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. Author manuscript; available in PMC: 2020 Apr 28.
Published in final edited form as: Biochim Biophys Acta Bioenerg. 2017 Sep 29;1859(1):8–18. doi: 10.1016/j.bbabio.2017.09.006

Table 4.

CO and CN stretching frequencies (cm−1) of IR-spectroscopically observed HtSH [NiFe] active site species.

Assignment ν(CO) ν(CN)
n/aa 1993 2081 2090
Nir-B-like 1964 2087 2098
Nir-S 1936 2058 2071
Nia-S 1951 2076 2089
Nia-C 1971 2076 2089
Nia-SR 1958 2062 2076
Nia-SR’ 1943 2048 2062
Nia-SR” 1934 2048 2062
a

Not assigned. Oxidized active site species of unknown structure