A protocol for the synthesis of trinucleating C3-symmetric ligands based on a central meta-phenylene bridging 1,3,5-trimercaptobenzene (thiophloroglucinol) backbone has been established. The key compound turned out to be the trialdehyde obtained from the triple nucleophilic attack of dimethyldithiocarbamate at 1,3,5-tribromo-2,4,6-triformylbenzene. Reacting this trialdehyde with six equivalents of a primary amine results in the simultaneous dithiocarbamate cleavage and Schiff-base formation providing the extended thiophloroglucinol ligands H3bertdien, H6bertMe, H6bertt-Bu2, and H6habbi. Reaction with NiII leads to the formation of the trinuclear NiII3 complexes [(bertdien)NiII3](X)3 (X = BPh4−, BF4−), [(bertMe)NiII3], [(bertt-Bu2)NiII3], and [(habbi)NiII3], which are characterized spectroscopically, electrochemically, and crystallographically.
以 1,3,5- 三巯基苯(
硫代
葡糖醇)骨架为中心的元亚苯基桥为基础,合成三核 C3 对称
配体的方案已经确立。关键化合物是由 1,3,5-三
溴-2,4,6-三甲酰苯的
二甲基二硫代
氨基甲酸三重亲核反应得到的试
甲醛。将这种试料醛与六当量的
伯胺反应,会同时导致二
硫代
氨基甲酸酯裂解和希夫碱形成,从而产生扩展的
硫代
葡萄糖醛
配体 H3bertdien、H6bertMe、H6bertt-Bu2 和 H6habbi。通过与 NiII 反应,形成了三核 NiII3 复合物[(bertdien)NiII3](X)3(X = BPh4-、
BF4-)、[(bertMe)NiII3]、[(bertt-Bu2)NiII3]和[(habbi)NiII3],并对它们进行了光谱、电
化学和晶体学表征。