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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 19, Number 4
BKCSDE 19(4)
April 20, 1998 

 
Title
Synthesis and Crystal Structure of Cobalt(III) Complex with Chiral Pentadentate Bis-Amide Ligand, 1,9-bis(S)-pyrrolidinyl-2,5,8-triazanonane-1,9-dione(S,S-prodienH2)
Author
Bae-Wook Lee, Chang-Eon Oh, Myung-Ki Doh*
Keywords
Abstract
A chiral pentadentate bis-amide ligand, 1,9-bis(S)-pyrrolidinyl-2,5,8-triazanonane-1,9-dio ne(S,S-prodienH2) has been synthesized from the reaction of bis(2-aminoethyl)amine(dien) and S-proline, and the structure of [Co(S,S-prodien)H2O]ClO4 has been determined by single crystal X-ray diffraction. The geometrical structure of the Co(III) complex has been an αβ -form, where the dien moiety of ligand chelates to a facial in metal center, and the aqua ligand coordinates a cis site to the secondary nitrogen of dien. The Co-N(1), Co-N(3) distances of two amide moiety in S,S-prodien are shorter than the other Co-N(2), Co-N(4), and Co-N(5) distances because of the increased basicity of nitrogen in amide. The complex crystallizes in the monoclinic space group P21(#4), with a=7.838(1), b=12.675(1), c=9.710(1) Å, β=100.39(1) and z=2. Refinement gives the final R and Rw values of 0.045 and 0.057, respectively for 2130 observed reflections. Based upon the CD and X-ray data, it is identified that the absolute configuration of theαβ -[Co(S,S-prodien)H2O]ClO4 has a Λ-form.
Page
457 - 462
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