Studies on the Deuteration at the Chiral Nitrogen of Bis(tropolonato) (N, N, N' -Trimethyl ethyl enediamine) Cobalt (Ⅲ) Complexes

Chem. J. Chinese Universities ›› 1992, Vol. 13 ›› Issue (3): 288.

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Studies on the Deuteration at the Chiral Nitrogen of Bis(tropolonato) (N, N, N' -Trimethyl ethyl enediamine) Cobalt (Ⅲ) Complexes

MA Gui-lin, XU Yi-ming

.Department of Chemistry, Yangzhou Teachers' College, Yangzhou, 225002

Received:1991-04-17 Online:1992-03-24 Published:1992-03-24

Abstract

Abstract: Bis(tropolonato)(N,N,N'-trimethylethylenediamine) Cobalt(Ⅲ) complex, [Co(tp)₂ (Me₃en)]ClO₄(Me₃en = N,N,N' -trimethylethylenediamine, tp=univalent anion of tropolone), was synthesized.The complex was purified and separated into two racemic pairs (△(R) (S) and △(S) (R)-isomers) by the ion exchange method.The rate constants of deuteration(kD) at the chiral nitrogen were measured by high-resolution ₁H NMRspectrometry.The value of k_D at 34.0℃ was 1.0×10⁵L·mol^-1·s^-1 for △(R) (S)-isomer and 1.8 × 10⁴ L·mol^-1·s^-1 for △(S) (R)-isomer.The factors which influence the deuteration are also discussed in this paper.

Key words: Cobalt complex, Troplone, N,N,N'-trimethylethylenediamine, Rate constant of deuteration

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MA Gui-lin, XU Yi-ming . Studies on the Deuteration at the Chiral Nitrogen of Bis(tropolonato) (N, N, N' -Trimethyl ethyl enediamine) Cobalt (Ⅲ) Complexes[J]. Chem. J. Chinese Universities, 1992, 13(3): 288.

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Studies on the Deuteration at the Chiral Nitrogen of Bis(tropolonato) (N, N, N' -Trimethyl ethyl enediamine) Cobalt (Ⅲ) Complexes

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