IR SPECTRA OF ORGANOPHOSPHINE SUBSTITUTED DERIVATIVES OF (HALOMERCURY)TETRACARBONYLCOBALT

Article abstract of DOI:10.1016/0022-2860(85)80149-6

The compounds XHgCo(CO)3L (X=Cl, Br) form dimeric donor-acceptor complexes of C_2h symmetry.The frequencies of the IR-active Co stretching vibrations of a series of compounds n (X=Cl, Br; n=1,2) are reported.The tendency towards dimerization decreases in the order L= P(tBu)3> P(OMe)3> P(OEt)3> EtP(OEt)2> Et2P(OEt)> Et2P(NEt2)>PEt3> P(nBu)3> EtP(NEt2)2> P(NEt2)3.The frequency lowering, due to dimerization, increases going from L= P(tBu)3 to L= P(NEt2)3.The force constants of the monomeric compounds XHgCo(CO)3L (X=Cl, Br) are calculated and compared with those of the dimeric compounds Hg2.