Solvent effects on the charge transfer excited states of 4-dimethylaminobenzonitrile (DMABN) and 4-dimethylamino-3,5-dimethylbenzonitrile (TMABN) studied by time-resolved infrared spectroscopy: a direct observation of hydrogen bonding interactions

2007 ◽  
Vol 6 (9) ◽  
pp. 987 ◽  
Author(s):  
W. M. Kwok ◽  
C. Ma ◽  
M. W. George ◽  
D. C. Grills ◽  
P. Matousek ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Infrared Spectroscopy ◽  
Charge Transfer ◽  
Excited States ◽  
Direct Observation ◽  
Solvent Effects ◽  
Time Resolved ◽  
Hydrogen Bonding Interactions ◽  
Time Resolved Infrared Spectroscopy

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 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.

Direct Observation of Acyl Azide Excited States and Their Decay Processes by Ultrafast Time Resolved Infrared Spectroscopy

2009 ◽  
Vol 131 (12) ◽  
pp. 4212-4213 ◽  
Author(s):  
Jacek Kubicki ◽  
Yunlong Zhang ◽  
Jin Wang ◽  
Hoi Ling Luk ◽  
Huo-Lei Peng ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Excited States ◽  
Direct Observation ◽  
Time Resolved ◽  
Time Resolved Infrared Spectroscopy ◽  
Acyl Azide

Application of Time-Resolved Infrared Spectroscopy to Electronic Structure in Metal-to-Ligand Charge-Transfer Excited States

2002 ◽  
Vol 41 (23) ◽  
pp. 6071-6079 ◽  
Author(s):  
Dana M. Dattelbaum ◽  
Kristin M. Omberg ◽  
Jon R. Schoonover ◽  
Richard L. Martin ◽  
Thomas J. Meyer
Keyword(s):  
Electronic Structure ◽  
Infrared Spectroscopy ◽  
Charge Transfer ◽  
Excited States ◽  
Time Resolved ◽  
Ligand Charge Transfer ◽  
Time Resolved Infrared Spectroscopy

scholarly journals The Geometry of the Catalytic Active Site in [FeFe]-Hydrogenases is Determined by Hydrogen Bonding and Proton Transfer

2019 ◽  
Author(s):  
Jifu Duan ◽  
Stefan Mebs ◽  
Moritz Senger ◽  
Konstantin Laun ◽  
Florian Wittkamp ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Proton Transfer ◽  
Active Site ◽  
Time Resolved ◽  
X Ray Crystallography ◽  
Hydrogen Bonding Interactions ◽  
Catalytic Active Site ◽  
Catalytic Intermediates ◽  
Time Resolved Infrared Spectroscopy

The H2 conversion and CO inhibition reactivity of nine [FeFe]-hydrogenase constructs with semi-artificial cofactors was studied by in situ and time-resolved infrared spectroscopy, X-ray crystallography, and theoretical methods. Impaired hydrogen turnover and proton transfer as well as characteristic CO inhibition/ reactivation kinetics are assigned to varying degrees of hydrogen-bonding interactions at the active site. We show that the probability to adopt catalytic intermediates is modulated by intramolecular and protein-cofactor interactions that govern structural dynamics at the active site of [FeFe]-hydrogenases.<br>

scholarly journals The Geometry of the Catalytic Active Site in [FeFe]-Hydrogenases is Determined by Hydrogen Bonding and Proton Transfer

2019 ◽  
Author(s):  
Jifu Duan ◽  
Stefan Mebs ◽  
Moritz Senger ◽  
Konstantin Laun ◽  
Florian Wittkamp ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Proton Transfer ◽  
Active Site ◽  
Time Resolved ◽  
X Ray Crystallography ◽  
Hydrogen Bonding Interactions ◽  
Catalytic Active Site ◽  
Catalytic Intermediates ◽  
Time Resolved Infrared Spectroscopy

The H2 conversion and CO inhibition reactivity of nine [FeFe]-hydrogenase constructs with semi-artificial cofactors was studied by in situ and time-resolved infrared spectroscopy, X-ray crystallography, and theoretical methods. Impaired hydrogen turnover and proton transfer as well as characteristic CO inhibition/ reactivation kinetics are assigned to varying degrees of hydrogen-bonding interactions at the active site. We show that the probability to adopt catalytic intermediates is modulated by intramolecular and protein-cofactor interactions that govern structural dynamics at the active site of [FeFe]-hydrogenases.<br>

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