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Counter-anions and their coordination behavior with Cu(II) complexes of thiophen-3-yl-dipicolylamine
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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 N3S donor. Cu(II) complexes of this ligand were isolated. When Cu(NO3)2 was used as the metal source, a homobinuclear complex with the formula [CuThDPA(NO3)2]2譎2O, 1, with two different types of nitro coordination was isolated. 1 crystallizes in the monoclinic P21/n space group with a=15.193, b=8.181, c=32.827 �, b=103.3o and V=3971.9 � In the case of CuSO4 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. 2, with the formula [CuThDPA(SO4)]2�H2O, crystallizes with 3 water molecules per binuclear structure in the monoclinic space group P21/c with a=10.143, b=17.013, c=11.793 �, b=97.18o and V=2019.1 � and 3, [CuThDPA(SO4)]2�H2O, crystallizes with 4 water molecules per binuclear structure in the triclinic P-1 space group, with a=9.2906, b=10.7297, c=12.7236 �, a=79.66, b=72.18, g=67.1o and V=1109.7 �