Three New Complexes Based on the Flexible Zwitterionic Dicarboxylate Ligand: Synthesis, Structures, and Properties

Abstract

AbstractThree new complexes have been prepared based on the transition metals and zwitterionic dicarboxylate ligand 1,1′‐(1,4‐phenylene‐bis(methylene))‐bis(pyridine‐3‐carboxylic acid) (L), whose formulas are {[Cd4(L)(SO4)]· (Cl)6}n (1), [Zn(L)Cl2]n (2), and [Co(L)Cl2]n (3), respectively. Complexes 1–3 have been characterized by elemental analyses, IR spectroscopy, XRD, thermal analyses and single crystal X‐ray (powder) diffraction. 1 crystallizes in monoclinic space group C2/m, displaying a 2‐D layer structure with three unique Cd2+ centers. 2 and 3 are isomorphic structures with the orthorhombic Cmca space group. They exhibit a 1‐D zigzag chain, which can be linked to generate a 2‐D layer via hydrogen bonding interactions (CH···O). Moreover, electrochemical behavior reveals that the redox reaction of 3‐CPE is a surface‐controlled reaction. And the luminescent properties of the title complexes have been investigated at room temperature.