ChemInform Abstract: Os2(CO)8: Transient Existence in Solution as Observed by Time-Resolved Infrared Spectroscopy Upon Flash Photolysis of Octacarbonyl-1,2-diosmacyclobutane.

ChemInform ◽  
1990 ◽  
Vol 21 (24) ◽  
Author(s):  
F.-W. GREVELS ◽  
W. E. KLOTZBUECHER ◽  
F. SEILS ◽  
K. SCHAFFNER ◽  
J. TAKATS
Keyword(s):  
Infrared Spectroscopy ◽  
Flash Photolysis ◽  
Time Resolved ◽  
Time Resolved Infrared Spectroscopy

Kinetic and Spectroscopic Studies on Acyl Radicals in Solution by Time-Resolved Infrared Spectroscopy

1995 ◽  
Vol 48 (2) ◽  
pp. 363 ◽  
Author(s):  
CE Brown ◽  
AG Neville ◽  
DM Rayner ◽  
KU Ingold ◽  
J Lusztyk
Keyword(s):  
Infrared Spectroscopy ◽  
Rate Constant ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Spectroscopic Studies ◽  
Kinetic Properties ◽  
Acyl Radical ◽  
Time Resolved ◽  
Acyl Radicals ◽  
Time Resolved Infrared Spectroscopy

A number of acyl radicals, RĊ=O, have been generated in hexane or di -t-butyl peroxide as solvent at room temperature by 308 nm laser flash photolysis, and their spectroscopic and kinetic properties have been examined by time-resolved infrared spectroscopy. The C=O stretching frequencies for the RĊ=O radicals are found to be higher than those of the corresponding aldehydes, RCHO, by between 108 and 128 cm-1, an effect attributed to a higher C=O bond order in the radicals. For the RĊ=O radicals some typical values of vC =O are: CH3Ċ=O, 1864 cm-1; (CH3)3CĊ=O, 1848 cm-1; and C6H5Ċ=O, 1828 cm-1, while the corresponding acylperoxyl radicals, RC(O)OO, formed by reaction with oxygen have vC =O values of 1838, 1840 and 1820 cm-1, respectively. The acyl radicals exhibit a reactivity towards a variety of substrates that is roughly comparable to that of simple alkyl radicals. For reactions of the benzoyl radical some typical rate constants/M-1 s-1 are: CCl4, 6.0x104; C6H5SH, 4.8×107; CCl3Br, 2.2×108; Tempo, 1.1×109; and oxygen, 1.8×109. Alkanoyl radicals have a rather similar reactivity to benzoyl. The propanoyl radical reacts with tributyltin deuteride with a rate constant of 3×105 M-1s-1. The hex-5-enoyl radical undergoes a 5-exo-trig cyclization to form the 2-oxocyclopentylmethyl radical with a rate constant of 2.2×105 s-1, a value which is almost identical to that for cyclization of the hex-5-enyl radical. It is hoped that our kinetic data will prove useful in the planning of organic synthetic strategies which involve acyl radical chemistry.

Photochemistry of aryl azides: detection and characterization of a dehydroazepine by time-resolved infrared spectroscopy and flash photolysis at room temperature

1987 ◽  
Vol 109 (15) ◽  
pp. 4723-4726 ◽  
Author(s):  
Charles J. Shields ◽  
Douglas R. Chrisope ◽  
Gary B. Schuster ◽  
Andrew J. Dixon ◽  
Martyn Poliakoff ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Room Temperature ◽  
Flash Photolysis ◽  
Aryl Azides ◽  
Time Resolved ◽  
Time Resolved Infrared Spectroscopy

A quantum cascade laser setup for studying irreversible photoreactions in H2O with nanosecond resolution and microlitre consumption

2020 ◽  
Vol 22 (45) ◽  
pp. 26459-26467
Author(s):  
Jessica L. Klocke ◽  
Tilman Kottke
Keyword(s):  
Infrared Spectroscopy ◽  
Quantum Cascade Laser ◽  
Time Resolved ◽  
Quantum Cascade ◽  
Time Resolved Infrared Spectroscopy ◽  
Laser Setup

Flavin photoreduction in H2O is elucidated by developing a quantum cascade laser setup for time-resolved infrared spectroscopy on irreversible reactions.

Water Transport in Proton Exchange Membranes: Insights from Time-Resolved Infrared Spectroscopy

2019 ◽  
Vol 33 (1) ◽  
pp. 1029-1033 ◽  
Author(s):  
Daniel Hallinan ◽  
Maria Grazia De Angelis ◽  
Marco Giacinti Baschetti ◽  
Giulio Sarti ◽  
Yossef A. Elabd
Keyword(s):  
Infrared Spectroscopy ◽  
Water Transport ◽  
Proton Exchange Membranes ◽  
Proton Exchange ◽  
Time Resolved ◽  
Time Resolved Infrared Spectroscopy

scholarly journals Probing the Contributions to DNA Hybridization Dynamics with Time-Resolved Infrared Spectroscopy

2021 ◽  
Vol 120 (3) ◽  
pp. 8a-9a
Author(s):  
Brennan Ashwood ◽  
Paul J. Sanstead ◽  
Qing Dai ◽  
Chuan He ◽  
Andrei Tokmakoff
Keyword(s):  
Infrared Spectroscopy ◽  
Dna Hybridization ◽  
Time Resolved ◽  
Time Resolved Infrared Spectroscopy
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