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- W2056535417 abstract "Abstract The crystal and molecular structure of ΛΔ- cis-α-ethylenebis-α- RR/SS -aminobutyric acidato(1,2- diaminoethane)cobalt(III) perchlorate, ΛΔ- cis -α [Co( RR/SS -EBABA)(en)]ClO 4 , was determined from three-dimensional X-ray counter data. The complex crystallizes in the monoclinic system, space group P 2 1 / n with a = 8.514(5), b = 19.482(9), c = 11.610(6) A, β = 109.70(4)°, V = 1813(1) A 3 . For Z = 4, the observed and calculated densities are 1.64(1) and 1.644 g cm −3 , respectively. The structure was refined by block-diagonal least-squares technique to a final R = 0.062 for 1661 observed reflections. The geometry about the cobalt atom is roughly octahedral with the tetradentate RR/SS -EBABA, assuming cis -α configuration in which the complex possesses two out-of-plane amino acidate (R) rings and the backbone ethylenediamine (E) ring. The E ring conformation is δ for the Δ- cis -α isomer and λ for the Λ- cis -α isomer, respectively. On the other hand, both R rings have an asymmetric envelope conformation while the en ring has a δ conformation. As the crystal structure is centrosymmetric, it consists of a racemic mixture of Λ- S N S N -(λ E -e R 1 -e R 2 - (δ en - cis -α-[Co( RR -EBABA)(en)] + and Δ- R N R N -(δ E - e R 1 -e R 2 )- cis -α-[Co( SS -EBABA)(en)] + enantiomers as paired complex cations. Thus the X-ray diffraction experiment has revealed stereospecific formation of both cations due to intra- and interligand interactions." @default.
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- W2056535417 date "1989-06-01" @default.
- W2056535417 modified "2023-09-27" @default.
- W2056535417 title "Crystallographic evidence of substituent induced stereospecificity in mixed ligand complexes of amino acid derivatives" @default.
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- W2056535417 doi "https://doi.org/10.1016/s0020-1693(00)80597-6" @default.
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