Figure 4: Transition metal redox-state-dependent coordinative forces. | Nature Communications

Figure 4: Transition metal redox-state-dependent coordinative forces.

From: Direct measurement and modulation of single-molecule coordinative bonding forces in a transition metal complex

Figure 4

(a) Comparison of typical force-extension curves for interactions between Os–terpy-C6-S-Au(111) substrates and terpy-C6-S-tips (that is, configuration II) at different working potentials (versus SCE) of +185 mV (fully oxidized state), −15 mV (partially reduced but close to the equilibrium form) and −215 mV (fully reduced form). The LR was 200 nm s−1. (b–d) Corresponding histograms of coordination force distributions. The average force based on statistical analyses is: (b) 130±60 pN (n=292) at +185 mV, (c) 100±30 pN (n=250) at −15 mV and (d) 80±30 pN (n=328) at −215 mV. (e) The dependence of average unbinding forces on the redox states controlled by the working potentials; the data used are the average values of three or four sets of independent experimental measurements.

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