that can change its complexation behavior by C−C bond formation has been developed. The acyclic tetraoxime ligand H4L1 having two terminal allyl groups was synthesized. The olefin metathesis of H4L1 selectively produced trans-H4L2 while the reaction of [L1Zn2Ca] exclusively afforded cis-H4L2. The saturated analogue H4L3 was synthesized by hydrogenation. The complexation of the ligands H4L (L = L1, trans-L2
已经开发出一种可以通过C-C键形成改变其络合行为的新型多
金属络合系统。合成具有两个末端烯丙基的无环四
肟配体H 4 L 1。H 4 L 1的烯烃复分解选择性地产生反式-H 4 L 2,而[L 1 Zn 2 Ca]的反应仅提供顺式-H 4 L 2。通过氢化合成饱和的类似物H 4 L 3。
配体H 4 L(L = L 1,反式-L 2,顺式-L 2,L 3)与
醋酸锌(II)(3当量)产生三核配合物[LZn 3 ],其三乙酰核的核心相似,由
乙酰乙酸酯
配体桥接。具有无环
配体的[L 1 Zn 3 ]的形成过程是高度协作的,而大环类似物[LZn 3 ](L =反式-L 2,顺式-L 2,L 3)是通过逐步形成的。中间体2:3络合物[(HL)2 Zn 3 ]。三核配合物[LZn 3](L = L 1,反式-L 2,顺式-L 2,L 3)可以通过位点选择性
金属交换识别碱土
金属离子。非环状的[L 1 Zn 3 ]选择性地识别Ca