Synthesis and Structural Characterization of Two Novel Copper(II) Schiff Base Complexes and their Water-Containing Supramolecular Structures

Abstract

Two novel copper(II) complexes, Cu₂L₂(bipy) and Cu₂L₂(H₂O)₄·3H₂O of Schiff base ligands derived from the condensation of L-tert-leucine and L-isoleucine with 2,4-dihydroxybenzaldehyde, are synthesized and characterized by single crystal X-ray diffraction. Compounds crystallize in the orthorhombic crystal system. The Cu₂L₂(bipy) complex has a distorted square planar geometry with an N₂O₂ coordination environment. Water is contained in supramolecular network pores. On the other hand, in the Cu₂L₂(H₂O)₄·3H₂O complex, both copper atoms adopt a five-coordinated distorted square-pyramidal geometry with an NO₄ coordination environment and guest water molecules form a 1D water chain. Both complexes build a 2D supramolecular network.