A hexa-{MnIII–Schiff-base}-decorated cyclic polyoxovanadate as photocatalyst for dye degradation

Abstract A new organic–inorganic hybrid compound (NH 4 ) 2 [{Mn(salen)(H 2 O)} 6 V 6 O 18 ](NO 3 ) 2 ·30H 2 O (salen 2−  =  N , N ′-(ethylene)bis(salicylideneiminate)) ( 1 ) was synthesized by the reaction between NH 4 VO 3 and [Mn(salen)(H 2 O) 2 ]ClO 4 in a methanol–water solution with pH = 5.0 adjusted by nitric acid. Compound 1 was characterized by elemental analyses, TG, IR, UV–vis, XPS and the single-crystal X-ray diffraction. Compound 1 possesses a discrete cyclic hexanuclear vanadates, which is unprecedentedly grafted by six [Mn(salen)(H 2 O) 2 ] units. Such a new hybrid compound displays good UV photocatalytic activity for RhB degradation.