Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
Preparation, Crystal Structure, and Stereochemical Properties of {N,N′-Ethylenebis(1,1,1-trifluoro-4-imino-2-pentanonato)} (L-methioninato)cobalt(III)
Ken-ichi OkamotoKatsuhiro MatsutaniYuki Fujii
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1985 Volume 58 Issue 12 Pages 3486-3491

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Abstract

The (−)435 isomer of the {N,N′-ethylenebis(1,1,1-trifluoro-4-imino-2-pentanonato)}(L-methioninato)cobalt(III) complex, (−)435-[Co(tfac2en)(L-met)], was preferentially crystallized from an equilibrium mixture of the (−)435 and (+)435 isomers in methanol. The crystal structure of the (−)435 isomer was determined by X-ray diffraction. The (−)435 isomer is of a Λ-cis-β2 type in which the quadridentate tfac2en takes a nonplanar configuration, and the L-methioninate is bound to the cobalt atom by nitrogen and oxygen atoms as a bidentate ligand. The electronic absorption, CD, and 1H NMR spectral behaviors of both (−)435 and (+)435 isomers are discussed in relation to their geometrical and absolute configurations.

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