Mixed-ligand Copper(II) Complexes with N-isopropyl-iminodiacetato(2-) and C-phenyl-imidazole Ligands. Crystal Structures of H2iPIDA, [Cu(iPIDA)(H2φim)(H2O)]·3H2O and [Cu(iPIDA)(H5φim)

Abstract

The crystal of the N-isopropyl-iminodiacetic acid (1) consists of a 3D H-bonded framework where the zwitterion (H2iPIDA±) is intra-stabilized by one N+-H···O interaction and both carboxyl are half-protonated and involved in linear O-H···O inter-molecular bridges of 2.46 A. The mixed-ligand complexes [Cu(iPIDA)(H2ϕim)(H2O)]·3H2O (2) and [Cu(iPIDA)(H5ϕim)]n (3) have also been synthesized and studied by thermal, spectral, magnetic and X-ray diffraction methods. Both complexes exhibit a square base pyramidal coordination, type 4+1. Compound 3 is the less steric hindered 'remote' isomer, with H5ϕim instead of H4ϕim.