Structures and spectroscopic properties of Ni(II) and Mn(II) complexes based on 5-(3′, 5′-dicarboxylphenyl) picolinic acid ligand

Abstract Two novel complexes including [Ni(Hdcppa)(H 2 O) 4 ] ( 1 ) and {[Mn 3 (dcppa) 2 (H 2 O) 6 ]·2H 2 O} n ( 2 ) have been synthesized and characterized by single crystal X-ray structure analysis and elemental analysis. Results show that 1 is a mononuclear nickel(II) compound with octahedron coordination geometry, while 2 is a stairs-like 2D layer structure consisting of the trinuclear Mn II units linked through dcppa 3− . Spectroscopic and electrochemical properties of the complexes 1 – 2 have also been studied in dimethyl sulfoxide solution at room temperature.