Table 1.

Relative change in leakage current measured in 0.1 M K₃Fe(CN)₆ after functionalization of the probes. Numbers <1 correspond to a decrease in leakage on functionalization.

	Change in
Reagent	leakage (nA)	N
1-Octanethiol in toluene	4.8 ± 4	7
4-Mercaptobenzamide in methanol	0.1 ± 0.1	2
4-Mercaptobenzamide in methanol	1.6 ± 1.6	6
4(5)-(2-Thioethyl)imidazole-2-carboxamide in ethanol	1.0	1
4(5)-(2-Thioethyl)imidazole-2-carboxamide in ethanol	0.6 ± 0.7	7