Open AccessCu 2+ in Non Axial‐Field: A Model for Cu 2+ in Copper Enzymes
Author(s) -
Gould D. C.,
Ehrenberg A.
Publication year - 1968
Publication title -
european journal of biochemistry
Language(s) - English
Resource type - Journals
eISSN - 1432-1033
pISSN - 0014-2956
DOI - 10.1111/j.1432-1033.1968.tb00391.x
Subject(s) - copper , electron paramagnetic resonance , tetrahedron , crystallography , planar , enzyme , chemistry , field (mathematics) , electron , absorption (acoustics) , materials science , nuclear magnetic resonance , physics , biochemistry , mathematics , organic chemistry , pure mathematics , computer graphics (images) , quantum mechanics , computer science , composite material
By γ‐irradiation at 77° K of the Cu 1+ ‐containing organic crystals, Cu(CH 3 CN) 4 ClO 4 , Cu(HOOCCH 2 CH 2 CN) 4 ClO 4 , and Cu(CH 3 CN) 4 BF 4 , Cu 2+ centres in near‐tetrahedral field were produced. These Cu 2+ centres approximated the electron spin resonance characteristics (| A 1 |= 0.008 cm −1 ) and light absorption of Cu 2+ in Cu‐containing oxidoreductases. No exact correlation was found between the g ‐values of the model system and the Cu‐oxidases. It is suggested that the Cu site in these enzymes is intermediate between the square planar (normal for Cu 2+ ) and the tetrahedral (normal for Cu 1+ ) configuration, which makes it suited for rapid electron transport.