Hydrothermal syntheses and photocatalytic performance of three Mn-based coordination complexes constructed from 1,10-phenanthroline and polycarboxylic acids

Abstract

Three coordination complexes based on manganese, namely Mn(phen)(5-Br-ipa) (1), Mn(phen)(5-NO2-ipa) (2), and [Mn(phen)2(3,4-H2dczpb)]·H2O (3) (phen = 1,10-phenanthroline; 5-Br-ipa = 5-bromoisophthalic acid; 5-NO2-ipa = 5-nitroisophthalic acid; 3,4-H4dczpb = 3,4-dicarboxyl-(3′,4′-dicarboxylazophenyl)benzene), have been synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction, FTIR, elemental analysis, and UV–Vis diffuse reflection spectroscopy. The photocatalytic efficiencies of the complexes for the decomposition of methylene blue under UV irradiation were also investigated. These complexes show 2D sheet, 1D chain and 0D discrete structures due to the different coordination environments of the Mn(II) centers and the number of phen ligands.