Molecules 2012, 17(7), 7722-7736; doi:10.3390/molecules17077722
Article

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]

1 Department of Innovation Engineering, University of Salento, via Monteroni, 73100 Lecce, Italy 2 Physical Chemistry Laboratory, Paris-Sud University, CNRS, Bat 201P2, 91405 Orsay, France
* Author to whom correspondence should be addressed.
Received: 21 March 2012; in revised form: 22 May 2012 / Accepted: 23 May 2012 / Published: 25 June 2012
(This article belongs to the Special Issue Ionic Liquids)
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Abstract: 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 cm1, exhibiting Stark tuning values of ca. 3 and 1 cm1 V1 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.
Keywords: 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

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MDPI and ACS Style

Bozzini, B.; Busson, B.; Gayral, A.; Humbert, C.; Mele, C.; Six, C.; Tadjeddine, A. 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 2012, 17, 7722-7736.

AMA Style

Bozzini B, Busson B, Gayral A, Humbert C, Mele C, Six C, Tadjeddine A. 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. 2012; 17(7):7722-7736.

Chicago/Turabian Style

Bozzini, Benedetto; Busson, Bertrand; Gayral, Audrey; Humbert, Christophe; Mele, Claudio; Six, Catherine; Tadjeddine, Abderrahmane. 2012. "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 17, no. 7: 7722-7736.

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