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Статті в журналах з теми "Helicity - Coordination Chemistry"

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Автор: Grafiati

Опубліковано: 7 вересня 2023

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1

Miyake, Hiroyuki, and Hiroshi Tsukube. "Helix Architecture and Helicity Switching via Dynamic Metal Coordination Chemistry." Supramolecular Chemistry 17, no. 1-2 (January 1, 2005): 53–59. http://dx.doi.org/10.1080/10610270412331328790.

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2

Qiu, Gege, Cédric Colomban, Nicolas Vanthuyne, Michel Giorgi, and Alexandre Martinez. "Chirality transfer in a cage controls the clockwise/anticlockwise propeller arrangement of the tris(2-pyridylmethyl)amine ligand." Chemical Communications 55, no. 94 (2019): 14158–61. http://dx.doi.org/10.1039/c9cc07244f.

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Анотація:

A predictable control of the propeller arrangement of the tris(2-pyridylmethyl)amine (TPA) ligand was achieved in the smallest hemicryptophane 1. Coordination of Cu(i) result in a rare T-shaped complex with controlled helicity of the TPA-Cu core.

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3

Saalfrank, Rolf W., Michael Decker, Frank Hampel, Karl Peters, and Hans Georg von Schnering. "Coordination Polymers, 13. Induction of Helicity via Stereogenic Centers: Asymmetric Synthesis of (P)- and (M)-Coordination Polymers." Chemische Berichte 130, no. 9 (September 1997): 1309–13. http://dx.doi.org/10.1002/cber.19971300921.

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4

Yang, Jun-Wei, Jing Zhang, Yan Yan, Xiao-Chun Huang, and Shan-Ling Tong. "A coordination polymer of manganese (III) porphyrinate with right-handed helicity and opticity." Solid State Sciences 12, no. 7 (July 2010): 1242–47. http://dx.doi.org/10.1016/j.solidstatesciences.2010.03.003.

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5

Neogi, Subhadip, Manish K. Sharma, Madhab C. Das, and Parimal K. Bharadwaj. "Helicity-induced two-layered Cd(II) coordination polymers built with different kinked dicarboxylates and an organodiimidazole." Polyhedron 28, no. 18 (December 2009): 3923–28. http://dx.doi.org/10.1016/j.poly.2009.09.005.

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6

Nabeshima, Tatsuya, and Masaki Yamamura. "Cooperative formation and functions of multimetal supramolecular systems." Pure and Applied Chemistry 85, no. 4 (January 1, 2013): 763–76. http://dx.doi.org/10.1351/pac-con-12-08-02.

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Анотація:

Multimetal complexes provide a variety of interesting structures, unique properties, and functions. Such sophisticated functions are often produced by synergistic and cooperative interactions among the metal ions accumulated in the restricted small area of the multimetal systems. We describe novel three strategies (i.e., macrocyclic, C-shape, and multimetal template) for the preparation of the multimetal supramolecular systems by the cooperative metal binding of a multi-Schiff-base and multi-oxime ligands, and their characteristic structures and functions. The three approaches are versatile and effective because the employed coordination reactions smoothly and quickly proceeded under mild conditions to quantitatively form the desired coordination structures. The multimetal supramolecular systems obtained here exhibit the synergistic and cooperative functions for ion recognition, magnetic properties, helicity control, and modulation of reaction selectivity. These types of multimetal complexes could be developed for a cascade functional supramolecular system that shows highly synergistic properties, integrated multifunctions, and function amplification.

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7

Sairenji, Shiho, Shigehisa Akine, and Tatsuya Nabeshima. "Dynamic helicity control of single-helical oligooxime metal complexes by coordination of chiral carboxylate ions." Tetrahedron Letters 55, no. 12 (March 2014): 1987–90. http://dx.doi.org/10.1016/j.tetlet.2014.02.009.

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8

Perić, Berislav, Zoran Kokan та Srećko I. Kirin. "Induction of Λ-helicity in a zinc complex with an alanine-appended aminopyridine ligand". Acta Crystallographica Section C Structural Chemistry 77, № 8 (5 липня 2021): 449–57. http://dx.doi.org/10.1107/s2053229621006471.

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The crystal structure of tris[dimethyl 5-({1-[(pyridin-2-yl-κN)carbamoyl-κO]ethyl}carbamoyl)benzene-1,3-dicarboxylate]zinc(II) dinitrate acetonitrile trisolvate, [Zn(C19H19N3O6)3](NO3)2·3CH3CN or [Zn(L)3](NO3)2·3CH3CN, (1), has been determined by single-crystal X-ray diffraction. The neutral ligand L coordinates to the Zn2+ cation in a bidentate fashion via the pyridine N atom and an amide O atom, forming a six-membered chelate ring. The Λ-helical chirality of the Zn2+ coordination sphere is induced by pendant L-alanine residues through stacking interactions between the arene groups of two coordinated ligands, assisted by a hydrogen bond between amide groups bonded to the stacked arene rings. The third ligand is coordinated to the Zn2+ cation by the same six-membered chelate ring, but in the opposite direction with respect to the analogous chelate rings of the first two coordinated ligands. Besides ionic interactions between [ZnL 3]2+ complexes and NO3 − anions, several types of hydrogen bonds and intermolecular stacking interactions contribute to the stability of the solid-state phase.

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9

Takashima, Shunsuke, Hajime Abe, and Masahiko Inouye. "Copper(ii)-mediated chiral helicity amplification and inversion of meta-ethynylpyridine polymers with metal coordination sites." Chemical Communications 47, no. 26 (2011): 7455. http://dx.doi.org/10.1039/c1cc12358k.

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10

Ikeda, Masato, Yoshie Tanaka, Takashi Hasegawa, Yoshio Furusho, and Eiji Yashima. "Construction of Double-Stranded Metallosupramolecular Polymers with a Controlled Helicity by Combination of Salt Bridges and Metal Coordination." Journal of the American Chemical Society 128, no. 21 (May 2006): 6806–7. http://dx.doi.org/10.1021/ja0619096.

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11

Miyake, Hiroyuki, Masahiro Hikita, Masumi Itazaki, Hiroshi Nakazawa, Hideki Sugimoto, and Hiroshi Tsukube. "A Chemical Device That Exhibits Dual Mode Motions: Dynamic Coupling of Amide Coordination Isomerism and Metal-Centered Helicity Inversion in a Chiral Cobalt(II) Complex." Chemistry - A European Journal 14, no. 18 (June 20, 2008): 5393–96. http://dx.doi.org/10.1002/chem.200800625.

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12

Seidel, Falk W., Sibylle Frieß, Frank W. Heinemann, Ahmed Chelouan, Andreas Scheurer, Alexander Grasruck, Alberto Herrera, and Romano Dorta. "C2-Symmetric (SO)N(SO) Sulfoxide Pincer Complexes of Mg and Pd: Helicity Switch by Ambidentate S/O-Coordination and Isolation of a Chiral Pd-Sulfenate." Organometallics 37, no. 7 (March 19, 2018): 1160–71. http://dx.doi.org/10.1021/acs.organomet.8b00038.

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13

Albrecht, Markus, Matthias Schneider, and Herbert Röttele. "Dynamic Behavior of Anionic Binuclear Helicate- andmeso-Helicate-Type Coordination Compounds." Chemische Berichte 130, no. 5 (May 1997): 615–19. http://dx.doi.org/10.1002/cber.19971300512.

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14

Han, Lei, Daqiang Yuan, Yanqing Xu, Mingyan Wu, Yaqiong Gong, Benlai Wu, and Maochun Hong. "A luminescent polymeric silver(I) coordination tubular helicate." Inorganic Chemistry Communications 8, no. 6 (June 2005): 529–32. http://dx.doi.org/10.1016/j.inoche.2005.03.001.

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15

Simosono, Cintia A., Rafaela M. R. da Silva, Nathália R. De Campos, Marye Agnes R. Silva, Antônio C. Doriguetto, Leonã S. Flores, Charlane C. Correa, et al. "Study of the Counter Cation Effects on the Supramolecular Structure and Electronic Properties of a Dianionic Oxamate-Based {NiII2} Helicate." Molecules 28, no. 5 (February 23, 2023): 2086. http://dx.doi.org/10.3390/molecules28052086.

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Анотація:

Herein, we describe the synthesis, crystal structure, and electronic properties of {[K2(dmso)(H2O)5][Ni2(H2mpba)3]·dmso·2H2O}n (1) and [Ni(H2O)6][Ni2(H2mpba)3]·3CH3OH·4H2O (2) [dmso = dimethyl sulfoxide; CH3OH = methanol; and H4mpba = 1,3-phenylenebis(oxamic acid)] bearing the [Ni2(H2mpba)3]2− helicate, hereafter referred to as {NiII2}. SHAPE software calculations indicate that the coordination geometry of all the NiII atoms in 1 and 2 is a distorted octahedron (Oh) whereas the coordination environments for K1 and K2 atoms in 1 are Snub disphenoid J84 (D2d) and distorted octahedron (Oh), respectively. The {NiII2} helicate in 1 is connected by K+ counter cations yielding a 2D coordination network with sql topology. In contrast to 1, the electroneutrality of the triple-stranded [Ni2(H2mpba)3] 2− dinuclear motif in 2 is achieved by a [Ni(H2O)6]2+ complex cation, where the three neighboring {NiII2} units interact in a supramolecular fashion through four R22(10) homosynthons yielding a 2D array. Voltammetric measurements reveal that both compounds are redox active (with the NiII/NiI pair being mediated by OH– ions) but with differences in formal potentials that reflect changes in the energy levels of molecular orbitals. The NiII ions from the helicate and the counter-ion (complex cation) in 2 can be reversibly reduced, resulting in the highest faradaic current intensities. The redox reactions in 1 also occur in an alkaline medium but at higher formal potentials. The connection of the helicate with the K+ counter cation has an impact on the energy levels of the molecular orbitals; this experimental behavior was further supported by X-ray absorption near-edge spectroscopy (XANES) experiments and computational calculations.

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16

Fazio, Ettore, M. Jesús Vicente-Arana, M. Teresa Alonso, Tomás Torres, and Gema de la Torre. "Selective guest recognition by a metallo-organic phthalocyanine-based host." Journal of Porphyrins and Phthalocyanines 23, no. 11n12 (December 2019): 1570–75. http://dx.doi.org/10.1142/s1088424619501712.

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In this manuscript, we have studied the selectivity in the complexation of fullerene species by a Fe[Formula: see text]Pc[Formula: see text] metallo-organic helicate (1) assembled using a bidentate phthalocyanine (Pc) as ligand. The large aromatic internal surface of this helicate shows a strong selectivity towards the encapsulation of C[Formula: see text] from a mixture of C[Formula: see text] and C[Formula: see text]. On the other hand, a bisimidazole-containing naphthalenediimide was used to perform guest exchange experiments over [fullerene [Formula: see text] 1] complexes, taking advantage of the strong coordination bond of the imidazole ring to the Zn centers in the Pc cavity.

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17

Capel Berdiell, Izar, Stuart L. Warriner, and Malcolm A. Halcrow. "Silver(i) complexes of bis- and tris-(pyrazolyl)azine derivatives – dimers, coordination polymers and a pentametallic assembly." Dalton Transactions 47, no. 15 (2018): 5269–78. http://dx.doi.org/10.1039/c8dt00640g.

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Two solvatomorphs of [Ag(tpt)]BF₄·nMeNO₂(tpt = 2,4,6-tri{pyrazol-1-yl}pyridine) form face-to-face dimers linked by bridging pyrazolyl donors (left), or an unsupported chain-of-helicate dimers (right). Other assemblies supported by related heterocyclic ligands are also described.

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18

Ghosh, Sujit K., and Parimal K. Bharadwaj. "Self-Assembly of Lanthanide Helicate Coordination Polymers into 3D Metal-Organic Framework Structures." Inorganic Chemistry 43, no. 7 (April 2004): 2293–98. http://dx.doi.org/10.1021/ic034982v.

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19

Sumby, Christopher J., Ben A. Leita, Boujemaa Moubaraki, Keith S. Murray, and Peter J. Steel. "Synthesis and Coordination Chemistry of Doubly-Tridentate Tripodal Pyridazine and Pyrimidine-Derived Ligands: Structural Interplay Between M2L and M2L2 (M = Ni and Pd) Complexes and Magnetic Properties of Iron(II) Complexes." Australian Journal of Chemistry 62, no. 9 (2009): 1142. http://dx.doi.org/10.1071/ch09244.

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Анотація:

The coordination chemistry of three bridging doubly-tridentate ligands, including the known compound 3,6-bis(di-2-pyridylmethyl)pyridazine (1), which is structurally similar to 1,4-bis(di-2-pyridylmethyl)phthalazine (2), and two pyrimidine-linked compounds 4,6-bis(di-2-pyridylmethyl)pyrimidine (3), and 4,6-bis(di-2-pyridylamino)pyrimidine (4), was investigated with FeII, NiII, and PdII metal salts. Ligands 3 and 4 were synthesized in one-pot reactions from easily obtained starting materials; compound 3 was synthesized from di-2-pyridylmethane and 4,6-diiodopyrimidine in 48% yield, while ligand 4 was prepared by reacting di-2-pyridylamine with 4,6-dichloropyrimidine in 27% yield. During the synthesis of 4, an additional compound, 4-chloro-6-(di-2-pyridylamino)pyrimidine (5), with only one tridentate binding site was obtained in 30% yield. Reactions of 1, 3, and 4 with FeII or NiII salts gave two types of complexes, either discrete M2L or M2L2 assemblies. The PdII complexes obtained were also characterized as discrete M2L complexes. The compounds were characterized by a combination of NMR and IR spectroscopy, microanalysis and X-ray crystallography. Noticeable differences in the structures obtained for NiII coordination complexes with the carbon-linked (3) and nitrogen-linked (4) ligands were observed, whereby the nitrogen linker adopted a trigonal planar geometry and prevented tridentate facial coordination of the octahedral metal centres. The magnetic properties of dinuclear FeII complexes of 1 were examined to see if they showed spin-crossover effects, a feature recently observed by others in other dinuclear helicate complexes, but the complexes remained high-spin at all temperatures between 300 and 2 K.

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20

Argent, Stephen P., Fiona C. Jackson, Ho Man Chan, Sam Meyrick, Christopher G. P. Taylor, Tanya K. Ronson, Jonathan P. Rourke, and Michael D. Ward. "A family of diastereomeric dodecanuclear coordination cages based on inversion of chirality of individual triangular cyclic helicate faces." Chemical Science 11, no. 37 (2020): 10167–74. http://dx.doi.org/10.1039/d0sc04347h.

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All three diastereoisomers of a cuboctahedral coordination cage containing square and triangular faces, based on different chirality of each triangular face independently, have been structurally characterised.

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21

Liu, Huan, Hong Zhou, Zhi-Quan Pan, Dan Hu, Qi-Mao Huang, Han-Ping Zhang, Xue-Lei Hu, and Xiang-Gao Meng. "A self-assembled pentanuclear single-stranded helicate based on the square-planar coordination geometries." Inorganic Chemistry Communications 10, no. 7 (July 2007): 805–7. http://dx.doi.org/10.1016/j.inoche.2007.04.002.

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22

Constable, Edwin C., Nik Hostettler, Catherine E. Housecroft, Niamh S. Murray, Jonas Schönle, Umut Soydaner, Roché M. Walliser, and Jennifer A. Zampese. "Monomer, dimer or cyclic helicate? Coordination diversity with hard–soft P,N-donor ligands." Dalton Transactions 42, no. 14 (2013): 4970. http://dx.doi.org/10.1039/c3dt32560a.

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23

Isola, Mauro, Vincenzo Liuzzo, Fabio Marchetti, and Andrea Raffaelli. "A Self-Assembled Dinuclear Double-Stranded Helicate Based on a Square-Planar Coordination Geometry." European Journal of Inorganic Chemistry 2002, no. 7 (July 2002): 1588–90. http://dx.doi.org/10.1002/1099-0682(200207)2002:7<1588::aid-ejic1588>3.0.co;2-q.

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24

Albrecht, Markus, and Sirpa Kotila. "Stabilization of an Unusual Coordination Geometry at Li+ in the Interior of a Cryptand-Type Helicate." Angewandte Chemie International Edition in English 35, no. 11 (June 17, 1996): 1208–10. http://dx.doi.org/10.1002/anie.199612081.

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25

Paital, Alok Ranjan, Prasant Kumar Nanda, Sunirban Das, Guillem Aromí, and Debashis Ray. "Unique Asymmetric (CuII4) Double-Stranded Helicate from a Hexadentate Piperazine-Based Ligand: Ligand Conformation Isomerism upon Coordination." Inorganic Chemistry 45, no. 2 (January 2006): 505–7. http://dx.doi.org/10.1021/ic051455y.

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26

Bučar, Dejan-Krešimir, Giannis S. Papaefstathiou, Tamara D. Hamilton, and Leonard R. MacGillivray. "A lanthanide-based helicate coordination polymer derived from a rigid monodentate organic bridge synthesized in the solid state." New Journal of Chemistry 32, no. 5 (2008): 797. http://dx.doi.org/10.1039/b800878g.

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27

Purohit, Chandra Shekhar, та Sandeep Verma. "Patterned Deposition of a Mixed-Coordination Adenine−Silver Helicate, Containing a π-Stacked Metallacycle, on a Graphite Surface". Journal of the American Chemical Society 129, № 12 (березень 2007): 3488–89. http://dx.doi.org/10.1021/ja068892b.

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28

Barbul, Ioana, Richard A. Varga, and Cristian Silvestru. "Structural Diversity of Coordination Cores in Homoleptic Tetraaryltin(IV) Dioxolane, Aldehyde and Imines: The First Octacoordinated Double Helicate Tetraorganotin(IV) Compound." European Journal of Inorganic Chemistry 2013, no. 18 (April 9, 2013): 3146–54. http://dx.doi.org/10.1002/ejic.201300245.

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29

Barbul, Ioana, Richard A. Varga, and Cristian Silvestru. "Structural Diversity of Coordination Cores in Homoleptic Tetraaryltin(IV) Dioxolane, Aldehyde and Imines: The First Octacoordinated Double Helicate Tetraorganotin(IV) Compound." European Journal of Inorganic Chemistry 2013, no. 18 (June 12, 2013): 3120. http://dx.doi.org/10.1002/ejic.201300437.

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30

Tominaga, Masahide, Hyuma Masu, Kentaro Yamaguchi, and Isao Azumaya. "Construction and Structural Investigation of Helical Coordination Network Formed by the Self-assembly of Triple Helicate with Macrocyclic Framework and Lanthanum Cations." Chemistry Letters 35, no. 7 (July 2006): 718–19. http://dx.doi.org/10.1246/cl.2006.718.

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31

Sailaja, S., and M. V. Rajasekharan. "Synthesis and Structure of Coordination Polymers of Ag(I) with Isomeric (Aminomethyl)pyridines. Formation of A Novel Circular Helicate and 2-D Networks via Ag···Ag Contacts and Coordination Shell Expansion under Anion Control." Inorganic Chemistry 42, no. 18 (September 2003): 5675–84. http://dx.doi.org/10.1021/ic0342292.

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32

Bahojb Noruzi, Ehsan, Behrouz Shaabani, Silvano Geremia, Neal Hickey, Patrizia Nitti, and Hossein Samadi Kafil. "Synthesis, Crystal Structure, and Biological Activity of a Multidentate Calix[4]arene Ligand Doubly Functionalized by 2-Hydroxybenzeledene-Thiosemicarbazone." Molecules 25, no. 2 (January 16, 2020): 370. http://dx.doi.org/10.3390/molecules25020370.

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The design and synthesis of a novel tert-butyl-calix[4]arene functionalized at 1, 3 positions of the lower rim with two terminal 2-hydroxybenzeledene-thiosemicarbazone moieties is reported. The new ligand with multi-dentate chelating properties was fully characterized by several techniques: ESI-Mass spectroscopy, FT-IR, 1H-NMR, and single crystal X-ray diffraction. The solid state structure confirms that the calix[4]arene macrocycle has the expected open cone conformation, with two opposite phenyl rings inclined outwards with large angles. The conformation of the two alkoxythiosemicarbazone arms produces a molecule with a C2 point group symmetry. An interesting chiral helicity is observed, with the two thiosemicarbazone groups oriented in opposite directions like a two-blade propeller. A water molecule is encapsulated in the center of the two-blade propeller through multiple H-bond coordinations. The antibacterial, antifungal, anticancer, and cytotoxic activities of the calix[4]arene-thiosemicarbazone ligand and its metal derivatives (Co2+, Ni2+, Cu2+, and Zn2+) were investigated. A considerable antibacterial activity (in particular against E. coli, MIC, and MBC = 31.25 μg/mL) was observed for the ligand and its metal derivatives. Significant antifungal activities against yeast (C. albicans) were also observed for the ligand (MIC = 31.25 μg/mL and MBC = 125 μg/mL) and for its Co2+ derivative (MIC = 62.5 μg/mL). All compounds show cytotoxicity against the tested cancerous cells. For the Saos-2 cell line, the promising anticancer activity of ligand L (IC50 < 25 μg/mL) is higher than its metal derivatives. The microscopic analysis of DAPI-stained cells shows that the treated cells change in morphology, with deformation and fragmentation of the nuclei. The hemo-compatibility study demonstrated that this class of compounds are suitable candidates for further in vivo investigations.

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33

Barbul, Ioana, Richard A. Varga, and Cristian Silvestru. "Structural Diversity of Coordination Cores in Homoleptic Tetraaryltin(IV) Dioxolane, Aldehyde and Imines: The First Octacoordinated Double Helicate Tetraorganotin(IV) Compound (Eur. J. Inorg. Chem. 18/2013)." European Journal of Inorganic Chemistry 2013, no. 18 (June 12, 2013): n/a. http://dx.doi.org/10.1002/ejic.201390078.

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34

Shakir, Mohammad, Shama Parveen, Poonam Chingsubam, Katsuyuki Aoki, Shahper N Khan, and Asad U Khan. "Cation supported self-assembly of coordination polymers, [(H2en)(ntpMCl2)]n (M=ZnII, CdII, HgII) involving the tripodal acid, ntp: X-ray crystal structure and DNA binding studies on zinc helicate." Polyhedron 25, no. 15 (November 2006): 2929–34. http://dx.doi.org/10.1016/j.poly.2006.04.023.

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35

Couchman, Samantha M., John C. Jeffery, and Michael D. Ward. "Synthesis and coordination chemistry of the tetradentate ligands 6,6′-bis(3-pyrazolyl)-2,2′-bipyridine and 6,6′-bis(2-hydroxyphenyl)-2,2′-bipyridine: intramolecular hydrogen-bonding in complexes of Cu(II), and a dinuclear double helicate with Ag(I)." Polyhedron 18, no. 20 (August 1999): 2633–40. http://dx.doi.org/10.1016/s0277-5387(99)00154-0.

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36

Amendola, Valeria, Massimo Boiocchi, Yuri Diaz Fernandez, Carlo Mangano, and Piersandro Pallavicini. "A Solvent-Dependent and Electrochemically Controlled Self-Assembling/Disassembling System." Collection of Czechoslovak Chemical Communications 68, no. 9 (2003): 1647–62. http://dx.doi.org/10.1135/cccc20031647.

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The bis-bidentate ligand R,S-1,2-diphenyl-N,N'-bis(2-quinolinemethylidene)ethane-1,2-diamine (ligand 4), containing two (iminomethyl)quinoline moieties separated by a cis-1,2-diphenylethylene spacer, forms stable complexes with both CuI and CuII. With CuII, the monomeric 1:1 complex [CuII(4)]2+ is obtained both in CH3CN and CH2Cl2. With CuI and overall 1:1 metal/ligand molar ratio, an equilibrium mixture is obtained in CH3CN, consisting of [CuI(4)2]+, [CuI2(4)2]2+ and [CuI2(4)(CH3CN)4]2+. The preponderant species is the two-metal one-ligand "open" complex [CuI2(4)(CH3CN)4]2+, in which each Cu+ cation is coordinated in a tetrahedral fashion by one (iminomethyl)quinoline unit and by two CH3CN molecules. Precipitation from the equilibrium mixture yields only crystals of [CuI2(4)(CH3CN)4](ClO4)2·2CH3CN, whose crystal and molecular structures have been determined. On the other hand, in the poorly coordinating CH2Cl2 solvent, only the dimeric helical [CuI2(4)2]2+ complex is obtained, when the overall metal/ligand 1:1 molar ratio is chosen. Addition of large quantities of acetonitrile to solutions of [CuI2(4)2]2+ in dichlorometane results in the formation of [CuI2(4)(CH3CN)4]2+, i.e. in the solvent-driven disassembling of the CuI helicate. While electrochemistry in CH3CN is poorly defined due to the presence of more than one CuI species, cyclic voltammetry experiments carried out in CH2Cl2 revealed a well defined behavior, with irreversible oxidation of [CuI2(4)2]2+ and irreversible reduction of [CuII(4)]2+ taking place at separate potentials (∆E ≈ 700 mV). Irreversibility and separation of the redox events are due to the self-assembling and disassembling processes following the reduction and oxidation, respectively.

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Houlton, Andrew, Osama El-Zubir, Pablo Rojas Martinez, Gema Dura, thomas pope, Thomas James Penfold, Lewis Mackenzie, et al. "Circularly polarised luminescence in an RNA-based homochiral, self-repairing, coordination polymer hydrogel." Journal of Materials Chemistry C, 2022. http://dx.doi.org/10.1039/d2tc00366j.

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The aqueous equimolar reaction of Ag(I) ions with the thionucleoside enantiomer (-)6-thioguanosine, ((-)6tGH), yields a one-dimensional coordination polymer {Ag(-)tG}n, the self-assembly of which generates left-handed helical chains. The resulting helicity...

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38

Albrecht, Markus, Olga Osetska, Thomas Abel, Gebhard Haberhauer, and Eva Ziegler. "An enantiomerically pure siderophore type ligand for the diastereoselective 1 : 1 complexation of lanthanide(III) ions." Beilstein Journal of Organic Chemistry 5 (December 11, 2009). http://dx.doi.org/10.3762/bjoc.5.78.

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A facile synthesis of a highly preorganized tripodal enterobactine-type ligand 1a-H3 consisting of a chiral C 3-symmetric macrocyclic peptide and three tridentate 2-amido-8-hydroxyquinoline coordinating units is presented. Complex formation with various metal ions (Al3+, Ga3+, Fe3+, La3+ and Eu3+) was investigated by spectrophotometric methods. Only in the case of La3+ and Eu3+ were well defined 1 : 1 complexes formed. On the basis of CD spectroscopy and DFT calculations the configuration at the metal centre of the La3+ complex was determined to show Λ helicity. The coordination compounds [(1a)Ln] presented should be prototypes for further lanthanide(III) complexes with an enterobactine analogue binding situation.

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39

Barrios, Leoní A., Rosa Diego, Mohanad Darawsheh, Jesús I. Martínez, Oliver Roubeau, and Guillem Aromí. "A ferric guest inside a spin crossover ferrous helicate." Chemical Communications, 2022. http://dx.doi.org/10.1039/d2cc00928e.

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40

Yim, King-Him, Chi-Tung Yeung, Michael R. Probert, Wesley Ting Kwok Chan, Lewis E. Mackenzie, Robert Pal, Wing-Tak Wong, and Ga-Lai Law. "Helicate-to-tetrahedron transformation of chiral lanthanide supramolecular complexes induced by ionic radii effect and linker length." Communications Chemistry 4, no. 1 (August 5, 2021). http://dx.doi.org/10.1038/s42004-021-00553-8.

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AbstractControlled formation of desired lanthanide supramolecular complexes is challenging because of the difficulties in predicting coordination geometry, as well as a labile coordination number. Herein, we explore the effect of ionic radii and linker length on supramolecular species formation. A helicate-to-tetrahedron transformation occurred between [Ln2L13] and [Ln4L16] (Ln = La, Sm, Eu, Gd, Tb and Lu). For six lanthanide ions, the unfavored tetrahedron [La4L16] can only be observed in a concentrated mixture with the helicate [La2L13] where no pure [La4L16] species was isolated via crystallization. For Sm, Eu, Gd, Tb, the [Ln4L16] supramolecular tetrahedron can be isolated via crystallization from diisopropyl ether. A similar result was also observed for Lu, but the tetrahedral structure was found to be relatively stable and transformed back to [Lu2L13] much slower upon dissolution. No tetrahedron formation was observed with L3 giving rise to only [Ln2L33] species, in which L3 contains a longer and more flexible linker compared with that of L1. Results show that the supramolecular transformation in these systems is governed by both the ionic radii as well as the ligand design. Special focus is on both [Eu2L13] and [Eu4L16] which form chiral entities and exhibit interesting circular polarized luminescence.

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41

Aromi, Guillem, Leoní Alejandra Barrios, Nuria Capó, Joan Cardona, Jordi Ribas-Ariño, Simon Teat, and Olivier Roubeau. "The template effect of a SiF62− guest drives the formation of a heteroleptic Fe(II) coordination helicate." Chemical Communications, 2022. http://dx.doi.org/10.1039/d2cc04559a.

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The anion SiF62− exerts a strong template effect, driving the exclusive assembly of two different bispyridylpyrazolyl ligands into a triple stranded Fe(II) dinuclear heteroleptic helicate, engendering a new class within...

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42

Li, Mei, Yanyan Zhou, Jingya Li, Wenru Huang, Zhiwei Yao, Yuying Li, Ting Gao, Pengfei Yan, and Hongfeng Li. "Circularly polarized luminescence switch based on a photochromic europium(III) helicate derived coordination polymer." Chinese Chemical Letters, July 2023, 108831. http://dx.doi.org/10.1016/j.cclet.2023.108831.

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43

BARRIOS MORENO, LEONI ALEJANDRA ALEJANDRA, Simon Teat, Olivier Roubeau, and Guillem Aromi. "A Supramolecular Helicate with Two Independent Fe(II) Switchable Centres and a [Fe(anilate)₃]³⁻ Guest." Chemical Communications, 2023. http://dx.doi.org/10.1039/d3cc02278a.

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A biphenyl-spaced bis-pyrazolylpyridine ligand interacts with ferrous ions to engender a dimetallic helical coordination cage that encapsulates an Fe3+ tris-anilate complex. The host-guest interaction breaks the symmetry of the Fe2+...

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44

"Toward Programmed Molecular Lanthanide Probes and Sensors." CHIMIA 50, no. 4 (April 24, 1996): 144. http://dx.doi.org/10.2533/chimia.1996.144.

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The peculiar spectroscopic properties of the lanthanide metal ions (4f-block, Lnlll), and particularly Eulll and Tblll, make them suitable for the design of chemical luminescent probes and analytical sensors when Lnlll is introduced into organized molecular architectures possessing controlled and protected coordination sites. The tridentate receptors 2,6-bis(1-alkylbenzimidazol-2-yl)pyridine (Li, i=2-7) play a crucial role since they react with Ln3+ to give mononuclear building blocks [Ln(Li)3]3+ where the metal ion is protected by the wrapping of the aromatic ligands. In these ultraviolet to visible light-converting devices (Ln=Eu, Tb), the size of the internal cavity is controlled by the three closely packed strands which produce i) a promising discrimination between Lnlll according to their sizes and ii) efficient light-harvesting resulting form the strong absoprtion of ultraviolet light by the ligands. These building blocks have been introduced into more sophisticated homodinuclear triple-helical complexes [Ln2(L8)3]6+ and statistical mixtures containing the heterodinuclear directional visible to visible light-converting device [EuTb(L8)3]6+. Improved molecular programming results form the use of acyclic segmental ligand possessing different binding units coded for one particular ion. The segmental ligands Li (i=9,10) discriminate Fell and AgI to give the heterodinuclear double helicate [FeAg(L10)2]3+ and the heterotrinuclear organometallic [2]-catenate [FeAg2(L9)2]4+ where each metal ion occupies a coordination site satisfying its stereochemical requirements. The receptor L11 recognizes 3d- and 4f-block metal ions to give the heterodinuclear d-f-triple-helical complexes [LnZn(L11)3]5+ where Znll occupies the pseudo-octahedral capping site and corresponds to a noncovalent tripod which properly organizes the strands for their coordination to Lnlll. In these new self-assembled lanthanide podates, predetermined structural and physical properties result form i) the judicious choice of the d-block ion associated with Lnlll and ii) the design of the tridentate unit bound to Lnlll. [LnFe(L11)3]5+ (Ln=La-Eu) display thermochromism and spin-crossover behavior while light emission can be increased by a factor 104 when going from [EuZn(L11)3]5+ to [EuZn(L12)3]5+. The design of tailored receptors for the preparation of stable lanthanide light-converting devices is discussed together with new characterization methods applied to complicated assembly processes in solution.

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