185010-22-4Relevant academic research and scientific papers
Syntheses and mesomorphic properties of gold(I)-carbene complexes
Zhang, Shi-Wei,Ishii, Rie,Takahashi, Shigetoshi
, p. 20 - 26 (2008/10/08)
The liquid-crystalline gold(I)-carbene complexes ClAu=C(YCmH2m+1)(NHC6H4CO 2C6H4-OCnH2n+1), Y = O and NH, have been prepared by reactions of gold(I)-isonitrile complexes [ClAU{CNC6H4CO2C6H 4OCnH2n+1}] with alcohols and amines, respectively. The gold(I)-(alkoxy)(amino)carbene complexes show stable enantiotropic smectic A phases over the range of around 15 °C. The partial double-bond character of the C-N bond in the carbene complex gives rise to two geometrical isomers (E:Z = ca. 3:1). Their molecular structures were spectroscopically characterized, and the E-isomer was confirmed by an X-ray structural analysis. The phase behaviors of E- and Z-isomers which were isolated by repeated recrystallization from CHCl3/Et2O or CH2Cl2/C6H14 were examined. In the gold(I)-diaminocarbene complexes, a novel dinuclear gold-carbene complex, [ClAu{C(NHC6H4-CO2C6H 4OCnH2n+1)}](NCH3CmH 2mNCH3)[ClAu{C(NHC6H4CO 2C6H4OCnH2n+1)}], was synthesized by the reaction with a secondary diamine. This dinuclear complex generated a smectic mesophase although it decomposed at temperatures below its clearing temperature.
