Metal Isotope Effects on the Vibrational Spectra of [Bis(glycylglycinato)calcium Chloride]n

Junichi Odo, Marumi Arima, Masaki Mifune, Yutaka Saito, Akimasa Iwado, Yoshimasa Tanaka, Noriko Motohashi

Research output: Contribution to journalArticlepeer-review


The infrared and Raman spectra of [bis(glycylglycinato)calcium chloride] „ and its isotopic complexes containing metal and hydrogen isotopes have been measured. A large isotope shift of more than 4 cm _ 1 on 40Ca and 44Ca substitution has been observed in the infrared-active bands at 345, 267 and 242cm-1. These bands have been assigned to Ca-O antisymmetric stretching vibrations. The Raman-active bands at 305, 158 and 111 cm-1 have been assigned to Ca-O symmetric stretching vibrations with no displacement of the calcium atom. The result of a normal coordinate analysis is consistent with both the empirical assignments and the experimental isotope shifts. These results indicate that Ca-ligand bond forces are almost similar to those of copper- and zinc-amino acid complexes.

Original languageEnglish
Pages (from-to)251-254
Number of pages4
JournalChemical and Pharmaceutical Bulletin
Issue number2
Publication statusPublished - 1991


  • Ca-Ca substitution
  • Raman spectra
  • [bis(glycylglycinato)calcium chloride]
  • amino acid
  • calcium complex
  • deuteration
  • glycylglycine
  • infrared spectra
  • metal isotope effect
  • normal coordinate analysis

ASJC Scopus subject areas

  • Chemistry(all)
  • Drug Discovery


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