New examples of mixed-ligand bis(hexafluoroacetylacenonato)copper(II) complexes with 3-imidazoline nitroxide radicals at a Cu(C5HF6O2)2∶L=3∶2 ratio (L2=C14H19N2O, L3=C13H17N2O3)

Abstract

The crystal structures of two (hexafluoroacetylacetonato)copper(II) complexes with 3-imidazoline nitroxide radicals, [Cu(C5HF6O2)2]3 (C14H19N2O)2 (I) and [Cu(C5HF6O2)2]3 (C13H17N2O3)2 (II), have been determined. The compounds are triclinic (PI, Z=1) with a=8.730(2), b=10.357(2), c=21.996(5) A, α=103.24(2), β=94.03(2), γ=95.04(2)0, V=1920(1) A3 for I and a=8.679(2), b=14.769(4), c=15.368(4) A, α=85.58(2), β=96.25(1), γ=104.60(1)0, V=1893(1) A3 for II. Complexes I and II are molecular. The trinuclear molecules are centrosymmetric relative to the Cu(1) atom. The coordination polyhedron of Cu(1) is a square bipyramid formed by the O atoms of the hfac anions and nitroxide radicals (average Cu−Ohfac 1.92(1) for I and 1.93(1) A for II; Cu−ON−O 2.47(1) for I and 2.56(1) A for II). The coordination polyhedron of Cu(2) is a trigonal bipyramid formed by the O atoms of the hfac anions (Cu−Ohfac 1.91(1)–2.12(1) for I and 1.91(1)–2.09(1) A for II) and an imine N atom of the radical (Cu(2)−N(2) 2.00(1) for I and 2.03(1) A for II). The molecules are linked by van der Waals forces.