Transition metal liquid crystals: advanced materials within the reach of the coordination chemist

Espinet, Pablo; Esteruelas, Miguel A.; Oro, Luis A.; Serrano, José Luís; Sola, Eduardo

doi:10.1016/0010-8545(92)80025-m

Cited by 470 publications

(126 citation statements)

References 158 publications

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“…13 In addition, coordination of metal centers to the triphenylene core offers a versatile way to modify the properties of the system. 14,15,16,17 There are a few reports of liquid crystalline metal-organic triphenylene systems with covalently bonded Hg, 18 Cr 0 , 19 Zn II , 20 Cu II , Ni II , 21 Ag I , 22 and Pt II complexes. 23 Exploring the possibility to develop columnar materials in which columns of different natures coexist, we reported recently a family of mesomorphic mono and dinuclear ortho-metallated palladium complexes containing a columnar packing of triphenylene moieties that supports an associated stack of metal moieties.…”

Section: Introductionmentioning

confidence: 99%

Isocyano-Triphenylene Complexes of Gold, Copper, Silver, and Platinum. Coordination Features and Mesomorphic Behavior

Chico

Domínguez

Donnio

et al. 2016

Crystal Growth & Design

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Stable organometallic complexes [AuX(CN-TriPh)] [X = Cl, C6F5, C6F4O-C10H21, C6F4O-(R)-2-octyl], [(μ-4,4′-C6F4C6F4){Au(CN-TriPh)}2], [CuCl(CN-TriPh)], trans-[PtI2(CN-TriPh)2], and [Ag(CN-TriPh)2]BF4, bearing the previously unreported triphenylene-isocyanide ligand 1-isocyano-2,3,6,7,10,11-hexadodecyloxytriphenylene (CN-TriPh), have been synthesized. The coordination features of the metal ion determine their thermal behavior. The free isocyanide ligand and all of the monomeric gold derivatives display enantiotropic mesomorphic behavior over a wide range of temperature (from 5 to 220 °C), while the copper complex, with the same stoichiometry but not isostructural with the gold complexes, melts directly to an isotropic liquid. The bis-isocyanide platinum and silver complexes also melt directly to an isotropic liquid at low temperatures. In this case, the two trans coordinated isocyanide ligands, connected by a too short linker, cannot become coplanar, which prevents the formation of a mesogenic structure. On the contrary, in the dinuclear gold complex the two isocyanide trans ligands are, due to the long Au–C6F4–C6F4–Au bridge, sufficiently separated to become coplanar, and this complex gives rise to a mesophase. The structures of the mesophases were determined by small-angle X-ray scattering. All materials prepared show a fluorescent emission centered on the triphenylene core.

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Section: Introductionmentioning

confidence: 99%

Isocyano-Triphenylene Complexes of Gold, Copper, Silver, and Platinum. Coordination Features and Mesomorphic Behavior

Chico

Domínguez

Donnio

et al. 2016

Crystal Growth & Design

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“…With L 2 a,b ligands, no reaction took place under the same conditions, and all ligands were recovered, probably due to steric reasons. The analytical and NMR spectroscopic data for the products were consistent with the stoichiometry of mononuclear [Pd(L 1 ) 2 In principle, each of the three nitrogen atoms of the tetrazole ring is capable of acting as a coordination site. Structural studies have shown that tetrazole and its derivatives have a rich variety of coordination modes with transition metals 12 .…”

Section: Preparation Of Pd(ii) Complexes With Phenyltetrazole Ligands 11mentioning

confidence: 53%

“…Liquid crystals have been known for more than 100 years, but the number of structural types and classes of chemical compounds capable of exhibiting mesomorphic properties has increased significantly only during the last 15-20 years, for example, metal-containing liquid crystals, which are termed "metallomesogens", that combine the variety and range of metal based coordination chemistry with the extraordinary physical properties exhibited by liquid crystals 1,2 .…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and thermal properties of palladium(II) complexes containing phenyltetrazole. Crystal structure of trans-[C40H64N8 O2PdCl2]

Gallardo¹,

Begnini²,

Neves³

et al. 2000

J. Braz. Chem. Soc.

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Neste trabalho, descreve-se a síntese de novos ligantes e dos seus complexos de Pd(II) com os ligantes 5-(n-alcoxifenil)-2-n-alquiltetrazol (L 1 ) e α,ω-bis-[5-(4-pentoxifenil)-2-alcanotetrazois] (L 2 ). A determinação estrutural através de difração de raios-X do complexo de paládio contendo L 1 revela uma estrutura mononuclear na qual a geometria do cromóforo Pd(L 1 ) 2 Cl 2 é plana e possui um centro de inversão sobre o átomo de paládio. As moléculas de feniltetrazol estão ligadas ao íon metálico de forma monodentada e trans entre si, através de uma ligação σ, Pd-N1. Para o complexo de paládio contendo L 2 , propõe-se uma estrutura dinuclear, ([Pd 2 (L 2 ) 2 Cl 4 ]), com base em dados de espectroscopia de RMN e IV.The new 5-(n-alkoxyphenyl)-2-n-alkyltetrazole (L 1 ) and α,ω-bis-[5-(4-pentoxyphenyl)-2-alkanetetrazoles] (L 2 ) ligands and their Pd(II) complexes have been synthesized. The X-ray diffraction study of the palladium complex with L 1 reveals a mononuclear structure in which the geometry of the Pd(L 1 ) 2 Cl 2 chromophore is planar as required by the inversion center at the palladium atom, where each molecule of phenyltetrazole binds to the metal ion in a monodentate fashion via a Pd-N1 σ-bond. For the palladium complex with L 2 , a dinuclear structure ([Pd 2 (L 2 ) 2 Cl 4 ]) has been proposed on the basis of NMR and IR spectroscopy.

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“…В литературе содержится большое количество обзорных статей [2][3][4][5][6][7], многочис-ленные главы к книгам [8][9][10][11][12][13], а также монография Хосе-Луиса Серрано [14], практически полностью охватывающих исследования в области металл-содержащих ЖК вплоть до 2000-х годов. Кроме того, вышло много обзоров по отдельным направлениям в области металломезогенов, например лантанидомезогенов [15][16][17], золото-содержащих жидких кристаллов [18,19], ферро-ценомезогенов [20][21][22], ионных металломезогенов [23,24], полимерных металломезогенов [25,26], лиотропных металломезогенов [27], неоргани-ческих или металлоколлоидных жидких крис-таллов [28][29][30] и жидкокристаллических металло-дендримеров [31].…”

Section: к вопросу о классификации металломезогеновunclassified

Metallomesogens: Retrospectives and Perspectives

Kadkin¹,

Domracheva²,

Ovchinnikov³

2015

Liq. Cryst. and their Appl.

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Transition metal liquid crystals: advanced materials within the reach of the coordination chemist

Cited by 470 publications

References 158 publications

Isocyano-Triphenylene Complexes of Gold, Copper, Silver, and Platinum. Coordination Features and Mesomorphic Behavior

Isocyano-Triphenylene Complexes of Gold, Copper, Silver, and Platinum. Coordination Features and Mesomorphic Behavior

Synthesis, characterization and thermal properties of palladium(II) complexes containing phenyltetrazole. Crystal structure of trans-[C40H64N8 O2PdCl2]

Metallomesogens: Retrospectives and Perspectives

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