Synthesis and structure characterization of two new one-dimensional reduced molybdenum (V) phosphates with covalently bonded transition metal complexes

Two new one-dimensional reduced molybdenum (V) phosphates, [Zn(phen)2][Zn(phen)2(H2O)][Zn(HPO4)8[(MoO2)6(OH)3]2]·H2O (1) and [Co(phen)3][Co(phen)2(H2O)(H2PO4)][KNa(H2O)2][Co(H2O)2][Co(phen)2][Co(H2PO4)2(HPO4)3(PO4)3[(MoO2)6(OH)3]2]·5H2O (2) (phen=1,10-phenanthroline), have been synthesized and characterized by elemental analyses, IR, TG, and single crystal X-ray diffraction. Compound 1 is built up of Zn[P4Mo6]2 cluster as the structural motif covalently linked by [Zn(phen)2] complex subunits to yield unusual one-dimensional chains, which are further in close contact forming two-dimensional supramolecular layers via π–π stacking interactions. In compound 2, Co[P4Mo6]2 clusters are connected by [Co(phen)2], [Co(H2O)2] and [KNa(H2O)2] fragments through covalent bonds, forming an unusual one-dimensional chain. Interestingly, both [Co(phen)3] complex and [Co(phen)2(H2O)(H2PO4)] cobalt phosphate are presented as charge-compensating cations and contact each other via π–π stacking interactions to form a supramolecular chain, then the supramolecular chains link two neighboring chains that contain [P4Mo6] via hydrogen-bonding interactions to form a two-dimensional supramolecular layer. Furthermore, the fluorescent activity of compound 1 is reported.