TY - JOUR
T1 - Luminescence quenching of Re(i) molecular rectangles by quinones
AU - Rajendran, Thangamuthu
AU - Manimaran, Balasubramanian
AU - Liao, Rong Tang
AU - Liu, Yen Hsiang
AU - Thanasekaran, Pounraj
AU - Lin, Ren Jay
AU - Chang, I. Jy
AU - Chou, Pi Tai
AU - Ramaraj, Ramasamy
AU - Rajagopal, Seenivasan
AU - Lu, Kuang Lieh
PY - 2010
Y1 - 2010
N2 - The rhenium-based rectangles [{Re(CO)3(μ-bpy)Br}{Re(CO) 3(μ-L)Br}]2 (I, L = 4,4′-dipyridylacetylene (dpa); II, L = 4,4′-dipyridylbutadiyne (dpb); III, L = 1,4-bis(4′-pyridylethynyl)benzene (bpeb); bpy = 4,4′-bipyridine) are emissive in solution at room temperature. The presence of extended π conjugation leads to an increase in electron delocalization, which, in turn, results in improved luminescence and lower nuclear reorganization energy. These rectangles, upon electronic excitation, undergo facile electron transfer (ET) reactions with quinones and both the dynamic and static quenching contribute to the reaction. Spectral and electrochemical measurements show that quinone 7,7,8,8-tetracyanoquinodimethane (TCNQ) binds strongly to rectangle I. The driving force dependence of ket, deduced from the luminescence quenching of rectangles with quinones, can be well accounted for within the context of the Marcus theory of electron transfer.
AB - The rhenium-based rectangles [{Re(CO)3(μ-bpy)Br}{Re(CO) 3(μ-L)Br}]2 (I, L = 4,4′-dipyridylacetylene (dpa); II, L = 4,4′-dipyridylbutadiyne (dpb); III, L = 1,4-bis(4′-pyridylethynyl)benzene (bpeb); bpy = 4,4′-bipyridine) are emissive in solution at room temperature. The presence of extended π conjugation leads to an increase in electron delocalization, which, in turn, results in improved luminescence and lower nuclear reorganization energy. These rectangles, upon electronic excitation, undergo facile electron transfer (ET) reactions with quinones and both the dynamic and static quenching contribute to the reaction. Spectral and electrochemical measurements show that quinone 7,7,8,8-tetracyanoquinodimethane (TCNQ) binds strongly to rectangle I. The driving force dependence of ket, deduced from the luminescence quenching of rectangles with quinones, can be well accounted for within the context of the Marcus theory of electron transfer.
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U2 - 10.1039/b925978c
DO - 10.1039/b925978c
M3 - Article
AN - SCOPUS:77749291941
SN - 1477-9226
VL - 39
SP - 2928
EP - 2935
JO - Dalton Transactions
JF - Dalton Transactions
IS - 11
ER -