In this perspective, some of the general phenomena associated with liquid-crystal behaviour are introduced before selective consideration is given to the effect which a metal can have when it forms part of a liquid-crystalline molecule.

Dalton perspectives. The synthesis and properties of metal-containing liquid-crystal systems: what can the metal do for you?

The synthesis and mesomorphic (liquid crystal) properties of new binuclear dihalocopper(II) complexes derived from N- and ring-substituted salicylaldimine Schiff bases are reported, together with the mesomorphic properties of their monomeric precursor complexes. With just N-substituents both the dichlorodicopper(II) binuclear complexes and their mononuclear analogues are waxy solids with melting points that increase with their N-chain length. However, with both N- and ring-substituents in the 4-positions, the mononuclear and binuclear complexes are each liquid crystalline or mesogenic, except in case of the mononuclear complexes where the N-substituent is straight chain alkyl. The other mononuclear complexes exhibit a variety of liquid crystal phases:  smectic A, C, and E (SA, SC, and SE, respectively). The liquid crystal phase SA is observed in the binuclears with shorter chain N-substituents p-R−O−C6H4− and shorter chain ring-substituents. The chain lengths were increased until the phase behavior expand...

Synthesis and mesogenic properties of binuclear copper(II) complexes derived from salicylaldimine Schiff bases.

Paramagnetic chiral smectic C materials : a new class of ferroelectric liquid crystals

The synthesis and mesomorphic properties of a homologous series ofN-(2-hydroxy-4-n-alkoxybenzylidene)-3′,4′-di-n-alkoxylanilines and their copper(ii) complexes bis[(N-3′,4′-dialkoxyphenyl)-4-n-alkoxylsalicylaldiminato]copper(ii) are reported. The disc-like copper complexes exhibited columnar hexagonal disordered mesophases, which were characterized by DSC analysis and optical polarized microscopy. The structure of the mesophases was confirmed by X-ray powder diffraction (XRD). The mesomorphic properties for these copper complexes were compared with other similar metallomesogenic bis(salicylaldiminato)copper(ii) complexes in terms of molecular structural differences.

Liquid crystalline properties of bis(salicylaldiminato)copper(II) complexes: the first columnar discotics derived from salicylaldimine Schiff bases

The synthesis, characterization and thermal behaviour of several new series of copper(II) complexes derived from carbonylic compounds and their Schiff's bases are reported. The complexes are of two types; [Cu(C6H3O(R)-C(X) = O)2], (type I) and [Cu(C6H3O(R)-C(X) = N-R′)2] (type II) where R = - OOC-C6H4OC10H21-p, and the position of R is 4 or 5; R′ = CH3, n-C10H21, p-n-C10H21O(C6H4)-; X [dbnd] H, CH3. In type I complexes, only the compound with X [dbnd] H and R in position 5 showed mesomorphism. For type II complexes, all the Schiff's bases complexes of copper(II) derived from 2,4-dihydroxybenzaldehyde showed thermotropic mesophases (smectic C and nematic), whereas the complexes derived from 2,5-dihydroxybenzaldehyde were only mesogenic when the imine was derived from methylamine. None of the complexes derived from the ketone (2,4 or 2,5-dihydroxy derivatives) showed liquid-crystalline properties. X-ray studies of four complexes of type II were carried out. The anisotropy of the magnetic susceptibi...

Novel liquid-crystalline derivatives of transition metals. The effect of the molecular geometry of the ligands on the mesogenic properties of tetracoordinated copper(II) complexes

The synthesis, characterization and thermal behavior of several new series of Copper (II) complexes derived from Schiffs bases are reported. The complexes are of the type: [Cu{C6H3O(OR)‒C(Z)=N‒R′}2] (R=n‒C n H2n+1+, R′=p-n-alkoxy-(C6H4)‒, p-n-alkyl‒(C6H4)‒, n-alkyl; Z˭H, CH3). Sehiffs base complexes of Copper (II) derived from an aldehyde show thermotropic mesophases (smectic discotic polymorphism), whereas complexes derived from a ketone do not. When the amine forming the imine ligand is an aromatic amine the complexes form liquid crystals, whereas if the amine is aliphatic the complexes do not give liquid crystals.

Liquid Crystal Derivatives of Transition Metals (I): Tetracoordinated Copper (II) Complexes Derived From Schiffs Bases

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Liquid Crystal Derivatives of Transition Metals (I): Tetracoordinated Copper (II) Complexes Derived From Schiffs Bases