TY - JOUR
T1 - Electro- and magneto-electrochemistry of zeolite Y- and MCM-41-associated bipyrylium ion
AU - Doménech, Antonio
AU - García, Hermenegildo
AU - Carbonell Llopis, Esther
PY - 2005/4/1
Y1 - 2005/4/1
N2 - The electrochemical response of bipyrylium bication [1,4-bis(3,5-diphenyl- 4-pyrylium)phenylene] associated with Y and MCM-41 aluminosilicates (BTP@Y and BTP@MCM, respectively) is described using polymer-film electrodes immersed into Et4N+ + MeCN and Bu4N+ + MeCN electrolytes. BTP@MCM provides a solution-like response in all electrolytes consisting in two successive strongly comproportionation mediated one-electron reduction processes near to +0.05 and -0.12 V vs. Ag|AgCl. The response of BTP@Y in Bu4N+ + MeCN is restricted to a unique reduction process near to -0.40 V, while in Et4N+ + MeCN, it differs significantly: here, two reduction processes at -0.22 and -0.36 V appear. This response suggests the presence of different boundary-associated topological redox isomers for which no significant comproportionation reaction occurs. Under the application of a static magnetic field, the electrochemical response of BTP@MCM remains almost unchanged while that of BTP@Y in contact with Et 4N+ + MeCN is sensitive to changes in the orientation and strength of the external magnetic field. Such magnetoelectrochemical effects are consistent with the idea that different boundary-associated orientation isomers of BTP@Y exist.
AB - The electrochemical response of bipyrylium bication [1,4-bis(3,5-diphenyl- 4-pyrylium)phenylene] associated with Y and MCM-41 aluminosilicates (BTP@Y and BTP@MCM, respectively) is described using polymer-film electrodes immersed into Et4N+ + MeCN and Bu4N+ + MeCN electrolytes. BTP@MCM provides a solution-like response in all electrolytes consisting in two successive strongly comproportionation mediated one-electron reduction processes near to +0.05 and -0.12 V vs. Ag|AgCl. The response of BTP@Y in Bu4N+ + MeCN is restricted to a unique reduction process near to -0.40 V, while in Et4N+ + MeCN, it differs significantly: here, two reduction processes at -0.22 and -0.36 V appear. This response suggests the presence of different boundary-associated topological redox isomers for which no significant comproportionation reaction occurs. Under the application of a static magnetic field, the electrochemical response of BTP@MCM remains almost unchanged while that of BTP@Y in contact with Et 4N+ + MeCN is sensitive to changes in the orientation and strength of the external magnetic field. Such magnetoelectrochemical effects are consistent with the idea that different boundary-associated orientation isomers of BTP@Y exist.
KW - Bipyrylium ion
KW - Magnetoelectrochemistry
KW - Redox isomers
KW - Y and MCM-41 aluminosilicates
UR - http://www.scopus.com/inward/record.url?scp=14744300307&partnerID=8YFLogxK
U2 - 10.1016/j.jelechem.2004.11.036
DO - 10.1016/j.jelechem.2004.11.036
M3 - Article
AN - SCOPUS:14744300307
SN - 0022-0728
VL - 577
SP - 249
EP - 262
JO - Journal of Electroanalytical Chemistry
JF - Journal of Electroanalytical Chemistry
IS - 2
ER -