Synthesis, structure, and characterization of the diimido-bridged, bimetallic molybdenum(V) complex oxobis[(diethyldithiocarbamato)(.mu.-2-aminothiophenolato)molybdenum(V)]-bis(dichloromethane), (dtc)MoO(.mu.-NC6H4S)2Mo(dtc).2CH2Cl2, and of the precursor in the formation of this bimetallic molybdenum(V) complex, bis(diethyldithiocarbamato)(2-aminothiophenolato)(methoxy)molybdenum(VI), Mo(NC6H4S)(OCH3)(dtc)2