Heterocyclic quinones as core units for redox switches: UV–vis/NIR, FTIR spectroelectrochemistry and DFT calculations on the vibrational and electronic structure of the radical anions

An oxygen amperometric gas sensor based on its electrocatalytic reduction in room temperature ionic liquids

“…Voltammograms recorded after that 1 mol of electrons per mol of THTDP-AQS was spent in this reduction showed that the first cathodic peak was nearly no longer present. Concomitantly, the original band at 320 nm was significantly lowered in the corresponding absorption spectrum while new absorption bands were present, centred at about 400 and 560 nm, due to the electrochemically generated anion radical [47].…”

“…Before electrolysis, the UV-vis spectrum displayed an absorption band at about 325 nm, typical of the 9,10-anthraquinone p ? p à transition [47]. During exhaustive electrolysis at À0.85 V vs. a Pt pseudo-reference electrode (ca.…”

In situ FTIR spectroelectrochemistry and spectral simulations using DFT: Efficient complementary tools to elucidate complex electrochemical mechanisms

“…The redox centers incorporated into crown ethers can be of two types, based on whether they undergo reduction to form anionic hosts (e.g. nitrobenzyl [1] or quinone [1][2][3]) or oxidation to form cationic hosts (e.g. ferrocene [4] or tetrathiafulvalene [5]).…”

On the oxidation of Wurster’s reagent and the Wurster’s crown analog of 15-crown-5 in the presence of alkali metal cations

“…The redox centers incorporated into crown ethers are of two types based on whether they undergo reduction to form anionic hosts (e.g. nitrobenzyl [1,2] or quinone [3][4][5]) or oxidation to form cationic hosts (e.g. ferrocene [6] or tetrathiafulvalene [7]).…”

“…As such, this class of hosts offers the opportunity for strong mutual interaction between the redox center and guest in redox-switching and sensing applications. While a number of previous studies [1][2][3][4][5][6][9][10][11][12] have monitored the complexation ability of redox-active hosts through electrochemical measurements (primarily cyclic voltammetry), these data either do not or, typically, have not been used to provide detailed structural information. Electrochemical simulations of CV curves can be used to postulate reaction mechanisms but, in the absence of additional data, typically not used to confirm proposed mechanisms.…”