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Existence of 1D spin diffusion in the electrochemical sugar recognitionsystem consisting of a nano-sized gold particle (GNP), a ruthenium complex anda phenylboronic acid was investigated by NMR and muSR. When sugar molecules arerecognized by the phenylboronic site, the response of electrochemicalvoltammetry of the Ru site changes, enabling the system to work as a sensitivesugar-sensor. In this recognition process, the change in the electronic stateat the boron site caused by sugar must be transferred to the Ru site via alkylchains. We have utilized the muon-labelled electrons method and the proton NMRto find out a channel of the electron transfer from the phenylboronic acid siteto the gold nano particle via the one dimensional alkyl chain. If this transferis driven by diffusive spin channel, characteristic field dependence isexpected in the longitudinal spin relaxation rate of muSR and 1H-NMR. We haveobserved significant decrease in the spin relaxation rates with increasingapplied field. The result is discussed in terms of low dimensional spindiffusion.

Electron transfer channel in the sugar recognition system assembled on nano gold particle