title: Resonance Raman spectra of N-deprotonated sigma-type dianion of porphycenes.
abstract: Resonance Raman spectra of N-deprotonated sigma-type dianion of porphycenes were measured in an effort to characterize the structural changes concomitant with N-deprotonation. The observed resonance Raman behavior was consistent with the results of vibrational analysis by quantum chemical calculations based on density functional theory methods. Resonance Raman behavior predicted an expanded porphycene core for N-deprotonated sigma-type dianion with elongation of peripheral bond lengths. This sigma-type dianion is distinctive from pi-type dianion which has an expanded core with alternating changes in peripheral bond lengths.
authors.affiliation: Department of Chemistry, Virginia Commonwealth University, 1001 West Main Street, P.O. Box 842006, Richmond, VA 23284-2006, USA. mrabbani@vcu.edu
authors.forename: Mohammad Gulam
authors.initials: MG
authors.lastname: Rabbani
authors.forename: Junji
authors.initials: J
authors.lastname: Teraoka
mesh_terms: D011166:Porphyrins / Q000737:chemistry*; D011522:Protons; D011789:Quantum Theory; D013059:Spectrum Analysis, Raman
chemical_list: D011166:Porphyrins; D011522:Protons; C051407:porphycene