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. Author manuscript; available in PMC: 2011 Dec 15.
Published in final edited form as: Biochemistry. 2010 Nov 17;49(49):10354–10356. doi: 10.1021/bi101711a

TABLE 1.

Band position (ν), full width at half maximum (Δν), and the estimated molar extinction coefficient (ε) of the C≡N stretching vibration of various probes in H2O and THF.

Probe 1 2 3 4
ν(cm−1, H2O) 2236.6 2240.3 2233.7 2237.9
Δν(cm−1, H2O) 11.8 14.4 11.2 16.4
ν(cm−1, THF) 2228.5 2232.3 2226.8 2229.6
Δν(cm−1, THF) 7.4 7.8 6.1 7.1
ε (M−1cm−1) 210 ± 60 22 ± 10 240 ± 60 24 ± 10