Crystal structures of [Mn(bdc)(Hspar)2(H2O)0.25]·2H2O containing MnO6+1 capped trigonal prisms and [Cu(Hspar)2](bdc)·2H2O containing CuO4 squares (Hspar = sparfloxacin and bdc = benzene-1,4-di­carboxyl­ate)

The title compound, poly[(3-formato)(4-oxalato)terbium(III)], [Tb(CHO2)- (C2O4)]n, is a three-dimensional coordination polymer, and is isotypic with the LaIII, CeIII and SmIII analogues. The asymmetric unit contains one TbIII ion, one formate anion (CHO2 ) and half of an oxalate anion (C2O4 2), the latter beingcompleted by application of inversion symmetry. The TbIII ion is ninecoordinated in a distorted tricapped trigonal–prismatic manner by two chelating carboxylate groups from two C2O4 2 ligands, two carboxylate oxygen atoms from another two C2O4 2 ligands and three oxygen atoms from three CHO2 ligands, with the Tb—O bond lengths and the O—Tb—O bond angles ranging from 2.4165 (19) to 2.478 (3) A˚ and 64.53 (6) to 144.49 (4), respectively. The CHO2 and C2O4 2 anions adopt 3-bridging and 4-chelating-bridging coordination modes, respectively, linking adjacent TbIII ions into a threedimensional 12-connected fcu topology with point symbol (324.436.56 ). The title compound exhibits thermal stability up to 623 K, and also displays strong green photoluminescence in the solid state at room temperature.