Preparation and crystal structures of trans-bis(imidato)bis(1,2-diphenylethylamine)copper(II) complexes (imidato=5,5-diphenylhydantoinato and succinimidato). Particular boundary cases of coordination geometry and monodentateligand conformation
T. Akitsu et al., Preparation and crystal structures of trans-bis(imidato)bis(1,2-diphenylethylamine)copper(II) complexes (imidato=5,5-diphenylhydantoinato and succinimidato). Particular boundary cases of coordination geometry and monodentateligand conformation, INORG CHIM, 315(1), 2001, pp. 18-25
Two new copper(II) complexes, trans-[Cu(phent)(2)(R-diphenea)(S-diphenea)].
2CHCl(3) (1) and trans-[Cu(succim)(2)(R-diphenea)(S-diphenea)] (2) (phent
= 5,5-diphenylhydantoinate, succim = succinimidate, and diphenea = 1,2-diph
enylethylamine) were prepared and crystal structures were determined. Never
theless both complexes have the same diphenea ligands, 1 affords a distorte
d square planar [CuN4] coordination with imidate and amine trans-N-Cu-N bon
d angles 156.6(2) and 161.4(2)degrees, while 2 affords a square planar [CuN
4] coordination with both trans-N-Cu-N bond angle 180.0 degrees. Complex 2
was the first example of square planar [CuN4] complexes with 1-phenyl subst
ituted ethylamine derivatives. Structural features are compared among 1, 2,
and previously reported distorted square planar trans-[Cu(phent)(2)(R-phen
ea)(S-phenea)] (3) and trans-[Cu(succim)(2)(R-phenea)(S-phenea)] (4) (phene
a = 1-phenylethylamine) complexes. The structural features suggest that the
[CuN4] coordination environment of 1 is distorted by particular edge-to-fa
ce arrangement of phenyl groups of amines and imidates which reasonably cor
responds to the most and the second stable conformation of diphenea ligands
with respect to rotation of two phenyl groups. (C) 2001 Elsevier Science B
.V. All rights reserved.