Metal Isotope Effects on the Vibrational Spectra of Polymeric Metal Complexes. V. Infrared Spectra of Bis (L-and DL-phenylalaninato) copper (II)

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The infrared spectra of bis (L-and DL-phenylalaninato) copper (II) and their N-deuterated analogues have been recorded in the region between 4000 and 200cm^<-1>. The vibrational assignments of the Cu-ligand stretching vibrations have been made by means of the metal isotope technique, ^<63>Cu and ^<65>Cu substitution. Three bands of trans-bis (L-phenylalaninato) copper at 400,380,and 339cm^<-1> shift appreciably on ^<63>Cu-^<65>Cu substitution. The blue isomer of bis (DL-phenylalaninato) copper also shows three copper isotope-sensitive bands at 380,340,and 328cm^<-1>, analogous to those of trans-bis (D-alaninato)-and (L-phenylalaninato) copper. However, the blue-violet isomer of the DL complex shows only two sensitive bands at 370 and 322cm^<-1>, as in the case of cis-bis (D-alaninato) copper. Frequency shifts on N-deuteration suggest that one of the Cu-N stretching vibrations is at higher frequency than the Cu-O stretching vibrations for bis (L-phenylalaninato) copper, but this frequency order is reversed for the two isomers of bis (DL-phenylalaninato) copper, but this frequency order is reversed for the two isomers of bis (DL-phenylalaninato) copper.
公益社団法人日本薬学会の論文
1983-11-25