Three-dimensional open-framework Co-II and Zn-II phosphates synthesized via the amine phosphate route

Abstract

The reaction of amine phosphates with metal ions, under mild conditions, has been utilized for the synthesis of open-framework phosphates. Two new amine phosphates, DABCO-phosphate and imidazole-phosphate, synthesized for the first time, were employed for this purpose. Thus, DABCO-phosphate reacts with Co(II) and Zn(II) ions giving rise to open-framework structures, of which [C6N2H14][Co-2(HPO4)(3)], I, is a new 3-dimensional structure. Reaction of imidazole phosphate with Zn(II) ions gave a new phosphate, II, [C3N2H6][Zn-4(OH)((PO4)(3)]. Both I and II have linkages involving MO4 (M = Co, Zn) and PO, tetrahedra giving rise to three-dimensional structures. While I has two distinct channels along the crystallographic directions, II possesses only one-dimensional channels along with one-dimensional infinite Zn-O-Zn chains. (C) 2000 Editions scientifiques et medicales Elsevier SAS. All rights reserved.