Vibrational dynamics of the CO stretching of 9-fluorenone studied by visible-pump and infrared-probe spectroscopy

2015 ◽  
Vol 177 ◽  
pp. 65-75 ◽  
Author(s):  
Yuki Fukui ◽  
Kaoru Ohta ◽  
Keisuke Tominaga
Keyword(s):  
Low Frequency ◽  
Spectral Shift ◽  
Vibrational Dynamics ◽  
Electronically Excited State ◽  
Protic Solvents ◽  
Electronically Excited ◽  
Probe Spectroscopy ◽  
Hydrogen Bond Dynamics ◽  
Solvent Complex ◽  
Anharmonic Couplings

We studied the effects of hydrogen bonds on the vibrational structures and vibrational dynamics of the CO stretching mode of 9-fluorenone (FL) in the electronically excited state in aprotic and protic solvents using sub-picosecond visible-pump and IR-probe spectroscopy. The transient IR spectrum of the CO stretching band in methanol-d4 has two bands at 1529.9 cm−1 and 1543.4 cm−1, which are assigned to an FL-solvent complex and free FL, respectively. In the aprotic solvents, the CO stretching bands show blue-shifts in time. This shift is due to vibrational cooling, which is derived from anharmonic couplings with some low-frequency modes. Interestingly, a red-shift is observed at later delay time for the band at 1529.9 cm−1 in methanol-d4. A possible mechanism of this spectral shift is related to the hydrogen bond dynamics between the solute and solvent.

scholarly journals Ultrafast Vibrational Dynamics of CO Ligands on RuTPP/Cu(110) under Photodesorption Conditions

Surfaces ◽  
2019 ◽  
Vol 2 (1) ◽  
pp. 117-130 ◽  
Author(s):  
Takuma Omiya ◽  
Yousoo Kim ◽  
Rasmita Raval ◽  
Heike Arnolds
Keyword(s):  
Low Frequency ◽  
Blue Shift ◽  
Vibrational Modes ◽  
Vibrational Dynamics ◽  
Sum Frequency ◽  
Stretching Vibration ◽  
A Charge ◽  
Anharmonic Coupling ◽  
Vibration Coupling ◽  
Probe Spectroscopy

We have studied CO coordinated to ruthenium tetraphenylporphyrin (RuTPP)/Cu(110) and directly adsorbed to Cu(110), using femtosecond pump-sum frequency probe spectroscopy, to alter the degree of electron-vibration coupling between the metal substrate and CO. We observe the facile femtosecond laser-induced desorption of CO from RuTPP/Cu(110), but not from Cu(110). A change in the vibrational transients, in the first few picoseconds, from a red- to blue-shift of the C–O stretching vibration under photodesorption conditions, was also observed. This drastic change can be explained, if the cause of the C–O frequency redshift of Cu(110) is not the usually-assumed anharmonic coupling to low frequency vibrational modes, but a charge transfer from hot electrons to the CO 2π* state. This antibonding state shifts to higher energies on RuTPP, removing the C–O redshift and, instead, reveals a blueshift, predicted to arise from electron-mediated coupling between the coherently excited internal stretch and low frequency modes in the system.

Low-frequency vibrational spectroscopy: a new tool for revealing crystalline magnetic structures in iron phosphate crystals

2021 ◽  
Vol 23 (39) ◽  
pp. 22241-22245
Author(s):  
Zihui Song ◽  
Xudong Liu ◽  
Anish Ochani ◽  
Suling Shen ◽  
Qiqi Li ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Long Range ◽  
Vibrational Spectroscopy ◽  
Strong Dependence ◽  
Low Frequency ◽  
Lithium Ion ◽  
Iron Phosphate ◽  
Promising Material ◽  
Vibrational Dynamics ◽  
Magnetic Structures

In this report, the strong-dependence of low-frequency (terahertz) vibrational dynamics on weak and long-range forces in crystals is leveraged to determine the bulk magnetic configuration of iron phosphate – a promising material for cathodes in lithium ion batteries.

Time-Resolved X-ray Scattering of an Electronically Excited State in Solution. Structure of the3A2uState of Tetrakis-μ-pyrophosphitodiplatinate(II)

2009 ◽  
Vol 131 (2) ◽  
pp. 502-508 ◽  
Author(s):  
Morten Christensen ◽  
Kristoffer Haldrup ◽  
Klaus Bechgaard ◽  
Robert Feidenhans’l ◽  
Qingyu Kong ◽  
...  
Keyword(s):  
Excited State ◽  
Solution Structure ◽  
Time Resolved ◽  
X Ray ◽  
Electronically Excited State ◽  
X Ray Scattering ◽  
Electronically Excited ◽  
Ray Scattering
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