LIQUID-CRYSTALLINE BEHAVIOR OF DI-PALLADIUM AND MONO-PALLADIUM ORGANYLS - 2 WAYS OF LYOMESOPHASE FORMATION

Three members of a series of lath-like dinuclear complexes [Pd-2(mu-Cl )(2)(C,N)(2)] 1, (C,N = orthopalladated imine R(1)-C6H3-CH=N-C6H4-R(2) ; R(1) = alkoxy chain; R(2) = alkyl or alkoxy chain), a dinuclear cycl opalladated complex with mixed bridges (acetate/thiolate) 2 and a mono nuclear orthopalladated complex incorporating a beta-diketonate ligand 3, have been synthesized and their lyotropic phase behaviour in mixtu res with apolar organic solvents (linear alkanes, cycloocta-1,5-diene or limonene) has been studied. The lyotropic mesomorphism is determine d by the combination of the length of the metalloorganyl side chains a nd the length of alkane used as solvent. Two ways of formation of lyot ropic phases are found. The first case of lyotropic chiral nematic (ch olesteric, N) phase formation in a binary system composed of a non-ch iral di- or mono-palladium organyl and a chiral apolar organic solvent is reported.