Counter-anions and their coordination behavior with Cu(II) complexes of thiophen-3-yl-dipicolylamine

摘要

A new ligand, 1-(pyridin-2-yl)-N-(pyridin-2-ylmethyl)-N-(thiophen-3- ylmethyl)methanamine, ThDPA, was synthesized, as a new example of an N _3S donor. Cu(II) complexes of this ligand were isolated. When Cu(NO_3)_2 was used as the metal source, a homobinuclear complex with the formula [CuThDPA(NO_3)_2] _2·H_2O, 1, with two different types of nitro coordination was isolated. 1 crystallizes in the monoclinic P2_1 space group with a = 15.193, b = 8.181, c = 32.827, β = 103.3° and V = 3971.9 ~3. In the case of CuSO_4 as the source of copper(II), uncommon sulfato-bridged structures were isolated. The homobinuclear complex crystallized in two different lattices, depending on the solvent evaporation rate. Compound 2, with the formula [CuThDPA(SO_4)] _2·3H_2O, crystallizes with 3 water molecules per binuclear structure in the monoclinic space group P2_1/c with a = 10.143, b = 17.013, c = 11.793, β = 97.18° and V = 2019.1 ~3, and 3, [CuThDPA(SO_4)]_2·4H _2O, crystallizes with 4 water molecules per binuclear structure in the triclinic P1? space group, with a = 9.2906, b = 10.7297, c = 12.7236, α = 79.66, β = 72.18, γ = 67.1° and V = 1109.7 ~3.