Co-templated synthesis and characterization of two new 1D zincophosphates, [CoIII(dien)2][Zn(PO4)(HPO4)]·H3BO3 and [CoIII(dien)2][Zn2(PO4)(HPO4)2]·C2H6O2

Abstract

Two 1-D zincophosphates, [Co^III(dien)₂][Zn(PO₄)(HPO₄)]·H₃BO₃ (1) and [Co^III(dien)₂][Zn₂(PO₄)(HPO₄)₂]·C₂H₆O₂ (2), have been synthesized under solvothermal conditions at 130 °C. Their structures were determined by single-crystal X-ray diffraction and further characterized by FTIR, elemental analysis and TG analysis. The structures of 1 and 2 consist of ZnO₄, PO₄ and HPO₄ tetrahedra with sharing corners, forming strictly alternate four-membered rings for 1 and the 4 = 1 secondary building units for 2. The adjacent chains in 1 and 2 are further connected into 2-D and 3-D networks by ionic interactions and hydrogen bonds. The complex cation, s-cis Co(dien)₂³⁺ and neutral molecule, boric acid dimer linked through H-bonds for 1 and ethylene glycol (EG) for 2, co-play the roles of structure-directing agents in the formation of the inorganic networks of 1 and 2, respectively.