The voltammetry of surface bound 2-anthraquinonyl groups in room temperature ionic liquids: Cation size effects

TY - JOUR

T1 - The voltammetry of surface bound 2-anthraquinonyl groups in room temperature ionic liquids

T2 - Cation size effects

AU - Ernst, Sven

AU - Aldous, Leigh

AU - Compton, Richard G.

PY - 2011/8/5

Y1 - 2011/8/5

N2 - A glassy carbon microelectrode has been modified with multilayer films of 2-anthraquinonyl groups (AQL), and characterised in three different room temperature ionic liquids (RTILs). The electroactivity of the anthraquinonyl films was found to vary with the size of the RTIL cation, in that the extent of the AQL-/AQL2- reduction was found to decrease with increasing cation size. Two distinct one-electron redox waves were observed in RTILs composed of smaller cations, while only a single one-electron wave was observed in RTILs composed of larger cations. It is proposed that complete reduction of the film cannot be achieved using larger RTIL cations, as steric hindrance within the film inhibits charge compensation.

AB - A glassy carbon microelectrode has been modified with multilayer films of 2-anthraquinonyl groups (AQL), and characterised in three different room temperature ionic liquids (RTILs). The electroactivity of the anthraquinonyl films was found to vary with the size of the RTIL cation, in that the extent of the AQL-/AQL2- reduction was found to decrease with increasing cation size. Two distinct one-electron redox waves were observed in RTILs composed of smaller cations, while only a single one-electron wave was observed in RTILs composed of larger cations. It is proposed that complete reduction of the film cannot be achieved using larger RTIL cations, as steric hindrance within the film inhibits charge compensation.

U2 - 10.1016/j.cplett.2011.06.073

DO - 10.1016/j.cplett.2011.06.073

M3 - Article

SN - 0009-2614

VL - 511

SP - 461

EP - 465

JO - CHEMICAL PHYSICS LETTERS

JF - CHEMICAL PHYSICS LETTERS

IS - 4-6

ER -