Preparation,crystal structures and spectroscopic characterization of oxalate copper(II) complexes containing the nitrogen ligands 4,4′-dimethyl-2,2′-bipyridine and di(2-pyridyl)sulfide |
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| Authors: | Daniella M de Faria Maria Irene Yoshida Carlos B Pinheiro Kassílio José Guedes Klaus Krambrock Renata Diniz Luiz Fernando C de Oliveira Flávia C Machado |
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| Institution: | 1. Departamento de Química – ICE, Universidade Federal de Juiz de Fora, Juiz de Fora-MG 36036-330, Brazil;2. Departamento de Química – ICEx, Universidade Federal de Minas Gerais, Belo Horizonte-MG 31270-901, Brazil;3. Departamento de Física – ICEx, Universidade Federal de Minas Gerais, Belo Horizonte-MG 30123-970, Brazil |
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| Abstract: | The preparation, crystal structures and spectroscopic characterization of four oxalate copper(II) complexes containing the 4,4′-dimethyl-2,2′-bipyridine (Mebpy) or di(2-pyridyl)sulfide (DPS) nitrogen ligands namely μ-(ox){Cu(Mebpy)(NO3)(H2O)}2] (1), μ-(ox){Cu(Mebpy)(ClO4)(H2O)}2] (2), μ-(ox){Cu(DPS)(H2O)}2](ClO4)2 (3) and Cu(DPS)(ox)(H2O)] · 2H2O (4) are described. X-ray diffraction measurements have shown that complexes 1–3 are binuclear, in which the oxalate anion bridges two Cu(II) centers, while the complex (4) is mononuclear and the oxalate anion adopts the terminal bidentate chelating coordination mode. In 1 and 2 the Cu(II) sites display a distorted octahedral geometry (4+2 environment) and in compounds 3 and 4 the Cu(II) centers exhibit a slightly distorted square pyramidal geometry. In addition, complexes 1 and 2 present a 2D supramolecular arrangement through hydrogen bonds between coordination water molecules and nitrate or perchlorate anions and π-stacking interaction between the pyridyl rings of Mebpy nitrogen ligands. |
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| Keywords: | Copper(II) complexes Di(2-pyridyl)sulfide 4 4&prime -Dimethyl-2 2&prime -bipyridine Oxalate dianion Molecular building blocks |
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