Monitoring the effect of ultrafast deactivation of the electronic excited states of DNA bases and polynucleotides following 267 nm laser excitation using picosecond time-resolved infrared spectroscopy

2005 ◽  
pp. 1182 ◽  
Author(s):  
Marina K. Kuimova ◽  
Joanne Dyer ◽  
Michael W. George ◽  
David C. Grills ◽  
John M. Kelly ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Excited States ◽  
Laser Excitation ◽  
Dna Bases ◽  
Time Resolved ◽  
Electronic Excited States ◽  
Time Resolved Infrared Spectroscopy

scholarly journals Time-Resolved, Step-Scan Ftir Studies Of Excited States Of d6 Metal Polypyridine Complexes

1999 ◽  
Vol 19 (1-4) ◽  
pp. 263-269 ◽  
Author(s):  
Jon R. Schoonover
Keyword(s):  
Infrared Spectroscopy ◽  
Excited States ◽  
Laser Excitation ◽  
Time Resolved ◽  
Ftir Studies ◽  
Inorganic Species ◽  
Polypyridine Complexes ◽  
Time Resolved Infrared Spectroscopy

Time-resolved infrared spectroscopy using step-scan FTIR has been developed as an approach to study transient inorganic species with lifetimes ranging from ca. 200 nanseconds to several microseconds. This approach has been applied to a variety of problems arising following laser excitation of d6 polypyridine complexes in solution, and several examples are shown to demonstrate the utility of this experiment.

scholarly journals Direct observation by time-resolved infrared spectroscopy of the bright and the dark excited states of the [Ru(phen)2(dppz)]2+ light-switch compound in solution and when bound to DNA

2016 ◽  
Vol 7 (5) ◽  
pp. 3075-3084 ◽  
Author(s):  
Fergus E. Poynton ◽  
James P. Hall ◽  
Páraic M. Keane ◽  
Christine Schwarz ◽  
Igor V. Sazanovich ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Excited States ◽  
Direct Observation ◽  
Time Resolved ◽  
Time Resolved Infrared Spectroscopy

Strikingly different TRIR spectra are recorded for the complex in D2O or CD3CN or when DNA-bound.

scholarly journals Ruthenium Assemblies for CO2 Reduction and H2 Generation: Time Resolved Infrared Spectroscopy, Spectroelectrochemistry and a Photocatalysis Study in Solution and on NiO

2021 ◽  
Vol 9 ◽  
Author(s):  
Florian J. R. Cerpentier ◽  
Joshua Karlsson ◽  
Ralte Lalrempuia ◽  
Michael P. Brandon ◽  
Igor V. Sazanovich ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Excited States ◽  
Co2 Reduction ◽  
Carbonyl Groups ◽  
Intermediate Species ◽  
Time Resolved ◽  
H2 Generation ◽  
Catalytic Metal ◽  
The One ◽  
Time Resolved Infrared Spectroscopy

Two novel supramolecular complexes RuRe ([Ru(dceb)2(bpt)Re(CO)3Cl](PF6)) and RuPt ([Ru(dceb)2(bpt)PtI(H2O)](PF6)2) [dceb = diethyl(2,2′-bipyridine)-4,4′-dicarboxylate, bpt = 3,5-di(pyridine-2-yl)-1,2,4-triazolate] were synthesized as new catalysts for photocatalytic CO2 reduction and H2 evolution, respectively. The influence of the catalytic metal for successful catalysis in solution and on a NiO semiconductor was examined. IR-active handles in the form of carbonyl groups on the peripheral ligand on the photosensitiser were used to study the excited states populated, as well as the one-electron reduced intermediate species using infrared and UV-Vis spectroelectrochemistry, and time resolved infrared spectroscopy. Inclusion of ethyl-ester moieties led to a reduction in the LUMO energies on the peripheral bipyridine ligand, resulting in localization of the 3MLCT excited state on these peripheral ligands following excitation. RuPt generated hydrogen in solution and when immobilized on NiO in a photoelectrochemical (PEC) cell. RuRe was inactive as a CO2 reduction catalyst in solution, and produced only trace amounts of CO when the photocatalyst was immobilized on NiO in a PEC cell saturated with CO2.

scholarly journals Excited States and Intermediates by Time-Resolved Infrared Spectroscopy

1999 ◽  
Vol 19 (1-4) ◽  
pp. 245-251 ◽  
Author(s):  
J. J. Turner ◽  
M. W. George ◽  
I. P. Clark ◽  
I. G. Virrels
Keyword(s):  
Infrared Spectroscopy ◽  
Excited State ◽  
Charge Transfer ◽  
Excited States ◽  
Fast Time ◽  
Time Resolved ◽  
Excited Species ◽  
Charge Transfer Transitions ◽  
Time Resolved Infrared Spectroscopy ◽  
Kinetics Of

For coordination compounds containing CO or CN groups, fast time-resolved infrared spectroscopy (TRIR) provides a convenient method of probing excited states and intermediates. TRIR has proved particularly powerful for probing the structure and kinetics of organometallic intermediates. The interpretation is particularly straightforward when combined with IR data from matrix isolation experiments, although there can be some subtle differences. In excited state studies, shifts in ν(CO) and ν(CN) frequencies, from ground to excited state, are sensitive to the changes in electron distribution on excitation, thus allowing the distinction between charge-transfer and non-charge-transfer transitions. Subtle effects on excited state ν(CO) band positions occur with change from fluid to rigid solvent-“infrared rigidochromism”. There is often a change in ν(CO) band width on excitation; this can be interpreted in terms of specific interactions between the excited species and the solvent. This paper presents some of our recent work in this area.

scholarly journals Picosecond time-resolved infrared spectroscopy of rhodium and iridium azides

2014 ◽  
Vol 43 (47) ◽  
pp. 17694-17702 ◽  
Author(s):  
Peter Portius ◽  
Anthony J. H. M. Meijer ◽  
Michael Towrie ◽  
Benjamin F. Crozier ◽  
Ingrid Schiager
Keyword(s):  
Density Functional Theory ◽  
Infrared Spectroscopy ◽  
Transition Metal ◽  
Density Functional ◽  
Laser Excitation ◽  
Functional Theory ◽  
Time Resolved ◽  
Photochemical Processes ◽  
Time Resolved Infrared Spectroscopy

Ultrafast photochemical processes induced in the transition metal azido complexes Rh(Cp*)(N3)2(PPh3) and Ir(Cp*)(N3)2(PPh3) upon laser excitation at 266 nm and 400 nm were elucidated by picosecond time-resolved infrared spectroscopy and density functional theory.

Probing the Excited States of d6Metal Complexes Containing the 2,2‘-Bipyrimidine Ligand Using Time-Resolved Infrared Spectroscopy. 1. Mononuclear and Homodinuclear Systems

2007 ◽  
Vol 46 (9) ◽  
pp. 3696-3704 ◽  
Author(s):  
Wassim Z. Alsindi ◽  
Timothy L. Easun ◽  
X.-Z. Sun ◽  
Kate L. Ronayne ◽  
Michael Towrie ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Excited States ◽  
Time Resolved ◽  
Time Resolved Infrared Spectroscopy
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