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Synthesis and crystal structure of the Sm(ButNCHCHNBut)z(bpy) complex T. V. Petrovskaya, a L L. Fedyushkin, a ,~t. N. Bochkarev, a" G. Shumann, b and IL Veimann b aG. A. RazuvaevReaction of Sm(bpy) 4 (bpy is 2,2"-bipyridyl) with di-tert-butyldiazabutadiene (dad) in tetrahydrofuran (THF) affords the mixed-ligand complex Sm(dad)2(bpy) (1). Complex I was isolated as black paramagnetic crystals readily soluble in THF. 1,2-dimethoxyethane (DIME), toluene, and ether. Compound I was characterized by IR and ESR spectroscopy, X-ray diffraction analysis, and by the results of magnetic measurements. Based on the difference between the Sm--N bond lengths and on the data of IR spectroscopy, the following formal charge distribution in the molecule of complex I was proposed: Sm3+(dad)2-(dad)l-(bpy) ~

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