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KMID : 1059519970410090465
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Journal of the Korean Chemical Society
1997 Volume.41 No. 9 p.465 ~ p.470
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Stereospecific Reaction of S,S-prodien(=1,9-bis(S)-prolyl-1,9-dioxo-2,5,8-triazanonane) (Ⅰ); Synthesis of Λ-α β(ffm)-[Co(S,S-prodien)H2O]ClO4
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Lee Bae-Wook
Kim Jin-Woo
Lee Dong-Jin
Kim Bong-Gon
Oh Chang-Eon
Doh Myung-Ki
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Abstract
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A chiral pentadentate ligand, 1,9-bis(S)-prolyl-1,9-dioxo-2,5,8-tri-azanonane, (S,S-prochen) which shows the stereospecific reaction was synthesized from the reaction of S-proline and diethylenetriamine (dien). The red-violet [Co(S,S-prodien)H2O]ClO4 was prepared by the oxidation of the aqueous solution dissolving COCl2·6H2O and S,S-prodien. Elemental analysis, electronic absorption spectroscopy, and 13C-NMR spectroscopy suggest that the geometrical structure of the Co(Ⅲ) complex to be an α β (ffm) form, where the dien moiety of the ligand chelates the metal center to comprise a facial isomer, and an aqua ligand coordinates a cis site to the secondary nitrogens of the dien. Based upon the CD spectroscopic analysis, it seems that the absolute configuration of the α β (ffm)-[Co(S,S-prodien)H2O]ClO4 has the Λ-form.
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