# POLARIZATION OF THE ELECTRONIC TRANSITIONS OF A SYNTHETIC CORRIN ANALOG

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 Title: POLARIZATION OF THE ELECTRONIC TRANSITIONS OF A SYNTHETIC CORRIN ANALOG Creators: Eckhardt, Craig J.; Anex, Basil G. Issue Date: 1966 Publisher: Ohio State University Abstract: The fact that the corrin nucleus forms the central chromophoric group of vitamin $B_{12}$ has led to its electronic structure being the object of considerable study. The recent synthesis (A. Eschenmoser, R. Scheffold, E. Bertele, M. Pesaro and H. Gschwend, Proc. Roy. Soc. 288A, 306 (1965) ) and crystal structure determination (J. D. Dunitz and E. F. Meyer, Jr. Proc. Roy Soc. 288A, 324 (1965) ) of a nickel corrin analog have provided an ideal medium for a single-crystal spectral study. Polarized specular reflection spectra have thus been determined in the 10 to 47 kK region for two crystal faces and the corresponding absorption spectra obtained through Kramers-Kronig analyses. These results will be presented and the relationship of the experimental polarizations, intensities, and energies to the electronic structure of the molecule will be discussed in terms of various theoretical models. Description: This work has been partially supported by a grant from the National Institutes of Health. Craig J. Eckhardt is a National Institutes of Health Predoctoral Fellow. Author Institution: Sterling Chemistry Laboratory, Yale University URI: http://hdl.handle.net/1811/15007 Other Identifiers: 1966-G-2