The title compound, [Mn(2,4,6-TMBA)2(H2O) 3]n·2nH2O (1), where 2,4,6-TMBA=2,4,6-trimethylbenzoic acid, was synthesized and its crystal structure was determined by X-ray diffraction analysis. The crystal is of monoclinic, space group C2/c with a=2.9299(6) nm, 6=1.0364(2) nm, c=8.22204(17) nm, V=2.4947(9) nm3, Z=4, M=471.40, Dc=1.255 g·cm-3, μ=0.571 mm-1, F(000)=996, R int=0.0294, R=0.0376 and wR=0.0949. The Mn atoms are octahedrally coordinated by two O atoms of two ligands and four O atoms of water. The carboxyl group coordinates to Mn(II) i...