Xanthine complexes with 3d metal perchlorates |
| |
| Affiliation: | 1. Laboratory of Catalysis, MolSys Research Unit, Institut de Chimie Organique (B6a), Allée du six Août 13, Université de Liège, Liège 4000, Belgium;2. Unidade de Difracción de Raios X, RIAIDT, Universidade de Santiago de Compostela, Campus Vida, Santiago de Compostela 15782, Spain;1. Department of Economics, University of Foggia, Via Caggese 1, 71121 Foggia, Italy;2. Department of Political Science, University of Roma Tre, Via G. Chiabrera 199, 00145 Rome, Italy;1. NICM Health Research Institute, Western Sydney University, Penrith, NSW 2750, Australia;2. Wentworth Institute, Surry Hills, NSW 2010, Australia;3. Florey Institute of Neuroscience and Mental Health, University of Melbourne, Australia |
| |
| Abstract: | Complexes of xanthine (xnH) with 3d metal perchlorates were prepared by refluxing mixtures of ligand and metal salt in ethyl acetate-triethyl orthoformate. In all cases, partial substitution of anionic xn− for ClO4− groups occurs, and the solid complexes isolated also contain invariably two neutral xnH ligands per metal ion, viz. Cr(xn)2(xnH)2ClO4, Fe(xn)2(xnH)2ClO4·H2O, M(xn)(xnH)2ClO4·H2O (M = Fe, Co, Ni) and M(xn)(xnH)2ClO4· 2H2O (M = Mn, Zn). The new complexes are generally hexacoordinated and appear to be linear chainlike polymeric species characterized by a (-Mxn-)n single-bridged backbone. Four terminal ligands per metal ion, including two xnH groups in all cases, complete its inner coordination sphere; the remaining two terminal ligands differ from complex to complex as follows: M = Cr3+ xn−, -OClO3; Fe3+ xn−, H2O; Fe2+, Co2+, Ni2+OClO3, H2O; Mn2+, Zn2+ two aqua ligands. Probable binding sites of bidentate bridging xn− and unidentate terminal xnH and xn− are discussed. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
