TY - JOUR
T1 - Nature of Excited States of Ruthenium-Based Solar Cell Dyes in Solution
T2 - A Comprehensive Spectroscopic Study
AU - Horvath, Raphael
AU - Fraser, Michael G.
AU - Clark, Charlotte A.
AU - Sun, Xue Zhong
AU - George, Michael W.
AU - Gordon, Keith C.
N1 - Publisher Copyright:
© 2015 American Chemical Society.
PY - 2015/12/21
Y1 - 2015/12/21
N2 - The photophysical properties of a number of ruthenium complexes of the general structure [Ru(L1)(L2)(NCS)2], related to the prominent solar cell dye [Ru(dcb)2(NCS)2] (dcb = 4,4′-dicarboxylato-2,2′-bipyridine) are investigated. For L1 = dcb and dmb (dmb = 4,4′-dimethyl-2,2′-bipyridine), several variations of L2 show very little difference in the lowest energy absorption peak. Resonance Raman and density functional theory calculations have been used to assign the corresponding transitions as {Ru(NCS)2} → dcb with significant contributions of the NCS ligands. Transient absorption, time-resolved infrared, and transient resonance Raman spectroscopic techniques were used to probe the photophysics of the complexes and relatively short-lived {Ru(NCS)2} → dcb/dpb (dpb = 4,4′-diphenylethenyl-2,2′-bipyridine) excited states were observed with the exception of [Ru(dcb)(dab)(NCS)2] (dab = 4,4′-dianthracenethenyl-2,2′-bipyridine), which showed a long-lived excited state assigned as ligand centered charge separated.
AB - The photophysical properties of a number of ruthenium complexes of the general structure [Ru(L1)(L2)(NCS)2], related to the prominent solar cell dye [Ru(dcb)2(NCS)2] (dcb = 4,4′-dicarboxylato-2,2′-bipyridine) are investigated. For L1 = dcb and dmb (dmb = 4,4′-dimethyl-2,2′-bipyridine), several variations of L2 show very little difference in the lowest energy absorption peak. Resonance Raman and density functional theory calculations have been used to assign the corresponding transitions as {Ru(NCS)2} → dcb with significant contributions of the NCS ligands. Transient absorption, time-resolved infrared, and transient resonance Raman spectroscopic techniques were used to probe the photophysics of the complexes and relatively short-lived {Ru(NCS)2} → dcb/dpb (dpb = 4,4′-diphenylethenyl-2,2′-bipyridine) excited states were observed with the exception of [Ru(dcb)(dab)(NCS)2] (dab = 4,4′-dianthracenethenyl-2,2′-bipyridine), which showed a long-lived excited state assigned as ligand centered charge separated.
UR - http://www.scopus.com/inward/record.url?scp=84951733335&partnerID=8YFLogxK
U2 - 10.1021/acs.inorgchem.5b01690
DO - 10.1021/acs.inorgchem.5b01690
M3 - Article
AN - SCOPUS:84951733335
SN - 0020-1669
VL - 54
SP - 11697
EP - 11708
JO - Inorganic Chemistry
JF - Inorganic Chemistry
IS - 24
ER -
