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

•Complex 1 and 2 was synthesized by single hydrothermal condition.•Compound 2 exhibits a unique stairs-like 2D layer structure built up from the trinuclear manganese (II) subunit.•Crystal structures reveal ligand displayed different coordination modes.

Two novel complexes including [Ni(Hdcppa)(H2O)4] (1) and {[Mn3(dcppa)2(H2O)6]·2H2O}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 MnII units linked through dcppa3−. Spectroscopic and electrochemical properties of the complexes 1–2 have also been studied in dimethyl sulfoxide solution at room temperature.

Graphical abstractTwo novel complexes including a mononucleaur compound [Ni(Hdcppa)(H2O)4] (1) and a 2D stairs-like coordination polymer {[Mn3(dcppa)2(H2O)6]2H2O}n (2) have been constructed from 5-(3′, 5′-dicarboxylphenyl) picolinic acid ligand.Figure optionsDownload full-size imageDownload as PowerPoint slide