Syntheses, crystal structures and magnetic properties of two new bimetallic phosphates M(phen)(H2O)(VO)(H2O)(HPO4)(2) (M = Ni, Co; phen=1,10-phenanthroline)

摘要

Two novel layered organic-inorganic hybrid materials M(phen)(H2O)(VO)(H2O)(HPO4)(2) (M = Ni, Co) have been synthesized hydrothermally, their crystal structures and variable temperature magnetic susceptibilities were determined. Being characterized by single-crystal X-ray diffraction, the two compounds are isostructural and crystallize in the monoclinic system with P2(1)/c space group with a = 14.3903(7) Angstrom, b = 15.5232(6) Angstrom, c = 7.3943(3) Angstrom, beta = 90.577(2)degrees, Z = 4, V = 1651.7(2) Angstrom(3) and R-1 = 0.0358 for 1, and a = 14.3726(4) Angstrom, b = 15.5078(5) Angstrom, c = 7.3932(2) Angstrom, beta = 90.576(2)degrees, Z = 4, V = 1647.77(8) Angstrom(3) and R-1 = 0.0323 for 2. The structure exhibits an unusual 4,12-membered rings oxovanadium phosphate (V-P-O) layer capped by [M(phen)](2+) complexes with phen groups projecting above and below into the interlamellar regions. Therefore, the bimetallic phosphate undulating layers extend into three-dimensional supermolecular arrays through a strong pi-pi stacking interaction of the phen groups between adjacent layers. (C) 2004 Elsevier Inc. All rights reserved.