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Resonance Raman studies of 1,2,3,4,5,6,7,8‐octamethylporphin, 1,3,5,7‐tetramethylporphin, and mesotetraphenylporphin and its Ni‐, Cu‐, and Pd‐chelates
Author(s) -
Mendelsohn R.,
Sunder S.,
Bernstein H. J.
Publication year - 1975
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250030217
Subject(s) - raman spectroscopy , molecule , chemistry , resonance (particle physics) , chelation , infrared , depolarization ratio , symmetry (geometry) , analytical chemistry (journal) , solid state , crystallography , nuclear magnetic resonance , inorganic chemistry , physics , organic chemistry , atomic physics , optics , geometry , mathematics
Resonance Raman spectra are reported for 1,2,3,4,5,6,7,8‐octamethylporphin, 1,3,5,7‐tetramethylporphin and mesotetraphenylporphin and its Ni‐, Cu‐, and Pd‐chelates. Comparison of infrared and Raman data for the non‐metallo compounds provides evidence that mesotetraphenylporphin loses its centre of symmetry in the solid state while the other two molecules retain theirs. Depolarization ratio measurements for Ni‐tetraphenylporhin in CS 2 solution reveal the presence of several anomalously polarized vibrations (ϱ > ¾). Evidence is presented to show that the symmetry of the molecule in solution has been reduced from D 4 h .