Probing by Time-Resolved FTIR Spectroscopy Mass Transport, Molecular Interactions, and Conformational Ordering in the System Chloroform−Syndiotactic Polystyrene

2002 ◽  
Vol 35 (6) ◽  
pp. 2296-2304 ◽  
Author(s):  
P. Musto ◽  
G. Mensitieri ◽  
S. Cotugno ◽  
G. Guerra ◽  
V. Venditto
Keyword(s):  
Mass Transport ◽  
Ftir Spectroscopy ◽  
Molecular Interactions ◽  
Syndiotactic Polystyrene ◽  
Time Resolved ◽  
Conformational Ordering

Conformational Ordering Process on Physical Gelation of Syndiotactic Polystyrene/Solvent Systems Revealed by Time-Resolved Infrared Spectroscopy

1993 ◽  
Vol 47 (9) ◽  
pp. 1417-1424 ◽  
Author(s):  
Masamichi Kobayashi ◽  
Takehito Kozasa
Keyword(s):  
Infrared Spectroscopy ◽  
Syndiotactic Polystyrene ◽  
Strong Interactions ◽  
Time Resolved ◽  
Conformational Order ◽  
Gelation Behavior ◽  
Solvent Systems ◽  
Conformational Ordering ◽  
Solvent Molecules ◽  
Time Resolved Infrared Spectroscopy

Syndiotactic polystyrene (SPS) dissolved in various organic solvents forms stable gels. Infrared spectroscopic research shows that SPS molecules assume highly ordered TTGG conformation in gels, giving rise to many infrared bands characteristic of the regular TTGG sequences. The behavior of the conformational ordering is strongly dependent on the solvent and the temperature. The time evolution of the conformational order on gelation has been investigated for SPS/CHCl3 systems at various polymer concentrations and temperatures by time-resolved infrared spectroscopy. By the analysis of the rate of formation of the ordered conformation derived from the time-resolved intensity measurement of the conformation-sensitive band at 572 cm−1, the number of the chain segments that contribute to the formation of clusters having ordered TTGG conformation has been evaluated as a function of temperature. The results indicate that at a temperature around 10°C the conformation ordering proceeds through clustering of five chain segments. The number decreases with lowering temperature and becomes unity below a certain temperature, suggesting that the ordering proceeds via self-organization within one chain. Such a crossover between the two mechanisms is found for other solvents, although the crossover temperature depends on the solvent. It has been concluded that strong interactions between polymer and solvent molecules play important roles in controlling the gelation behavior of SPS/solvent systems.

scholarly journals Structural Changes Due to the Deprotonation of the Proton Release Group in the M-Photointermediate of Bacteriorhodopsin as Revealed by Time-Resolved FTIR Spectroscopy†

Biochemistry ◽  
2008 ◽  
Vol 47 (44) ◽  
pp. 11598-11605 ◽  
Author(s):  
Joel E. Morgan ◽  
Ahmet S. Vakkasoglu ◽  
Johan Lugtenburg ◽  
Robert B. Gennis ◽  
Akio Maeda
Keyword(s):  
Ftir Spectroscopy ◽  
Structural Changes ◽  
Proton Release ◽  
Time Resolved ◽  
Release Group

Set-up for time-resolved step-scan FTIR spectroscopy of noncyclic reactions

1999 ◽  
Vol 19 (1) ◽  
pp. 143-149 ◽  
Author(s):  
Robin Rammelsberg ◽  
Sophie Boulas ◽  
Harald Chorongiewski ◽  
Klaus Gerwert
Keyword(s):  
Ftir Spectroscopy ◽  
Time Resolved ◽  
Set Up

Time-resolved FTIR study of light-driven sodium pump rhodopsins

2018 ◽  
Vol 20 (26) ◽  
pp. 17694-17704 ◽  
Author(s):  
Hui-Fen Chen ◽  
Keiichi Inoue ◽  
Hikaru Ono ◽  
Rei Abe-Yoshizumi ◽  
Akimori Wada ◽  
...  
Keyword(s):  
Ftir Spectroscopy ◽  
Sodium Pump ◽  
Functional Class ◽  
Sodium Ion ◽  
Ion Pump ◽  
Time Resolved ◽  
Ftir Study ◽  
Scan Time ◽  
Microbial Rhodopsin

Light-driven sodium ion pump rhodopsin (NaR) is a new functional class of microbial rhodopsin. Present step-scan time-resolved FTIR spectroscopy revealed that the K, L and O intermediates of NaRs contain 13-cis retinal with similar distortion.

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