Synthesis and structural characterization of two new copper(II) complexes with 3-oxapentane-1,5-diamine using different molar ratio

Abstract

The reactions of copper(II) nitrate with 3-oxapentane-1,5-diamine (Oda) were investigated under different molar ratio. In the case of a 1: 1 molar ratio of copper(II) nitrate and Oda, the mononuclear complex [Cu(Oda)(NO₃)₂] (I) was obtained. In contrast, the treatment of copper(II) nitrate with twice Oda afforded inorganic polymer {[Cu(μ-Oda)(Oda)] · (NO₃)₂}_n (II). The molecular structures of the two new complexes were determined from the elemental analyses, IR spectra and single-crystal X-ray diffraction (CIF files CCDC nos. 828193 (I) and 828018 (II)). Two Cu(II) complexes were both five-coordinated and forming a distorted square-base pyramidal geometry. Two complexes are stabilized by the intermolecular hydrogenbond.