Dinuclear alkoxo-bridged copper(II) coordination polymers: Syntheses, structural and magnetic properties |
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| Authors: | Petri Seppä lä ,Enrique Colacio,Reijo Sillanpä ä |
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| Affiliation: | a Department of Chemistry, University of Jyväskylä, P.O. Box 35, Jyväskylä FIN-40014, Finland
b Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Granada, 18071, Granada, Spain |
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| Abstract: | The alkoxo-bridged dinuclear copper(II) complexes [Cu2(ap)2(NO2)2] (1), [Cu2(ap)2(C6H5COO)2] (2) and [Cu2(ap)2μ-1,3-C6H4(COO)2(dmso)2]·dmso (3) (ap = 3-aminopropanolato and dmso = dimethyl sulfoxide) have been synthesized via self-assembly from copper(II) perchlorate, 3-aminopropanol as main chelating ligand and nitrite and isophthalate anions as spacers and benzoate anion as auxiliary ligand. Complexes 1 and 3 crystallize as 2D and 1D coordination polymers, respectively, and their structures consist of dinuclear [Cu2(ap)2]2+ units connected with nitrite and isophthalate ligands. The adjacent dinuclear units of 2 and 1D polymers of 3 are further connected by hydrogen bonds resulting in the formation of 2D layers. The variable temperature crystallographic measurements of 1 at 100, 173 and 293 K indicate the static Jahn-Teller distortion with librational disorder in the nitrite group. Experimental magnetic studies showed that complexes 1-3 exhibit strong antiferromagnetic couplings. The values of the magnetic exchange coupling constant for 1-3 are well reproduced by the theoretical calculations. |
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| Keywords: | Dinuclear copper(II) complexes Alkoxo-bridged complexes Coordination polymers Magnetic properties Pseudo-Jahn-Teller effect DFT calculations |
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