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Vibrational spectra of isotopically substituted metal carbonyls. IV: [1] Raman spectra of Mn ( 12 CO) 5 Br and Mn( 12 CO) 4 ( 13 CO)Br ( present in natural abundance ) at 15K
Author(s) -
Butler Ian S.,
Shaw C. Frank
Publication year - 1974
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.1250020305
Subject(s) - raman spectroscopy , chemistry , natural abundance , isotopic shift , infrared , analytical chemistry (journal) , abundance (ecology) , excitation , spectral line , isotope , manganese , methane , kinetic isotope effect , metal , nuclear magnetic resonance , atomic physics , deuterium , mass spectrometry , optics , physics , electrical engineering , organic chemistry , chromatography , quantum mechanics , astronomy , fishery , biology , engineering
The low temperature (15K) Raman spectrum of Mn(CO) 5 Br has been recorded under high resolution conditions in the 2150–1900 cm −1 and low frequency (below 700 cm −1 ) regions using Kr + laser excitation (647.1 nm). The spectrum indicates that there is no phase change between room temperature and 15K. Several Raman‐active CO stretching bands of the principal mono‐isotopic species Mn ( 12 CO) 4 ( 13 CO)Br present in natural abundance (1% axially substituted and 4% equatorially substituted) have been observed for the first time and assigned on the basis of a CO‐factored force field calculation. The reasons why it is felt that bands due to dilute isotopic species such as 13 CO are not observed routinely in the Raman, in contrast to the infrared, are discussed.