Nickel(II) complexes with double alkyl chain functionalized N-heterocyclic carbene (NHC) ligands, [NiCl2(C12MIM)2] and [NiCl2(C12C12IM)2], where C12MIM = 1-dodecyl-3-methylimidazolin-2-ylidene (1) and C12C12IM = 1,3-didodecylimidazolin-2-ylidene (2), have been prepared and fully characterized by 1H NMR, 13C NMR, and CHN elemental analyses. Furthermore, we have developed a system, in which double long alkyl chain derivatized Ni–NHC complexes are dissolved in the related ionic liquid crystalline 1,3-didodecylimidazolium tetrafluoroborate, [C12C12IM][BF4], to form pre-organized structures for enhanced reactivity. Remarkably, differential scanning calorimetry, polarized optical microscopy, and temperature-programmed IR reflection absorption spectroscopy performed on a mixture of 10 wt% Ni complexes in [C12C12IM][BF4] demonstrate that this system retains an ionic liquid crystalline phase; even after immobilization onto a silica-100 support with pore filling α = 1.
镍 (II) 与双烷基链官能化 N-杂环卡宾 (NHC)
配体 [NiCl2(C12MIM)2] 和 [NiCl2(C12C12IM)2] 的络合物,其中 C12MIM = 1-
十二烷基-3-甲基
咪唑啉-2-亚基 ( 1) 和 C12C12IM = 1,3-
二十二烷基
咪唑啉-2-亚基(2),已制备并通过 1H NMR、13C NMR 和 CHN 元素分析进行充分表征。此外,我们还开发了一种系统,其中双长烷基链衍生的 Ni-NHC 配合物溶解在相关离子液晶 1,3-
二十二烷基
咪唑鎓四
氟硼酸盐 [C12C12IM][BF4] 中,形成预组织结构以增强反应活性。值得注意的是,对 [C12C12IM][BF4] 中 10 wt% Ni 配合物的混合物进行的差示扫描量热法、偏光光学显微镜和程序升温红外反射吸收光谱表明,该系统保留了离子液晶相;即使在固定到具有孔隙填充 α = 1 的 Silica-100 载体上之后也是如此。