TY - JOUR
T1 - Metal-Metal Bond Formations in [Au(CN) 2 - ] n (n = 3-5) Oligomers in Water Identified by Coherent Nuclear Wavepacket Motions
AU - Iwamura, Munetaka
AU - Kimoto, Kenshi
AU - Nozaki, Koichi
AU - Kuramochi, Hikaru
AU - Takeuchi, Satoshi
AU - Tahara, Tahei
N1 - Publisher Copyright:
© 2018 American Chemical Society.
PY - 2018/12/20
Y1 - 2018/12/20
N2 - Large oligomers of [Au(CN) 2 - ] n including the pentamer were favorably formed in an aqueous solution containing tetra-ethylammonium chloride (1.0 mol/dm 3 ), and intense transient absorption in the visible region was recorded by selective photoexcitation of the oligomers. Distinct oscillations at ∼40-100 cm -1 were clearly observed in the temporal profile of the excited-state absorption signal, and the frequency-wavelength two-dimensional analysis of the oscillation clearly distinguishes the coherent nuclear motion of different oligomers. The observed nuclear motions were assigned to Au-Au stretch vibrations in the trimer, tetramer, and pentamer induced by the bond formation in the excited states. The transient absorption exhibits significant changes with a time constant of 3-20 ps, reflecting intersystem crossing and structural change.
AB - Large oligomers of [Au(CN) 2 - ] n including the pentamer were favorably formed in an aqueous solution containing tetra-ethylammonium chloride (1.0 mol/dm 3 ), and intense transient absorption in the visible region was recorded by selective photoexcitation of the oligomers. Distinct oscillations at ∼40-100 cm -1 were clearly observed in the temporal profile of the excited-state absorption signal, and the frequency-wavelength two-dimensional analysis of the oscillation clearly distinguishes the coherent nuclear motion of different oligomers. The observed nuclear motions were assigned to Au-Au stretch vibrations in the trimer, tetramer, and pentamer induced by the bond formation in the excited states. The transient absorption exhibits significant changes with a time constant of 3-20 ps, reflecting intersystem crossing and structural change.
UR - http://www.scopus.com/inward/record.url?scp=85058708812&partnerID=8YFLogxK
U2 - 10.1021/acs.jpclett.8b03139
DO - 10.1021/acs.jpclett.8b03139
M3 - 学術論文
C2 - 30422661
AN - SCOPUS:85058708812
SN - 1948-7185
VL - 9
SP - 7085
EP - 7089
JO - Journal of Physical Chemistry Letters
JF - Journal of Physical Chemistry Letters
IS - 24
ER -