Amphiphilic Molecules of Nb18: Synthesis, Langmuir-Blodgett Films Construction and Applications in Electro-Catalysts

作者：Huang, Mei^*; Mao, Xiaoli; Chen, Dechao; He, Shulian; He, Shuai; Liu, Wenhong; Xu, Jinzhang; Miao, Shiding

来源：Journal of the Electrochemical Society, 2015, 162(4): H229-H234.

DOI：10.1149/2.0691504jes

• CHEMICALLY-MODIFIED ELECTRODES
• NILE BLUE DERIVATIVES
• ALKYL SIDE-CHAIN
• ELECTROCATALYTIC REDUCTION
• PHOTOPHYSICAL PROPERTIES
• HETEROGENEOUS CATALYST
• ZIRCONIUM-PHOSPHATE
• NADH OXIDATION
• RED
• DNA

A new type of Nile blue (Nb) derivative molecules terminated with long-chain alkyl (termed as Nb18) has been synthesized from precursors of barium stearate and 3-amino-7-(diethylamino)-1,2-benzophenoxazin sulfate. Optical characterizations including UV-Vis absorption, fluorescence emission, excitation spectra and the infrared spectroscopy reveal a blueshift in the band emission of Nb18 as compared to the Nb molecule, and this shift was found to be reasoned by incorporation of long-chain alkyl groups and replacement of SO42-. The amphiphilic Nb18 molecules were found to form stable Langmuir monolayers over aqueous solutions, and this allows one to study the kinetics of Nb18 formation by means of surficial chemistry. The synthetic reaction was demonstrated to have first-order kinetics with a rate constant of similar to 0.0033 s(-1). Using different techniques (Langmuir-Blodgett and Langmuir-Schaefer) monolayers of Nb18 were deposited on an electrode where the amphiphilic molecules were differently oriented. Investigation of these films undertaken to confirm some of the previous electrochemical observations indicated that the electro-catalytic activity stems from the cationic rings of aromatic oxazine regarding to the oxidation of dihydronicotinamide adenine dinucleotide (NADH).

• 出版日期2015
• 单位合肥工业大学