SYNTHESIS AND STRUCTURE OF DIAMINE-SUBSTITUTED BUTENE-2-OLIDE-4-YLIDENE-4-COBALT CARBONYL-COMPLEXES

Several diamine-substituted cobalt carbonyl butenolide complexes of th e type Co-2(H,R,C4O2)(mu(2)-CO)(CO)(4)(L-L)[R=H or (n)Bu; (L-L)=N,N,N' ,N'-tetramethylethylenediamine (tmeda), 1,2-diamino cyclohexane (dach) cis- and trans-isomers, o-phenylene diamine (opda), 1,10-phenanthroli ne (phen), or 2,2'-dipyridyl (dipy)] have been prepared. The structure s of three representatives [R=H, (L-L)=tmeda (1); R=(n)Bu, (L-L)=phen (8b) and dipy (9)] have been determined. Complexes 1, 8b and 9 crystal lise in triclinic P ($) over bar 1 (a=7.442(2), b=9.159(2), c=14.182(3 ) Angstrom, alpha=79.34(3), beta=82.34(3), gamma=70.07(3)degrees), mon oclinic P2(1)/c (a=10.953(2), b= 16.464(4), c=14.537(3) Angstrom, beta =110.47(2)degrees) and monoclinic P2(1)/n (a=9.698(6), b=15.508(6), c= 15.966(8) Angstrom, beta=79.30(4)degrees) space groups, respectively. The complexes with tmeda and trans-dach are the first stable cobalt ca rbonyl derivatives containing saturated aliphatic amines as ligands.