Electrochemical reduction of SPR-catalysate 4,4′-dimercaptoazobenzene at [BMIm]BF4/Ag interface probed by SERS

摘要: The surface plasmon resonance (SPR) catalyzed reaction has attracted considerable attention due to its promising application in heterogeneous catalysis. acquirements on mechanism of the conversion are still challenge. It was found that cyclic para-aminothiophenol (PATP) and 4,4′-dimercaptoazobenzene (DMAB) critically dependent interfacial environments, such as hydrogen, oxygen water, which were fundamental issues electrochemistry. Here, situ enhanced Raman spectroscopy (SERS) combined with electrochemical control developed investigate PATP DMAB at interface [BMIm]BF4/Ag electrode probe structure water. surface-catalyzed coupling commonly occurred produce a fast rate illumination laser. results revealed water played vital role reduction DMAB. expected absent extremely negative potential lack free “dried” [BMIm]BF4. similar experiments performed [BMIm]BF4/H2O mixtures molar fraction 0.01, 0.1, 0.3, 0.5, 0.7 0.9 respectively. trace mixture (xw < 0.1) mainly mixed RTILs through hydrogen bonding between RTILs. hindered diffusion resulted absence With increase content, formation clusters network allowed facilitate reduction. behavior aqueous solution completely surrounded by larger solutions high content = 0.7–0.9). By this strategy, could be served monitor mixtures, it believed SERS powerful tool for monitoring resolve RTILs, particularly structure.