Structure and Magnetic Properties of a Chain Complex with Alternating Ru(II,III) Dimer and Nitroxide Radical Arrangement [Ru2(O2CCMe3)4(nitph)]<i>n</i>(BF4)<i>n</i>, nitph = 2-Phenyl-4,4,5,5-tetramethyl-4,5-dihydro-1<i>H</i>-imidazol-1-oxyl 3-<i>N</i>-Oxide

Abstract

Abstract A chain complex of diruthenium(II,III) cation dimer linked by a nitroxide radical, [Ru2(O2CCMe3)4(nitph)]n(BF4)n (nitph = 2-phenyl-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazol-1-oxyl 3-N-oxide), has been prepared and characterized. The structure with an alternating alignment of Ru(II,III) core and nitph has been confirmed by the X-ray crystal analysis. The magnetic moment decreased steadily with decrease of temperature, against the expectation of ferrimagnetic behavior based on the alternated alignment of S1 = 3/2 (for Ru(II,III) core) and S2 = 1/2 (for nitph). It has been found that the zero-field splitting plays an important role in the magnetic behavior in addition to the interaction between the Ru(II,III) core and nitph.