Vol. 86 Fig. 10.-Rotatory dispersion curve of the L-histidine-copper complex resolved into a simple Cotton effect and a Cotton effect similar to those of the cobalt, nickel, and zinc complexes.the many-electron model to this chromophoric electron. Looking at complex I (imidazole plane), it would be reasonable to take the most polarizable 2-direction in the direction of charge transfer. The y-direction would be in the imidazole plane and the x-direction would be perpendicular to that plane. All of the groups lie in H Complex I (imidazole plane) or very near a plane except the carboxylate anion which is clearly the principal perturbation of the "chromophoric ellipsoid.'' As it is a negative group, the product Axyz would be positive in this direction, that is, the static charge effect is assumed to be dominant, and as xyz is negative, must be negative, i.e., a negative Cotton effect might be expected. Figure 10 shows that the curve for the L-histidinocopper(II) can be resolved into a curve similar to those of the other transition metals and a negative Cotton effect curve.Acknowledgment.-The authors express appreciation to the National Science Foundation under Grant GP-415 for financial support of this research and to Dr. D. J. Caldwell for helpful discussions on theoretical aspects of optical rotation.

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