SYNTHESIS OF MONOSUBSTITUTED PENTAKIS(2,6-DIETHYLPHENYLISOCYANIDE)COBALT(I) COMPLEXES WITH BIDENTATE TERTIARY PHOSPHINE-LIGANDS .2. BIMETALLIC COMPLEXES

Reaction of bidentate tertiary phosphines with excess [Co(CNR)(5)]BF4, or reaction of [Co(CNR)(4)L- L]BF4 with excess [Co(CNR)(5)]BF4, leads to bimetallic complexes of the form, [(RNC)(4)CoL- LCo(CNR)(4)](BF4)2, R=2,6-Et(2)C(6)H(3), L-L= p-Ph(2)PC(6)H(4)PPh(2), Ph(2)PC drop CPPh(2), Me(2)PCH(2)CH(2)PMe(2), Ph(2)PCH(2)CH(2)PPh(2), Ph(2)PCH(2)CH(2)CH(2)PPh(2). Comparison of the V(-N drop C) IR patterns, electronic spectra, and molar conductivity values of these bimetallic complexes with data for other Co(I)organoisocyanide complexes indicates that the two -Co(CNR)(4) moieties are almost totally independent of each other. Recorded lambda(max) values are the same as for the [Co(CNR)(4)L-L]BF4 complexes, but the epsilon values, although very large, are less than double. A(M) values in acetone, and probably also in CH2Cl2, are better interpreted as twice the normal conductivity for 1:1 electrolytes than conductivity for 2:1 electrolytes.