Metallo-mesogens and liquid crystals with a heart of gold

Syntheses, characterization and mesomorphic properties of new bis(alkoxyphenylazo)-substituted N,N? salicylidene diiminato Ni(ii), Cu(ii) and VO(iv) complexes

“…[7][8][9] Much of this attention on the synthesis and study of metallomesogens is due to the perceived advantages of combining the properties of liquid crystal systems with those of transition metals. [10][11][12] Bidentate and tetradentate salicylaldimine-based ligands (see Scheme 1) have been widely used in the synthesis of metallomesogens. The majority of these compounds described in the literature contain Cu(II), Ni(II), Ag(I), Pt(II), Pd(II), VO(IV), lanthanide or actinide 13 as the central metal ion.…”

Synthesis and reactions of cyclopalladated compounds derived from N,N′-dialkylbenzene-1,3-dicarbaldimines [alkyl = ethyl (H2L1), butyl or octyl] and N,N′-dibenzylbenzene-1,3-dicarbaldimine. Crystal structure of [Pd2L1(py)4][ClO4]2(py = pyridine)

“…The ease with which these compounds are formed and their stability to homolytic cleavage have made them attractive for reactivity Many such reactions 19-21 are useful in regio-and stereo-selective organic synthesis and in the formation of heterocyclic compounds. Cyclopalladated compounds are also being developed as liquid crystals 22, 23 and are used as catalysts in hydrogenation reactions. 24 Schiff bases are useful ligands for cyclopalladation While the variation of the alkyl substituents in H2L'-H2L3 influences the solubility behaviour of the cyclopalladated derivatives, H2L4 has been used to observe whether cyclometallation occurs to the central phenyl ring or the terminal phenyl rings.…”

Liquid crystals based on pseudohalogold(i) isocyanide complexes

“…Moreover the ®rst methylene group of the alkoxy chain is observed as a singlet at 68.1 ppm, and the remaining chain carbons appear in the range 31.8±14.0 ppm. Again independent signals for the two linkage isomers are not observed in spite of the greater chemical shift differences expected in 13 C spectroscopy. Attempts at recording the NMR spectra at low temperature failed due to precipitation of the compounds.…”