| Real-time Observation of Tight Au-Au Bond Formation and Relevant Coherent Motion upon Photoexcitation of [Au(CN)(2)(-)] Oligomers. | |
| | |
MedLine Citation:
|
PMID: 23273414 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
|
Structural dynamics involving tight Au-Au bond formation of excited-state oligomers [Au(CN)(2)(-)](n) was studied using picosecond/femtosecond time-resolved emission and absorption spectroscopy. With selective excitation of the trimer ([Au(CN)(2)(-)](3)) in aqueous solutions, transient absorption due to the excited-state trimer was observed around 600 nm. This transient exhibited a significant intensity increase (τ = 2.1 ps) with a blue shift in the early picosecond time region. DFT/TDDFT calculations revealed that the observed spectral changes are ascribed to the structural change from the bent structures to linear staggered one in the triplet excited-state trimer. The transient absorption also exhibited a clear modulation of the peak position, reflecting coherent nuclear wavepacket motion induced by photoexcitation. The frequencies of the coherent motions are 66 and 87 cm(-1), which accorded very well with the frequencies of two Au-Au stretch vibrations in the excited state of the trimer calculated by DFT. Time-resolved emission spectra in the sub-nanosecond time region showed that association of the excited-state trimer with the ground-state monomer proceeds with τ = 2.0 ns, yielding the excited-state tetramer. |
| | |
Authors:
|
Munetaka Iwamura; Koichi Nozaki; Satoshi Takeuchi; Tahei Tahara |
Related Documents
:
|
23511414 - The chemistry of two-dimensional layered transition metal dichalcogenide nanosheets. 23320684 - State-to-state quantum dynamics of the o((3)p) + nh(x(3)Σ(-)) reaction on the three lo... 23634954 - Vibration-assisted upconversion of molecular luminescence induced by scanning tunneling... 22920964 - Interplay between vibrational energy transfer and excited state deactivation in dna com... 1686084 - Ancestral transfer of symbionts between cockroaches and termites: an alternative hypoth... 19518704 - Discovery of a new broad resonance in 19ne: implications for the destruction of the cos... |
Publication Detail:
|
Type: JOURNAL ARTICLE Date: 2012-12-31 |
Journal Detail:
|
Title: Journal of the American Chemical Society Volume: - ISSN: 1520-5126 ISO Abbreviation: J. Am. Chem. Soc. Publication Date: 2012 Dec |
Date Detail:
|
Created Date: 2012-12-31 Completed Date: - Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 7503056 Medline TA: J Am Chem Soc Country: - |
Other Details:
|
Languages: ENG Pagination: - Citation Subset: - |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
|
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Synthesis and antioxidant activity of thymol and carvacrol based Schiff bases.
Next Document: Typing of Pseudomonas aeruginosa from hemorrhagic pneumonia in mink (Neovison vison).