Deyuan Kong, J. Mao, A. Martell
Jan 10, 2003
Citations
0
Influential Citations
9
Citations
Journal
Inorganica Chimica Acta
Abstract
Abstract A new dinucleating tetraaza-dioxo-diphenol macrocyclic ligand: 13,27-dimethyl-6,20-dioxa-3,9,17,23-tetraaza-tricyclo[23.3.1.111,15]triaconta-1(29),11, 13,15(30),25,27-hexaene-29,30-diol (L or BDOD) was synthesized and characterized. This ligand serves as the N4O4 2− motif for cation ions. The binding constants of divalent copper were determined using direct potentiometric titration. The logarithm formation constants of copper complexes are: log[CuL]=22.62 and log[Cu2L]=15.74. This macrocyclic ligand acts as the host to accommodate two copper ions at same time. The dinuclear copper complex were determined to be a central symmetric molecule with the formation of Cu2O2 bridge. Bond lengths of CuO(phenol) is 1.952 A, which is shorter than that of CuO(2) 2.368 A consistent with the expected Jahn–Teller distortion. CuN(av.) is 1.998 A. The coordination polyhedron of each copper ion is a slightly distorted square pyramid.