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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 15, Number 8
BKCSDE 15(8)
August 20, 1994 

Diaminoplatinum(Ⅱ) Complexes of Glutamic Acid : Obvious Chelating Isomerization
Young-A Lee, Jongki Hong, Ok-Sang Jung*, Youn Soo Sohn*
Coordination isomers of cis-(N-N)Pt(Glu) prepared by reaction of cis-(N-N)Pt(SO4) (N-N=2NH3, ethylenediamine(en),(R,R)-1,2-diaminocyclohexane (DACH), N,N,N',N'-tetramethylethylenediamine (TMEDA)) with barium glutamate in water have been monitored and characterized by 1H-NMR, 13C-NMR, IR, and mass spectra. The reaction at room temperature affords the mixture of O,O'-and N,α O-chelated platinum(Ⅱ) complexes. The O,O'-chelate initially formed isomerized to N,α O-chelate on standing for a long time or increasing temperature. The ratio of the two isomers at room temperature depends on the nature of the nitrogen donor coligand (N-N).
669 - 673
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