Syntheses and Mesomorphic Properties of Gold(I)−Carbene Complexes
摘要:
The liquid-crystalline gold(I)-carbene complexes ClAu=C(YCmH2m+1)(NHC6H4CO2C6H4OCnH2n+1), Y = O and NH, have been prepared by reactions of gold(I)-isonitrile complexes [ClAu{CNC6H4CO2C6H4OCnH2n+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 degrees 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/Et(2)O or CH2Cl2/C6H14 were examined. In the gold(I)-diaminocarbene complexes, a novel dinuclear gold-carbene complex, [ClAu{C(NHC6H4CO2C6H4OCnH2n+1)}](NCH3CmH2mNCH3)[ClAu{C(NHC6H4CO2C6H4OCnH2n+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.
有机片段对一系列有机金(I)异氰化物配合物的介晶性质的影响。[Au(CCC 5 H 4 N)(CNC 6 H 4 O(O)CC 6 H 4 OC 10 H 21)的X射线晶体结构]
摘要:
制备棒状有机金(I)配合物[AuR(CNC 6 H 4 O(O)CC 6 H 4 OC 10 H 21 - p)],并研究其液晶行为。取决于R的性质,合成方法是不同的。因此,对于R =取代的炔基配体,分两个步骤制备新化合物:(i)[AuCl(tht)](tht =四氢噻吩)与R'CCH(R'= C 5 H 4 N,C 6 H 4 CN,C 6 H 4 CCC 5 H 4 N)在NaOAc的存在下产生不溶性[Au(CCR')] n; (ii)后者与异腈CNC 6 H 4 O(O)CC 6 H 4 OC 10 H 21 - p的反应。对于R =氟化芳基,通过从化合物[AuR( tht)](R = C 5 F 4 N,C 6 F 4 C 5 H 4 N,C 6 F 5)与异腈。此外,意外的离子衍生物[Au(CCC 5 H 4 NC 10 H 21)2 ] [Au(CCC第五名ħ 4 N)2 ]被形成了[PPH之间的反应4