Synthesis and Crystal Structure of Copper(II)-Hexafluoro-Acetylacetonate Complexes with Pyridyl-Substituted Nitronyl and Imino-Nitroxide Radicals

Abstract

A one-dimensional chain compound was formed by copper (II) hexafluoroacetylacetonate (hfac) and nitroxide radical 2-(4-pyridyl)-4,4,5,5-tetramethyl-imidazoline-1-oxyl-oxide (NITpPy). The product was structurally characterized by single crystal X-ray diffraction. [Cu2(hfac)4NITpPy] n crystallizes in the monoclinic C2/c space group with a = 19.70(2), b = 16.834(19), c = 15.274(18) A, β = 119.073, V = 4427(9) A3, Z = 4, R = 0.0699 wR 2 (all data) = 0.1752. In the compound, two different Cu(hfac)2 units are bridged by NITpPy. The nitrogen atom of pyridine ring is coordinated with Cu(II) ion to afford a three-spin complex. Cu(II) ions of Cu(hfac)2 and the oxygen atoms of nitronyl nitroxide formed weak coordination bonds with the bond length 2.495(8) A. A one-dimensional chain compound [Cu2(hfac)4NITpPy]n was formed by copper (II) hexafluoroacetylacetonate (hfac) and nitroxide radical 2-(4-pyridyl)-4,4,5,5-tetramethyl-imidazoline-1-oxyl-oxide (NITpPy). In the compound, two different Cu(hfac)2 units are bridged by NITpPy forming a 1D zigzag chain with the weak coordination bond Cu–O bond length 2.495(8) A.