Journal of the Chemical Society, Dalton Transactions p. 2225 - 2230 (1992)
Update date:2022-08-04
Topics:
Munakata, Megumu
Kitagawa, Susumu
Kawada, Ichiro
Maekawa, Masahiko
Shimono, Hisao
Ternary copper(I) complexes with alkynes and 1,10-phenanthroline (phen) have been prepared and characterized by their formation constants, IR spectra, 1H and 13C NMR spectra.The structures of three complexes, a trigonal-planar arrangement.The alkyne is sideways bonded onto the copper atom.The C<*>C bond distances of 1.190(7) (1), 1.218(13) (2) and 1.193(10) Angstroem (3) are slightly longer than those of the free alkynes and indicate that ? back donation from copper to the alkyne is weak.The reduction of the C<*>C stretching frequency for metal-alkyne complexes is correlated to the acetylenic bend-back angles and the lengthening of the C<*>C distance of the alkyne upon co-ordination.The copper-carbon and -nitrogen distances for 1 and 2 are essentially the same as those for the corresponding olefin complexes.
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