Table 3.

Comparison of Stark tuning rates measured at 80 K for nitriles in RNase complexes in 50% glycerol/water (self buffered at pH 7) and for relevant model compounds in 2-methyl-tetrahydrofuran. Error reported as standard deviation over 3 measurements.

Molecule	pCN-RNase	FMOC- pCN-Phea	mCN-RNase	FMOC- mCN-Phea	SCN-RNase	EtSCN
f•|ΔμCN| [cm−1/(MV/cm)]	0.59 ± 0.05	0.67 ± 0.01	0.60 ± 0.03b	0.61 ± 0.01	0.62 ± 0.04c	0.72 ± 0.03

^aFMOC stands for the fluorenylmethyloxycarbonyl group, attached to the amine

^bdetermined for the main (low energy) band only

^creproduced from previous study⁵⁴