期刊
INORGANIC CHEMISTRY
卷 47, 期 24, 页码 11449-11451出版社
AMER CHEMICAL SOC
DOI: 10.1021/ic801626w
关键词
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资金
- Department of Energy (DOE), Office of Science [DE-AC02-06CH11357]
- NIH
- NCRR
- BTP
- BER [5 P41 RR001209]
This Communication addresses a long-standing problem: the exact vibrational assignments of the low-energy modes of the Fe-N-O subunit in six-coordinate ferrous heme nitrosyl model complexes. This problem is addressed using nuclear resonance vibrational spectroscopy (NRVS) coupled to (NO)-N-15-O-18 isotope labeling and detailed simulations of the obtained data. Two isotope-sensitive features are identified at 437 and 563 cm(-1). Normal coordinate analysis shows that the 437 cm(-1) mode corresponds to the Fe-NO stretch, whereas the 563 cm(-1) band is identified with the Fe-N-O bend. The relative NRVS intensities of these features determine the degree of vibrational mixing between the stretch and the bend. The implications of these results are discussed with respect to the trans effect of imidazole on the bound NO. In addition, a comparison to myoglobin-NO (Mb-NO) is made to determine the effect of the Mb active site pocket on the bound NO.
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