Synthesis and X-ray structures of manganese(I) and rhenium(I) formato complexes, fac-(CO)3(dppp)MOC(H)O
2000
Abstract The mononuclear manganese(I) and rhenium(I) formato complexes, fac -(CO) 3 (dppp)MOC(H)O (M=Mn, 1 ; M=Re, 2 ), have been prepared from fac -(CO) 3 (dppp)MH and formic acid, and their X-ray structures determined. Compounds 1 and 2 are unusual in that the formato ligands are bound in a terminal, monodentate fashion. For Mn, only multinuclear complexes containing bridging formato ligands have been characterized previously by X-ray diffraction. The MO bond lengths and MOC bond angles are 2.043(2) A and 124.2(2)°, respectively for 1 and 2.167(3) A and 122.3(3)°, respectively for 2 . Compounds 1 and 2 can also be decarboxylated at elevated temperatures with quantitative recovery of fac -(CO) 3 (dppp)MH.
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