Crystal structure of bis(4,4,5,5-tetramethyl-2-(thiophenal-2-yl)- imidazoline-1-oxyl-3-oxide)-bis(hexafluoroacetylacetonato)nickel(II), Ni(C11H15N2O2S)2[C3HO2(CF3)2]2 - Wang Xiao-Song (Zeitschrift für Kristallographie - New Crystal Structures, 2009)