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Nature of Cu(II)-poly(glutamic acid) complex in aqueous solution

✍ Scribed by Hiroko Takesada; Hideo Yamazaki; Akiyoshi Wada

Publisher: Wiley (John Wiley & Sons)
Year: 1966
Tongue: English
Weight: 460 KB
Volume: 4
Category: Article
ISSN: 0006-3525
DOI: 10.1002/bip.1966.360040702

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✦ Synopsis

Complex formation of poly(g1utamic acid) with cupric ions in aqueous solution was investigated by three different methods: optical spectroscopy, optical rotatory dispersion, and electron spin resonance. Formation of a characteristic complex wm found to occur in a p H region suitable for the helix-coil transition. An analysis of the ESR spectrum of the complex is given, and the results of calculation of bonding parameters suggest that the bond between copper and nitrogen atoms had an appreciably covalent character. The change in the secondary structure of the polymer as a result of complex formation is discussed.

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