Zhu, and Tianlin Zhou. "Crystal Structures, Antioxidation, and DNA Binding Properties of SmIII Complexes." Australian Journal of Chemistry 64, no. 3 (2011): 345. http://dx.doi.org/10.1071/ch10302.

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The dinuclear SmIII complexes with 1:1 metal to ligand stoichiometry were prepared from Sm(NO3)3·6H2O and three anionic tetradentate Schiff-base ligands derived from 8-hydroxyquinoline-2-carboxyaldehyde with benzoylhydrazine, 2-hydroxybenzoylhydrazine, and isonicotinylhydrazine, respectively. All the ligands and complexes can bind strongly to calf thymus DNA through intercalation with the binding constants at 105–106 M–1, but complexes present stronger affinities to DNA than ligands. All the ligands and complexes have strong abilities of antioxidation, but complexes and ligands containing an active phenolic hydroxy group show stronger scavenging effects on hydroxyl radical, and SmIII complex containing N-heteroaromatic substituent shows stronger scavenging effects for superoxide radical.

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26

Wöhlert, Susanne, Mario Wriedt, Inke Jess, and Christian Näther. "Bis(dicyanamido-κN)tetrakis(pyridine-κN)nickel(II)." Acta Crystallographica Section E Structure Reports Online 68, no. 6 (May 12, 2012): m745. http://dx.doi.org/10.1107/s1600536812019691.

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In the crystal structure of the title compound, [Ni(C2N3)2(C5H5N)4], the NiII cations are coordinated by four pyridine ligands and two dicyanamide anions into discrete complexes. The shortest Ni...Ni separation is 8.1068 (10) Å. The structure is pseudo-centrosymmetric and can also be refined in the space group C2/c in which both anionic ligands are strongly disordered and the refinement leads to significantly poorer reliability factors.

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27

Mbiangué, Yves Alain, Alfred Bijvédé, Patrice Kenfack Tsobnang, Emmanuel Wenger, and Claude Lecomte. "Crystal structure of diammonium bis[tris(oxamide dioxime-κ2 N,N′)nickel(II)] bis[tris(oxalato-κ2 O,O′)chromate(III)] 6.76-hydrate." Acta Crystallographica Section E Crystallographic Communications 76, no. 11 (October 9, 2020): 1732–36. http://dx.doi.org/10.1107/s2056989020013390.

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The asymmetric unit of the title compound, (NH4)2[Ni(C2H6N4O2)3]2[Cr(C2O4)3]2·6.76H2O, comprises two NH4 + cations, two [Ni(C2H6N4O2)3]2+ cations and two [Cr(C2O4)3]3– anions, as well as eight water molecules of crystallization of which only one is fully occupied. In the cationic and anionic complexes, the central atoms (NiII and CrIII) are each surrounded by three bidentate ligands (N-chelating oxamide dioxime and O-chelating oxalate, respectively), resulting in distorted octahedral coordination spheres. In the crystal, O—H...O hydrogen bonds between the oxamide dioxime ligands as donor groups and the oxalate ligands as acceptor groups alternately connect the cationic and anionic complexes into infinite pillars extending parallel to [100]. Moreover, N—H...O hydrogen bonds between the same ligands connect neighboring pillars, thus delineating channels that accommodate the charge-balancing NH4 + cations as well as the water molecules of crystallization. Although the H atoms could not be localized for these two species, the corresponding N...O and O...O distances indicate hydrogen bonds of medium strength.

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28

Tole, Tegene T., Johannes H. L. Jordaan, and Hermanus C. M. Vosloo. "α-Pyridinyl Alcohols, α,α’-Pyridine Diols, α-Bipyridinyl Alcohols, and α,α’-Bipyridine Diols as Structure Motifs Towards Important Organic Molecules and Transition Metal Complexes." Current Organic Synthesis 17, no. 5 (July 27, 2020): 344–66. http://dx.doi.org/10.2174/1570179417666200212111049.

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Background: The preparation and use of pyridinyl alcohols as ligands showed incredible increment in the past three decades. Important property of pyridinyl alcoholato ligands is their strong basicity, which is mainly due to the lack of resonance stabilization of the corresponding anion. This strongly basic anionic nature gives them high ability to make bridges between metal centers rather than to bind to only one metal center in a terminal fashion. They are needed as ligands due to their ability to interact with transition metals both covalently (with oxygen) and hemilabile coordination (through nitrogen). Objective: The review focuses on the wide application of α-pyridinyl alcohols, α,α’-pyridine diols, α- bipyridinyl alcohols, and α,α’-bipyridine diols as structure motifs in the preparation of important organic molecules which is due to their strongly basic anionic nature. Conclusion: It is clear from the review that in addition to their synthetic utility in the homogeneous and asymmetric catalytic reactions, the preparation of the crown ethers, cyclic and acyclic ethers, coordinated borates (boronic esters), pyridinyl-phosphine ligands, pyridinyl-phosphite ligands, and pyridinyl-phosphinite ligands is the other broad area of application of pyridinyl alcohols. In addition to the aforementioned applications they are used for modeling mode of action of enzymes and some therapeutic agents. Their strongly basic anionic nature gives them high ability to make bridges between metal centers rather than to bind to only one metal center in a terminal fashion in the synthesis of transition metal cluster complexes. Not least numbers of single molecule magnets that can be used as storage of high density information were the result of transition metal complexes of pyridinyl alcoholato ligands.

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29

Devi, Rachna, Marikumar Rajendran, Kasturi Singh, Raksha Pal, and Sivakumar Vaidyanathan. "Smart luminescent molecular europium complexes and their versatile applications." Journal of Materials Chemistry C 9, no. 20 (2021): 6618–33. http://dx.doi.org/10.1039/d1tc01049b.

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A series of smart luminescent Eu(iii) complexes (C1 = Eu(DBM)₃ligand 1, C2 = Eu(DBM)₃ligand 2, C3 = Eu(DBM)₃ligand 3, C4 = Eu(DBM)₃ ligand 4, C5 = Eu(DBM)₃ligand 5) were synthesized by using C1-functionalized phenanthro-imidazole derivatives as the neutral ligands and dibenzoylmethanate (DBM) as the anionic ligand.

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30

Karsch, H. H. "Ambidentate, Anionic Phosphine Ligands in Organoelement Chemistry." Phosphorus, Sulfur, and Silicon and the Related Elements 77, no. 1-4 (April 1993): 41–44. http://dx.doi.org/10.1080/10426509308045614.

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31

Kobayashi, Kaede, Yukina Harada, Kazuki Ikenaga, Yasutaka Kitagawa, Masayoshi Nakano, and Takashi Kajiwara. "Correlation between Slow Magnetic Relaxations and Molecular Structures of Dy(III) Complexes with N5O4 Nona-Coordination." Magnetochemistry 5, no. 2 (April 18, 2019): 27. http://dx.doi.org/10.3390/magnetochemistry5020027.

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A series of Dy(III) mononuclear complexes [DyA2L]+ (L denotes Schiff base N5 ligand that occupies equatorial positions and A− denotes bidentate anionic O-donor ligands such as NO3− (1), AcO− (2), and acac− (3)) were synthesized to investigate the correlation between the slow magnetic relaxation phenomena and the coordination structures around Dy(III). The Dy(III) ion in each complex is in a nona-coordination with the anionic O-donor ligand occupying up- and down-side positions of the N5 equatorial plane. 2 and 3 show slow magnetic relaxation phenomena under a zero bias-field condition, and all complexes showed slow magnetic relaxation under the applied 1000-Oe bias-field conditions. Arrhenius analyses revealed that the ΔE/kB, the barrier height for magnetization flipping, increases in this order, with the values of 24.1(6), 85(3), and 140(15) K. The effects of the exchanging axial ligands on the magnetic anisotropy were discussed together with the DFT calculations.

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32

Simler, Thomas, Andreas A. Danopoulos, and Pierre Braunstein. "Non-symmetrical, potentially redox non-innocent imino NHC pyridine ‘pincers’ via a zinc ion template-assisted synthesis." Dalton Transactions 46, no. 18 (2017): 5955–64. http://dx.doi.org/10.1039/c7dt01014a.

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A Zn^II-promoted modular synthesis allows access to new non-symmetrical, redox-active imino NHC pyridine pincer ligands. Radical anionic and dianionic redox states of the ligand are involved in its Fe^II complexes obtained from FeBr₂/KC₈.

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33

Steczek, Lukasz, Jerzy Narbutt, Marie-Christine Charbonnel, and Philippe Moisy. "Determination of formation constants of uranyl(VI) complexes with a hydrophilic SO3-Ph-BTP ligand, using liquid-liquid extraction." Nukleonika 60, no. 4 (December 1, 2015): 821–27. http://dx.doi.org/10.1515/nuka-2015-0150.

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Abstract Complex formation between uranyl ion, UO22+, and a hydrophilic anionic form of SO3-Ph-BTP4- ligand, L4-, in water was studied by liquid-liquid extraction experiments performed over a range of the ligand and HNO3 concentrations in the aqueous phase, at a constant concentration of nitrate anions at 25°C . The competition for UO22+ ions between the lipophilic TODGA extractant and the hydrophilic L4- ligand leads to the decrease in the uranyl distribution ratios, D, with an increasing L4- concentration. The model of the solvent extraction process used accounts - apart from uranyl complexation by TODGA and SO3-Ph-BTP4- - also for uranyl complexation by nitrates and for the decrease in the concentration of the free L4- ligand in the aqueous phase, due to its protonation, bonding in the uranyl complex and the distribution between the two liquid phases. The unusually strong dependence of the D values on the acidity, found in the experiment, could hardly be explained as due to L4- protonation merely. Three hypotheses were experimentally tested, striving to interpret the data in terms of additional extraction to the organic phase of ion associates of protonated TODGA cation with either partly protonated anionic L4- ligands or anionic UO22+ complexes with NO3 - or L4-. None of them has been confirmed. The analysis of the results, based on the formal correction of free ligand concentrations, points to the formation of 1 : 1 and 1 : 2 uranyl - SO3-Ph-BTP complexes in the aqueous phase. The conditional formation constant of the 1:1 complex has been determined, logßL,1 = 2.95 ± 0.15.

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34

Cheng, Kai, Qi-Xia Bai, Shao-Jun Hu, Xiao-Qing Guo, Li-Peng Zhou, Ting-Zheng Xie, and Qing-Fu Sun. "Water-stable lanthanide–organic macrocycles from a 1,2,4-triazole-based chelate for enantiomeric excess detection and pesticide sensing." Dalton Transactions 50, no. 17 (2021): 5759–64. http://dx.doi.org/10.1039/d1dt00726b.

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Water-stable anionic Ln₂L₂-type macrocycles have been constructed from a 1,2,4-triazole-based ligand, of which the luminescent Eu₂L₂ macrocycle can be used for ee detection toward pybox-type chiral ligands and selective sensing of OMA in water.

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35

Wang, Hui-Ting. "Two different anionic manganese(II) coordination polymers constructed through dicyanamide coordination bridges." Acta Crystallographica Section C Structural Chemistry 71, no. 10 (September 18, 2015): 850–55. http://dx.doi.org/10.1107/s2053229615015818.

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In order to explore new metal coordination polymers and to search for new types of ferroelectrics among hybrid coordination polymers, two manganese dicyanamide complexes, poly[tetramethylammonium [di-μ3-dicyanamido-κ6N1:N3:N5-tri-μ2-dicyanamido-κ6N1:N5-dimanganese(II)]], {[(CH3)4N][Mn2(NCNCN)5]}n, (I), andcatena-poly[bis(butyltriphenylphosphonium) [[(dicyanamido-κN1)manganese(II)]-di-μ2-dicyanamido-κ4N1:N5]], {[(C4H9)(C6H5)3P]2[Mn(NCNCN)4]}n, (II), were synthesized in aqueous solution. In (I), one MnIIcation is octahedrally coordinated by six nitrile N atoms from six anionic dicyanamide (dca) ligands, while the second MnIIcation is coordinated by four nitrile N atoms and two amide N atoms from six anionic dca ligands. Neighbouring MnIIcations are linked together by μ-1,5- and μ-1,3,5-bridging dca anions to form a three-dimensional polymeric structure. The anionic framework exhibits a solvent-accessible void of 289.8 Å3, amounting to 28.0% of the total unit-cell volume. Each of the cavities in the network is occupied by only one tetramethylammonium cation. In (II), each MnIIcation is octahedrally coordinated by six nitrile N atoms from six dca ligands. Neighbouring MnIIcations are linked together by double dca bridges to form a one-dimensional polymeric chain, and C—H...N hydrogen-bonding interactions are involved in the formation of the one-dimensional layer structure.

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36

Neumann, Tristan, Inke Jess, Cesar dos Santos Cunha, Huayna Terraschke, and Christian Näther. "Cd(II) and Zn(II) thiocyanate coordination compounds with 3-ethylpyridine: synthesis, crystal structures and properties." Zeitschrift für Naturforschung B 73, no. 2 (February 23, 2018): 115–23. http://dx.doi.org/10.1515/znb-2017-0186.

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AbstractReaction of Cd(NCS)2 and Zn(NCS)2 with 3-ethylpyridine leads to the formation of compounds of compositions M(NCS)2(3-ethylpyridine)4 (M=Cd, 1-Cd; Zn, 1-Zn) and M(NCS)2(3-ethylpyridine)2 (M=Cd, 2-Cd; Zn, 2-Zn). 1-Cd and 1-Zn are isotypic and form discrete complexes in which the metal cations are octahedrally coordinated by two trans-coordinating N-bonded thiocyanate anions and four 3-ethylpyridine co-ligands. In 2-Cd the cations are also octahedrally coordinated but linked into chains by pairs of μ-1,3-bridging anionic ligands. 2-Zn is built up of discrete complexes, in which the Zn cation is tetrahedrally coordinated by two N-bonded thiocyanate anions and two 3-ethylpyridine co-ligands. Compounds 1-Cd, 2-Cd and 2-Zn can be prepared in a pure state, whereas 1-Zn is unstable and transforms on storage into 2-Zn. If 1-Cd and 1-Zn are heated, a transformation into 2-Cd, respectively 2-Zn is observed. Luminescence measurements reveal that 1-Cd, 2-Cd and 2-Zn emit light in the blue spectral range with maxima at, respectively, 21724, 21654 and 22055 cm−1, assigned to ligand-based luminescence.

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37

Narro, Ana L., Hadi D. Arman, and Zachary J. Tonzetich. "Manganese Chemistry of Anionic Pyrrole-Based Pincer Ligands." Organometallics 38, no. 8 (April 9, 2019): 1741–49. http://dx.doi.org/10.1021/acs.organomet.9b00058.

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38

Brammer, L., G. M. Espallargas, J. Ormond-Prout, I. V. Yrezabal, S. Libri, and F. Zordan. "Halogen bonding involving metallate ions and anionic ligands." Acta Crystallographica Section A Foundations of Crystallography 67, a1 (August 22, 2011): C136. http://dx.doi.org/10.1107/s0108767311096656.

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39

Pascu, Mirela, Mathieu Marmier, Clément Schouwey, Rosario Scopelliti, Julian J. Holstein, Gérard Bricogne, and Kay Severin. "Anionic Bipyridyl Ligands for Applications in Metallasupramolecular Chemistry." Chemistry - A European Journal 20, no. 19 (April 2, 2014): 5592–600. http://dx.doi.org/10.1002/chem.201400285.

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40

Pascu, Mirela, Mathieu Marmier, Clément Schouwey, Rosario Scopelliti, Julian J. Holstein, Gérard Bricogne, and Kay Severin. "Anionic Bipyridyl Ligands for Applications in Metallasupramolecular Chemistry." Chemistry - A European Journal 20, no. 19 (April 15, 2014): 5517. http://dx.doi.org/10.1002/chem.201400432.

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41

Fedushkin, Igor L., Olga V. Eremenko, Alexandra A. Skatova, Alexander V. Piskunov, Georgi K. Fukin, Sergey Yu Ketkov, Elisabeth Irran, and Herbert Schumann. "Binuclear Zinc Complexes with Radical-Anionic Diimine Ligands." Organometallics 28, no. 13 (July 13, 2009): 3863–68. http://dx.doi.org/10.1021/om900291x.

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42

Cutruzzolà, Francesca, Carlo Travaglini Allocatelli, Paolo Ascenzi, Martino Bolognesi, Stephen G. Sligar, and Maurizio Brunori. "Control and recognition of anionic ligands in myoglobin." FEBS Letters 282, no. 2 (May 6, 1991): 281–84. http://dx.doi.org/10.1016/0014-5793(91)80495-o.

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43

Zhang, Jinfang. "catena-Poly[[tetrakis(hexamethylphosphoramide-κO)bis(nitrato-κ2 O,O′)terbium(III)] [silver(I)-di-μ-sulfido-tungstate(VI)-di-μ-sulfido]]." Acta Crystallographica Section E Structure Reports Online 68, no. 6 (May 31, 2012): m843—m844. http://dx.doi.org/10.1107/s1600536812023823.

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In the title compound, {[Tb(NO3)2(C6H18N3OP)4][AgWS4]} n , the polymeric anionic chain {[AgWS4]−} n extends along [001]. The TbIII atom in the cation is coordinated by eight O atoms from two nitrate and four hexamethylphosphate ligands in a distorted square-antiprismatic geometry. Together with the two nitrate ligands, the cation is univalent, which leads to the anionic chain having a [WS4Ag] repeat unit. The polymeric anionic chain has a distorted linear configuration with W—Ag—W and Ag—W—Ag angles of 161.49 (2) and 153.743 (13) °, respectively. The title complex is isotypic with the Y, Yb, Eu, Nd, La, Dy, Sm and Lu analogues.

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44

Sun, Lijun, Songlin Zhang, and Qijun Song. "(4-Chloroacetanilido-κ2N,O)bis[2-(pyridin-2-yl)phenyl-κ2C1,N]iridium(III)." Acta Crystallographica Section E Structure Reports Online 69, no. 2 (January 12, 2013): m98. http://dx.doi.org/10.1107/s1600536813000433.

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In the neutral mononuclear iridium(III) title compound, [Ir(C8H7ClNO)(C11H8N)2], the IrIIIatom adopts an octahedral geometry, and is coordinated by two 2-phenylpyridyl ligands and one anionic 4-chloroacetanilide ligand. The 2-phenylpyridyl ligands are arranged in acis-C,C′ andcis-N,N′ fashion. Each 2-phenylpyridyl ligand forms a five-membered ring with the IrIIIatom. The 2-phenylpyridyl planes are perpendicular to each other [dihedral angle = 89.9 (1)°]. The Ir—C and Ir—N bond lengths are comparable to those reported for related iridium(III) 2-phenylpyridyl complexes. The remaining two coordination sites are occupied by the amidate N and O atoms, which form a four-membered ring with the iridium atom (Ir—N—C—O). The amidate plane is nearly perpendicular to both 2-phenylpyridyl ligands [dihedral angles = 87.8 (2) and 88.3 (2)°].

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45

Muñoz-Molina, José María, Tomás R. Belderrain, and Pedro J. Pérez. "Group 11 tris(pyrazolyl)methane complexes: structural features and catalytic applications." Dalton Transactions 48, no. 29 (2019): 10772–81. http://dx.doi.org/10.1039/c9dt01661a.

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46

Wombacher, Tobias, Richard Goddard, Christian W. Lehmann, and Jörg J. Schneider. "Complete charge separation provoked by full cation encapsulation in the radical mono- and di-anions of 5,6:11,12-di-o-phenylene-tetracene." Dalton Transactions 47, no. 32 (2018): 10874–83. http://dx.doi.org/10.1039/c8dt01285g.

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Full encapsulation of the K⁺counterions between two benzo-15-crown-5-ether (B15C5) ligands results in a (κ¹⁰O) environment which ensures a complete cation/anion separation resulting in planar bare anionic PAH species [L_DOPT˙⁻] and [L_DOPT²⁻].

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47

Mirzaei, Masoud, Hossein Eshtiagh-Hosseini, Ehsan Eydizadeh, Zakieh Yousefi, and Krešimir Molčanov. "9-Aminoacridinium bis(pyridine-2,6-dicarboxylato-κ3 O 2,N,O 6)ferrate(III) tetrahydrate." Acta Crystallographica Section E Structure Reports Online 68, no. 6 (May 12, 2012): m761—m762. http://dx.doi.org/10.1107/s1600536812020247.

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The asymmetric unit of the title compound, (C13H11N2)[Fe(C7H3NO4)2]·4H2O, contains a 9-aminoacridinium cation, one anionic complex and four uncoordinated water molecules. In the anionic complex, the FeIII ion is six-coordinated by two almost perpendicular [dihedral angle = 88.78 (7)°] pyridine-2,6-dicarboxylate ligands in a distorted octahedral geometry. In the crystal, anions are connected into chains along [10-1] by weak C—H...O interactions, which create ten-membered hydrogen-bonded R 2 2(10) rings. These chains are linked by three-membered water clusters. The final three-dimensional network is constructed by numerous intermolecular O—H...O and N—H...O interactions.

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48

Katsoulakou, Eugenia, Konstantis F. Konidaris, Catherine P. Raptopoulou, Vassilis Psyharis, Evy Manessi-Zoupa, and Spyros P. Perlepes. "Synthesis, X-Ray Structure, and Characterization ofCatena-bis(benzoate)bis{N,N-bis(2-hydroxyethyl)glycinate}cadmium(II)." Bioinorganic Chemistry and Applications 2010 (2010): 1–8. http://dx.doi.org/10.1155/2010/281932.

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The reaction of -bis(2-hydroxyethyl)glycine (bicine; ) with in MeOH yielded the polymeric compound . The complex crystallizes in the tetragonal space group . The lattice constants are and Å. The compound contains chains of repeating units. One atom is coordinated by two carboxylate oxygen, four hydroxyl oxygen, and two nitrogen atoms from two symmetry-related 2.21111 (Harris notation) ligands. The other atom is coordinated by six carboxylate oxygen atoms, four from two ligands and two from the monodentate benzoate groups. Each bicinate(-1) ligand chelates the 8-coordinate, square antiprismatic atom through one carboxylate oxygen, the nitrogen, and both hydroxyl oxygen atoms and bridges the second, six-coordinate trigonal prismatic center through its carboxylate oxygen atoms. Compound1is the first structurally characterized cadmium(II) complex containing any anionic form of bicine as ligand. IR data of1are discussed in terms of the coordination modes of the ligands and the known structure.

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49

Donnelly, Liam J., Simon Parsons, Carole A. Morrison, Stephen P. Thomas, and Jason B. Love. "Synthesis and structures of anionic rhenium polyhydride complexes of boron–hydride ligands and their application in catalysis." Chemical Science 11, no. 36 (2020): 9994–99. http://dx.doi.org/10.1039/d0sc03458d.

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Exhaustive deoxygenation of perrhenate by pinacol borane forms a new Re anion of boron and hydride ligands only that undergoes borane ligand exchange, stoichiometric C–H boration, and catalytic pyridine hydroboration.

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50

Li, Qiang, and Hui-Ting Wang. "A new three-dimensional anionic cadmium(II) dicyanamide network." Acta Crystallographica Section C Structural Chemistry 70, no. 11 (October 15, 2014): 1054–56. http://dx.doi.org/10.1107/s2053229614022360.

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A new cadmium dicyanamide complex, poly[tetramethylphosphonium [μ-chlorido-di-μ-dicyanamido-κ4N1:N5-cadmium(II)]], [(CH3)4P][Cd(NCNCN)2Cl], was synthesized by the reaction of tetramethylphosphonium chloride, cadmium nitrate tetrahydrate and sodium dicyanamide in aqueous solution. In the crystal structure, each CdIIatom is octahedrally coordinated by four terminal N atoms from four anionic dicyanamide (dca) ligands and by two chloride ligands. The dicyanamide ligands play two different roles in the building up of the structure; one role results in the formation of [Cd(dca)Cl]2building blocks, while the other links the building blocks into a three-dimensional structure. The anionic framework exhibits a solvent-accessible void of 673.8 Å3, amounting to 47.44% of the total unit-cell volume. The cavities in the network are occupied by pairs of tetramethylphosphonium cations.

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