Dicyanamide Bridged Cu(II)36-Metallacrown-6 Complex with 147-Triisopropyl-147-Triazacyclononane and Binding Properties with DNA

摘要

A novel 36-metallacrown-6 complex [CuL(N(CN)2)(PF6)]6∙0.5H2O >1 was achieved using a tridendate ligand, 1,4,7-triisopropyl-1,4,7-triazacyclononane (L), and a flexible ligand, dicyanamide in MeOH. The μ1,5 bridging models of the dicyanamide ligand linked the macrocycle to form in a specific size with the chair conformation. The anion was important to form this 36-metallacrown-6 complex, as change was obtained with the larger anion BPh4⁻, binuclear copper compound >2. The magnetic property indicates that slightly ferromagnetic interactions resulted from a superexchange mechanism. DNA binding properties were also studied. UV and fluorescence spectra showed that complex >1 could bind with DNA.