In Situ Electrochemical SFG/DFG Study of CN− and Nitrile Adsorption at Au from 1-Butyl-1-methyl-pyrrolidinium Bis(trifluoromethylsulfonyl) Amide Ionic Liquid ([BMP][TFSA]) Containing 4-{2-[1-(2-Cyanoethyl)-1,2,3,4-tetrahydroquinolin-6-yl]diazenyl} Benzonitrile (CTDB) and K[Au(CN)2]

Molecules

Benedetto Bozzini¹  Bertrand Busson¹  Audrey Gayral¹  Christophe Humbert¹  Claudio Mele¹  Catherine Six¹ 

[1] ¹Department of Innovation Engineering, University of Salento, via Monteroni, 73100 Lecce, Italy ²Physical Chemistry Laboratory, Paris-Sud University, CNRS, Bat 201P2, 91405 Orsay, France

关键词: 1-butyl-1-methyl-pyrrolidinium bis(trifluoromethylsulfonyl) amide;    4-{2-[1-(2-cyanoethyl)-1;    2;    3;    4-tetrahydroquinolin-6-yl]diazenyl} benzonitrile;    Au;    electrodeposition;    non-linear spectroscopy;    spectroelectrochemistry;    SFG;    DFG;   

DOI  :  10.3390/molecules17077722

来源: mdpi

【 摘 要 】

In this paper we report an in situ electrochemical Sum-/Difference Frequency Generation (SFG/DFG) spectroscopy investigation of the adsorption of nitrile and CN⁻ from the ionic liquid 1-butyl-1-methyl-pyrrolidinium bis(trifluoromethylsulfonyl) amide ([BMP][TFSA]) containing 4-{2-[1-(2-cyanoethyl)-1,2,3,4-tetrahydroquinolin-6-yl]- diazenyl}benzonitrile (CTDB) at Au electrodes in the absence and in the presence of the Au-electrodeposition process from K[Au(CN)₂]. The adsorption of nitrile and its coadsorption with CN⁻ resulting either from the cathodic decomposition of the dye or from ligand release from the Au(I) cyanocomplex yield potential-dependent single or double SFG bands in the range 2,125–2,140 cm⁻¹, exhibiting Stark tuning values of ca. 3 and 1 cm⁻¹ V⁻¹ in the absence and presence of electrodeposition, respectively. The low Stark tuning found during electrodeposition correlates with the cathodic inhibiting effect of CTDB, giving rise to its levelling properties. The essential insensitivity of the other DFG parameters to the electrodeposition process is due to the growth of smooth Au.

【 授权许可】

CC BY   
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.