Bipodal Nâ²,Nâ²,Nâ´Nâ´-tetraalkyl-N,Nâ³-phenylenedicarbonylbis(thiourea) readily âself-assemble intoâ Pt2L2 and Pt3L3 metallamacrocyclic complexes depending on whether the S,O chelating moieties are meta or para relative to each other in the ligand. Thus treatment of PtCl42â with one equivalent of 3,3,3â²,3â²-tetra(n-butyl)-1,1â²-terephthaloylbis(thiourea), H2L1}2, leads to the exclusive formation of the cis-[Pt(L1-S,O)]3 complex, while 3,3,3â²,3â²-tetraethyl-1,1â²-isophthaloylbis(thiourea), H2L2}2, yields only the cis-[Pt(L2-S,O)]2 complex. The cis-[Pt(L1-S,O)]3 complex forms extremely friable crystals, necessitating X-ray data collection in mother-liquor, the lattice of which was found to contain chloroform, water and ethanol molecules as âguestsâ. By contrast, the sparingly soluble diethyl-substituted Pt2L2 complex does not include solvent molecules in the crystal lattice.
双顶N²,N²,N´N´-四烷基-N,N´³-苯基二羰基双(
硫脲)很容易 "自组装 "成Pt2
L2和Pt3L3
金属大环配合物,这取决于
配体中的S,O螯合基团是元螯合基团还是对位螯合基团。因此,用一个当量的 3,3,3â²,3â²-四(正丁基)-1,1â²-对苯二甲酰双(
硫脲)H2L1}2 处理 PtCl42â,就会形成唯一的顺式[Pt(L1-S、O)]3 复合物,而 3,3,3â²,3â²-四乙基-1,1â²-异
酞酰双(
硫脲),H2
L2}2 只产生顺式-[Pt(
L2-S,O)]2 复合物。顺式-[Pt(L1-S,O)]3 复合物形成的晶体非常易碎,因此必须在母液中收集 X 射线数据,结果发现母液晶格中含有
氯仿、
水和
乙醇分子。相比之下,
二乙基取代的 Pt2
L2 复合物溶解度很低,晶格中不包含溶剂分子。