A Conspicuous Deprotonation in Complexes of Diphenyllead(IV) with Ligands Containing Both Semicarbazone and Thiosemicarbazone Chains
作者:José S. Casas、Estefanía Castro‐Vidal、María S. García‐Tasende、Agustín Sánchez、José Sordo、Ángeles Touceda、Ezequiel M. Vázquez‐López
DOI:10.1002/ejic.201001030
日期:2011.2
previously unknown [PbC2N3OS] kernel. In the H2L2 and H2L3 complexes the coordination for the diphenyllead(IV) moiety is the same, with the ligand N,N,S,O-bound, but these complexes differ in the protonation status of the SC chain. In [PbPh2(OAc)(HL2)]·MeOH the chain is not deprotonated, and in [PbPh2(L3)(dmso)]·2dmso it is deprotonated. Conspicuously, in [PbPh2(H0.5L3)(MeOH)](OAc)0.5 the SC “arm” is formally
在寻找新的有机铅 (IV) 离子螯合剂的过程中,2,6-二乙酰基吡啶依次与氨基脲和 4-甲基氨基硫脲缩合得到 H2L1。根据 X 射线研究,该分子分别与缩氨基脲 (SC) 和缩氨基硫脲 (TSC) 链在“开臂”和“闭臂”方向上几乎呈平面。2,3-丁二酮与氨基脲和4-甲基氨基硫脲或与4-苯基氨基脲和4-苯基氨基硫脲的类似缩合分别提供H2L2和H2L3。H2Lx 与二乙酸二苯铅 (IV) 在甲醇中反应得到复合物 [PbPh2(HL1)](OAc)0.75Cl0.25·2.375H2O、[PbPh2(OAc)(HL2)]·MeOH 和 [PbPh2(H0.5L3) )(MeOH)](OAc)0.5。当后者从 dmso 中重结晶时,分离出新的衍生物 [PbPh2(L3)(dmso)]·2dmso。H2L1 复合物的 X 射线研究表明,TSC 链去质子化而 SC 链未去质子化的配体通过 N3、N4、N5、O1