Acetonitrile hydration versus molybdenum oxidation at the sulfur-rich bimetallic site {Mo~(III)_2Cp_2(#mu#-SMe)_3}~+. Crystal structure of the #mu#-#eta#~1 : #eta#~1-amidato complex [Mo_2Cp_2(#mu#-MeCONH)(#mu#-SMe)_3]

摘要

The paramagnetic #mu#-amidato species [Mo_2Cp_2(#mu#-MeCONH)(#mu#-SMe)_3]BF_4 2a~+ (Cp = #eta#-C_5H_5) is formed exclusively when the comound [Mo_2Cp_2(#mu#-MeCONH)(#mu#-SMe)_3]BF_4 1a in powder form is kept in air, whereas the same starting complex in solution gives a mixture of the #mu#-amidato species and the #mu#-oxo comple [Mo_2Cp_2(#mu#-O)(#mu#-SMe)_3]BF_4 3. The oxo complex is formed quantitatively on warming [Mo_2Cp_2(#mu#-MeCONH)(#mu#-SMe)_3]BF_4 in water. The reduction of 2a~+ by NaBH_4 in CH_3CN affords the molecular product [Mo_2Cp_2(#mu#-MeCONH)(#mu#-SMe)_3] 2a which has been characterised by X-ray analysis.