Готові списки джерел за темами / Azides; Complex ions

Добірка наукової літератури з теми "Azides; Complex ions"

Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 28 січня 2023

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Статті в журналах з теми "Azides; Complex ions"

Abu-Youssef, Morsy A. M., Vratislav Langer, Assem Barakat, Matti Haukka, and Saied M. Soliman. "Molecular, Supramolecular Structures Combined with Hirshfeld and DFT Studies of Centrosymmetric M(II)-azido {M=Ni(II), Fe(II) or Zn(II)} Complexes of 4-Benzoylpyridine." Symmetry 13, no. 11 (October 26, 2021): 2026. http://dx.doi.org/10.3390/sym13112026.

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Анотація:

The supramolecular structures of the three metal (II) azido complexes [Fe(4bzpy)4(N3)2]; 1, [Ni(4bzpy)4(N3)2]; 2 and [Zn(4bzpy)2(N3)2]n; 3 with 4-benzoylpyridine (4bzpy) were presented. All complexes contain hexa-coordinated divalent metal ions with a slightly distorted octahedral MN6 coordination sphere. Complexes 1 and 2 are monomeric with terminal azido groups while 3 is one-dimensional coordination polymer containing azido groups with μ(1,1) and μ(1,3) bridging modes of bonding. Hirshfeld analysis was used to quantitatively determine the different contacts affecting the molecular packing in the studied complexes. The most common interactions are the polar O…H and N…H interactions and the hydrophobic C…H contacts. The charges at the M(II) sites are calculated to be 1.004, 0.847, and 1.147 e for complexes 1–3, respectively. The degree of asymmetry is the highest in the case of the terminal azide in complexes 1 and 2 while was found the lowest in the μ(1,1) and μ(1,3) azide bonding modes in the Zn(II) complex 3. These facts were further explained in terms of atoms in molecules (AIM) topological parameters.

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Qian, Kun, Yiyong Xu, Zengtao Wang, and Jie Yang. "Synthesis, crystal structure, and magnetic properties of an azido-bridged Mn(II) complex [C3H5NH3][Mn(N3)3]." Zeitschrift für Naturforschung B 72, no. 6 (May 24, 2017): 409–13. http://dx.doi.org/10.1515/znb-2016-0267.

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AbstractA new compound [C3H5NH3][Mn(N3)3] has been synthesized, in which the Mn2+ ions are connected by the end-to-end azide anions to form the 3D architecture, while the C3H5NH3+ cations reside in the cavities of the Mn2+–N3− network, forming rich N−H···N hydrogen bonds with the terminal N atoms of the azide anions. The complex has been characterized by IR spectroscopy, elemental analyses, and magnetic measurements. Magnetic susceptibility data indicate antiferromagnetic interaction among the MnII ions.

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Zhao, Qi-Hua, Ai-Ling Fan, Li-Nan Li та Ming-Jing Xie. "Diazidobis[2,4-diamino-6-(2-pyridyl)-1,3,5-triazine-κ2N1,N6]zinc(II)". Acta Crystallographica Section E Structure Reports Online 65, № 6 (7 травня 2009): m622. http://dx.doi.org/10.1107/s1600536809016055.

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Анотація:

In the title mononuclear complex, [Zn(N3)2(C8H8N6)2], the ZnIIatom, lying on a twofold rotation axis, is six-coordinated in a distorted octahedral environment by four N atoms from two 2,4-diamino-6-(2-pyridyl)-1,3,5-triazine ligands and two N atoms from two end-on-coordinated azide ions. N—H...N hydrogen bonds between the ligand and azide ion link the complex molecules into a three-dimensional network.

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Xie, Long-Yan, Yu Zhang, Hao Xu, Chang-Da Gong, Xiu-Li Du, Yang Li, Meng Wang, and Jie Qin. "Synthesis, structure and bioactivity of Ni2+ and Cu2+ acylhydrazone complexes." Acta Crystallographica Section C Structural Chemistry 75, no. 7 (June 14, 2019): 927–34. http://dx.doi.org/10.1107/s2053229619008040.

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Two acylhydrazone complexes, bis{6-methyl-N′-[1-(pyrazin-2-yl-κN 1)ethylidene]nicotinohydrazidato-κ2 N′,O}nickel(II), [Ni(C13H12N5O)2], (I), and di-μ-azido-κ4 N 1:N 1-bis({6-methyl-N′-[1-(pyrazin-2-yl-κN 1)ethylidene]nicotinohydrazidato-κ2 N′,O}nickel(II)), [Cu2(C13H12N5O)2(N3)2], (II), derived from 6-methyl-N′-[1-(pyrazin-2-yl)ethylidene]nicotinohydrazide (HL) and azide salts, have been synthesized. HL acts as an N,N′,O-tridentate ligand in both complexes. Complex (I) crystallizes in the orthorhombic space group Pbcn and has a mononuclear structure, the azide co-ligand is not involved in crystallization and the Ni2+ centre lies in a distorted {N4O2} octahedral coordination environment. Complex (II) crystallizes in the triclinic space group P\overline{1} and is a centrosymmetric binuclear complex with a crystallographically independent Cu2+ centre coordinating to three donor atoms from the deprotonated L − ligand and to two N atoms belonging to two bridging azide anions. The two- and one-dimensional supramolecular structures are constructed by hydrogen-bonding interactions in (I) and (II), respectively. The in vitro urease inhibitory evaluation revealed that complex (II) showed a better inhibitory activity, with the IC50 value being 1.32±0.4 µM. Both complexes can effectively bind to bovine serum albumin (BSA) by 1:1 binding, which was assessed via tryptophan emission–quenching measurements. The bioactivities of the two complexes towards jack bean urease were also studied by molecular docking. The effects of the metal ions and the coordination environments in the two complexes on in vitro urease inhibitory activity are preliminarily discussed.

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Qian, Kun, Yan-hong Yu, Yao-Hui Ye, and Hao Fan. "Synthesis, crystal structure and magnetic properties of the complex [C(NH2)3]2[Mn(N3)4] with a polynuclear azido-bridged chain anion." Zeitschrift für Naturforschung B 72, no. 3 (March 1, 2017): 171–74. http://dx.doi.org/10.1515/znb-2016-0221.

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Abstract A new complex [C(NH2)3]2[Mn(N3)4], in which MnII cations are alternatively bridged by double EE azide-bridges and the [Mn(N3)4]n2− chains are separated by guanidinium cation bilayers, has been synthesized and characterized by single crystal X-ray diffraction, infrared (IR) spectroscopy, elemental analyses, and magnetic measurements. Magnetic susceptibility data indicate antiferromagnetic interaction among the MnII ions.

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Laachir, Abdelhakim, Fouad Bentiss, Salaheddine Guesmi, Mohamed Saadi та Lahcen El Ammari. "Crystal structure of bis(azido-κN)bis[2,5-bis(pyridin-2-yl)-1,3,4-thiadiazole-κ2N2,N3]nickel(II)". Acta Crystallographica Section E Crystallographic Communications 71, № 2 (14 січня 2015): m24—m25. http://dx.doi.org/10.1107/s2056989015000201.

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Reaction of 2,5-bis(pyridin-2-yl)-1,3,4-thiadiazole and sodium azide with nickel(II) triflate yielded the mononuclear title complex, [Ni(N3)2(C12H8N4S)2]. The NiIIion is located on a centre of symmetry and is octahedrally coordinated by four N atoms of the two bidentate heterocyclic ligands in the equatorial plane. The axial positions are occupied by the N atoms of two almost linear azide ions [N—N—N = 178.8 (2)°]. The thiadiazole and pyridine rings of the heterocyclic ligand are almost coplanar, with a maximum deviation from the mean plane of 0.0802 (9) Å. The cohesion of the crystal structure is ensured by π–π interactions between parallel pyridine rings of neighbouring molecules [centroid-to-centroid distance = 3.6413 (14) Å], leading to a layered arrangement of the molecules parallel to (001).

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Dahlous, Kholood A., Saied M. Soliman, Ayman El-Faham, and Raghdaa A. Massoud. "Synthesis, Molecular and Supramolecular Structures of Symmetric Dinuclear Cd(II) Azido Complex with bis-Pyrazolyl s-Triazine Pincer Ligand." Symmetry 14, no. 11 (November 14, 2022): 2409. http://dx.doi.org/10.3390/sym14112409.

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A new dinuclear Cd(II)-azido complex of 2,4-bis(3,5-dimethyl-1H-pyrazol-1-yl)-6-methoxy-1,3,5-triazine (PMT) pincer ligand is synthesized. Its single crystal X-ray structure reveals the dinuclear [Cd(PMT)(Cl)(N3)]2 formula. The triclinic crystal parameters are a = 9.323(4) Å, b = 10.936(5) Å, c = 11.312(6) Å, α = 112.637(10)°, β = 104.547(11)° and γ = 105.133(10)° while V = 944.1(8) Å3. Due to symmetry considerations, the asymmetric unit comprises a half [Cd(PMT)(Cl)(N3)]2 formula. The Cd(II) is hexa-coordinated with one tridentate PMT ligand in a pincer fashion mode in addition to one terminal chloride and two azide ions bridging the two Cd(II) centers in double μ(1,1) bridging mode. Unusually, the Cd-N(s-triazine) bond is not the shortest among the Cd-N interactions with the PMT pincer ligand. The supramolecular structure of the dinuclear [Cd(PMT)(Cl)(N3)]2 formula is controlled by a significant amount of Cl…H (16.4%), N…H (25.3%), H…C (9.8%) and H…H (37.2%) interactions based on Hirshfeld surface analysis. Careful inspection of the shape index map reveals the presence of some weak π-π stacking interactions between the s-triazine and pyrazolyl moieties. The percentage of C…C contacts is 1.9% where the C2…C8 (3.462 Å) is the shortest while the centroid–centroid distance is 3.686 Å. Natural charge analysis describes the charge transferences from the ligand groups to the Cd(II), while and atoms in molecules (AIM) give an indication on the properties of the Cd-N and Cd-Cl bonds.

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Keskic, Tanja, Dusanka Radanovic, Andrej Pevec, Iztok Turel, Maja Gruden, Katarina Andjelkovic, Dragana Mitic, Matija Zlatar, and Bozidar Cobeljic. "Synthesis, X-ray structure and DFT calculation of magnetic properties of binuclear Ni(II) complex with tridentate hydrazone-based ligand." Journal of the Serbian Chemical Society 85, no. 10 (2020): 1279–90. http://dx.doi.org/10.2298/jsc200625038k.

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Abstract: Binuclear double end-on azido bridged Ni(II) complex (1) with composition [Ni2L2(?-1,1-N3)2(N3)2]?6H2O, (L = (E)-N,N,N-trimethyl-2-oxo-2-(2- -(1-(pyridin-2-yl)ethylidene)hydrazinyl)ethan-1-amin) was synthesized and characterized by single-crystal X-ray diffraction method. Ni(II) ions are hexacoordinated with the tridentate heteroaromatic hydrazone-based ligand and three azido ligands (one terminal and two are end-on bridges). DFT calculations revealed that coupling between two Ni(II) centers is ferromagnetic in agreement with binuclear Ni(II) complexes with similar structures.

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Liu, Bao Lin, Yan Xia Wang, and Ruo Jie Tao. "Two New Copper (II) Complexes with the Same NNO Donor Schiff Base Ligand: A Monomer and a Dimer." Zeitschrift für Naturforschung B 67, no. 3 (March 1, 2012): 192–96. http://dx.doi.org/10.1515/znb-2012-0302.

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Two new copper(II) complexes, [(CuL)2(μ1,1-N3)2]・2H2O (1) and [Cu(HL)(2,2ʹ-bipy)- (CH3COO)]・ClO4・H2O (2), have been synthesized using the tridentate NNO Schiffbase ligand 2- [(2-aminoethylimino)methyl]-6-methoxyphenol (HL). They have been characterized by elemental analysis, IR spectroscopy, thermal analysis, and single-crystal X-ray analysis. The copper environment is distorted square pyramidal in complex 1: two nitrogen atoms and one oxygen atom from the ligands and two nitrogen atoms from two azido ligands build the coordination polyhedron around the copper atom. The Cu-Nazide-Cu angle in complex 1 is 85.6°. This is unusually small in comparison with the same angle in other end-on doubly azido-bridged dimers. Complex 2 is mononuclear with the Cu atom having a slightly distorted octahedral geometry. Magnetic measurements of 1 have been performed in the temperature range from 2 to 300 K. The experimental data indicate an antiferromagnetic exchange interaction between copper(II) ions bridged by the azido ligand. The best-fit parameters for complex 1 are g = 2.18 and J = −1.31 cm−1.

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Pastor Ramírez, Cándida, Sylvain Bernès, Samuel Hernández Anzaldo та Yasmi Reyes Ortega. "Structure and NMR properties of the dinuclear complex di-μ-azido-κ4 N 1:N 1-bis[(azido-κN)(pyridine-2-carboxamide-κ2 N 1,O)zinc(II)]". Acta Crystallographica Section E Crystallographic Communications 77, № 2 (8 січня 2021): 111–16. http://dx.doi.org/10.1107/s2056989020016680.

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Анотація:

The new diamagnetic complex, [Zn2(N3)4(C6H6N2O)2] or [Zn2(pca)2(μ1,1-N3)2(N3)2] was synthesized using pyridine-2-carboxamide (pca) and azido ligands, and characterized using various techniques: IR spectroscopy and single-crystal X-ray diffraction in the solid state, and nuclear magnetic resonance (NMR) in solution. The molecule is placed on an inversion centre in space group P\overline{1}. The pca ligand chelates the metal centre via the pyridine N atom and the carbonyl O atom. One azido ligand bridges the two symmetry-related Zn2+ cations in the end-on coordination mode, while the other independent azido anion occupies the fifth coordination site, as a terminal ligand. The resulting five-coordinate Zn centres have a coordination geometry intermediate between trigonal bipyramidal and square pyramidal. The behaviour of the title complex in DMSO solution suggests that it is a suitable NMR probe for similar or isostructural complexes including other transition-metal ions. The diamagnetic nature of the complex is reflected in similar 1H and 13C NMR chemical shifts for the free ligand pca as for the Zn complex.

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Більше джерел

Дисертації з теми "Azides; Complex ions"

Navrátil, Rafael. "Fotodisociační studie xanthenových barviv, železitých azido komplexů a hemithioindigových molekulových přepínačů v plynné fázi." Doctoral thesis, 2019. http://www.nusl.cz/ntk/nusl-409256.

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Electronic excitation triggered by the absorption of light enables numerous chemical, physical and biological processes and transformations. Accordingly, full control over the processes involving excited molecules requires an in-depth knowledge of electronic UV/vis spectra and potential energy surfaces. Unsurprisingly, most electronic spectra are acquired in the condensed phase in which molecules are dissolved and most transformations occur. However, our knowledge of excitation, transformations and processes at the level of isolated molecules is still limited, partly because such studies require unconventional experimental approaches and equipment. This Thesis describes experimental methods for recording electronic spectra of isolated molecules in the gas phase by ion spectroscopy, which combines mass spectrometry with optical spectroscopy. Using these methods, experimental factors which affect the electronic excitation and therefore the electronic spectra of ions were determined and evaluated for various fluorescent xanthene dyes, iron-containing complexes and molecular pho- toswitches. Furthermore, factors which govern photochemical processes, such as photo- oxidation, photoreduction and photoisomerization, were also analyzed in detail, with surprisingly different outcomes from previous studies...

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