Manganese(II), cobalt(II) and nickel(II) complexes constructed from a pyridyloxy-functionalized hexapodal cyclophosphazene ligand: Structural and magnetic studies

Abstract

Herein, the coordination behaviour of a hexapodal building block, 2,2,4,4,6,6-hexakis((6-methylpyridin-3-yl) oxy) cyclotriphosphazene (MeHPCP), towards divalent metal ions (Mn, Co and Ni) is described. Three new coordination compounds, namely the molecular complex [Mn(MeHPCP)(Cl)(2)(H2O)(2)] (1) and the onedimensional (1D) zig-zag chain coordination polymers {Co-2(MeHPCP)(Cl)(4)(H2O)(2)](MeCN)(H2O)(3)} n (2) and {[Ni(MeHPCP)(Cl)(2)(H2O)]} n (3), were structurally characterized by FT-IR spectroscopy and single crystal X-ray diffraction analysis. Thermogravimetric analyses show that all the compounds have high thermal stability (>350 degrees C). The magnetic properties of 2 and 3 were analyzed by electron spin resonance (ESR) and the physical properties measurement system (PPMS) technique and these complexes exhibited paramagnetic behavior.