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Relevant academic research and scientific papers

Hydrogen bonded liquid crystal from nitrophenols and alkoxystilbazoles

Tree series hydrogen bonded adducts have been formed between 4-alkoxy-4'-stilbazoles and the nitrophenols 4-nitrophenol, 3-nitrophenol and 2,4-dinitrophenol.Each series is mesomorphic displaying both nematic and smectic.A phases, in sharp contrast to the

Tuning the photonic properties of chiral nematic mesoporous organosilica with hydrogen-bonded liquid-crystalline assemblies

A series of novel hydrogen-bonded assemblies was synthesized and characterized with respect to their liquid-crystalline behaviour. Solid-state NMR spectroscopy gave insight into the columnar nematic mesophase and the corresponding ordering and alignment.

Novel Ion Containing Liquid Crystals and Liquid Crystalline Main Chain Polymers Based on Trans-1,2-Bis(4-Pyridyl Ethylene) Mesogen

Ion bearing liquid crystalline compounds based on trans-1,2-bis(4-pyridinium)ethylene were synthesized and studied.These compounds included low molecular mass analogues, twin model compounds and main chain ionomers.Most of these exhibited liquid crystallinity of the smectic type.As a general rule the introduction of charges into the mesogenic moiety increased the stability (transition temperature) of the mesophase.Large supercooling effects, broad mesophase intervals and tendency to polymorphism are common features of these ionic mesogenic compounds.In the case of twin model compounds a variety of smectic phases were observed.The nature of these was dependent on the nature of the counterion and the thermal history of the compound.Tosylate or p.toluene sulfonate counterions promoted a higher degree of order in smectic mesophases as well as higher transition tempertures compared to methylsulfonate counterions.A pronounced odd-even effect of the isotropisation temperature of the twin compounds was observed.Compounds with even numbered methylene spacers display higher transition temperatures than those with an odd spacer.Only polymers with methylsulfonate and toluenesulfonate counterions were found to exhibit both, thermotropic and lyotropic mesophases.Thermotropic mesophases were characterized as smectic mesophases of lower order (SA).The nature of lyotropic mesophases were not determined.High transition temperatures and concommitant oxydative crosslinking made the study of polymers with halogen counterions difficult.Polymers with halogen and perchlorate counterions were found fo be poorly soluble in water precluding the formation of lyotropic mesophases.The introduction of a few siloxane bonds into the flexible spacer joining the charged mesogen moieties has a dramatic effect on lowering the transition temparatures and making possible the study of mesophases up to their isotropisation temperature.Preliminary characterization of polymers with siloxane containing spacer and methylsulfonate/tosylate counterions suggest a smectic mesophase of lower order. - Keywords: Ion containing liquid crystals, liquid crystal ionomers

Mesomorphic metal complexes derived from 4-alkyloxystilbazoles

The weakly mesomorphic trans-4-alkyloxy-4′-stilbazoles (n-OPhVPy) are readily synthesised from alkyloxyiodobenzenes and 4-vinylpyridine in a palladium-catalysed Heck reaction. While the highly symmetric palladium and platinum complexes trans-[MCl2(n-OPhVPy)2] show mesophases only at very high temperatures, the lower symmetry platinum complexes trans-[PtCl2(η2-olefin) (n-OPhVPy)] melt below 100°C. Similarly, the complexes [MCl(CO)2(n-OPhVPy)] (M = Rh, Ir) are low melting. The silver complexes [Ag(n-OPh VPy)2][X] (X = C12H25OSO3, C8H17OSO3, CF3SO3) can be obtained by direct reaction of the stilbazole with AgX. These ionic materials show a rich thermotropic polymorphism, including nematic and cubic mesophases. Some fluorinated stilbazoles have also been synthesised and complexed to silver; the mesomorphism of these complexes is also reported.