Toward Understanding the Dissociation of Weak Acids in Water: 1. Using IR Spectroscopy to Identify Proton-Shared Hydrogen-Bonded Ion-Pair Intermediates†

2009 ◽  
Vol 113 (13) ◽  
pp. 4152-4160 ◽  
Author(s):  
Vibin Thomas ◽  
Radu Iftimie
Keyword(s):  
Ir Spectroscopy ◽  
Ion Pair ◽  
Weak Acids ◽  
Hydrogen Bonded

Hydrogen-bonded complex-ion-pair equilibriums in 3,4-dinitrophenol-amine-aprotic solvent systems

1972 ◽  
Vol 76 (14) ◽  
pp. 1989-1993 ◽  
Author(s):  
R. A. Hudson ◽  
R. M. Scott ◽  
S. N. Vinogradov
Keyword(s):  
Aprotic Solvent ◽  
Ion Pair ◽  
Solvent Systems ◽  
Complex Ion ◽  
Hydrogen Bonded

Direct Observation of a Hydrogen-Bonded Charge-Transfer State of 4-Dimethylaminobenzonitrile in Methanol by Time-Resolved IR Spectroscopy

2003 ◽  
Vol 42 (16) ◽  
pp. 1826-1830 ◽  
Author(s):  
Wai-Ming Kwok ◽  
Michael W. George ◽  
David C. Grills ◽  
Chensheng Ma ◽  
Pavel Matousek ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Ir Spectroscopy ◽  
Direct Observation ◽  
Charge Transfer State ◽  
Time Resolved ◽  
Transfer State ◽  
Hydrogen Bonded

The Hydrogen-Bonded 2-Pyridone Dimer Model System. 1. Combined NMR and FT-IR Spectroscopy Study

2010 ◽  
Vol 114 (29) ◽  
pp. 7749-7760 ◽  
Author(s):  
Łukasz Szyc ◽  
Jing Guo ◽  
Ming Yang ◽  
Jens Dreyer ◽  
Peter M. Tolstoy ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Model System ◽  
Spectroscopy Study ◽  
Dimer Model ◽  
Ft Ir ◽  
System 1 ◽  
Ft Ir Spectroscopy ◽  
Hydrogen Bonded

Et3NH+Co(CO)4-: hydrogen-bonded adduct or simple ion pair? Single-crystal neutron diffraction study at 15 K

1992 ◽  
Vol 11 (7) ◽  
pp. 2339-2341 ◽  
Author(s):  
Lee Brammer ◽  
Melinda C. McCann ◽  
R. Morris Bullock ◽  
Richard K. McMullan ◽  
Paul Sherwood
Keyword(s):  
Neutron Diffraction ◽  
Single Crystal ◽  
Diffraction Study ◽  
Neutron Diffraction Study ◽  
Ion Pair ◽  
Hydrogen Bonded

Protein secondary structure from FT-IR spectroscopy: correlation with dihedral angles from three-dimensional Ramachandran plots

1991 ◽  
Vol 69 (11) ◽  
pp. 1639-1642 ◽  
Author(s):  
Michael Jackson ◽  
Henry H. Mantsch
Keyword(s):  
Ir Spectroscopy ◽  
Three Dimensional ◽  
Protein Secondary Structure ◽  
Secondary Structures ◽  
Dihedral Angles ◽  
Carbonyl Groups ◽  
Amide Carbonyl ◽  
Ft Ir ◽  
Ft Ir Spectroscopy ◽  
Hydrogen Bonded

The frequency of the so-called "amide I" band (amide C=O stretching vibration, vC=O) of proteins is discussed in terms of the dihedral angles of the various secondary structures present within proteins. We propose that in the case of intra- or intermolecular hydrogen-bonded amide carbonyl groups the frequency of this absorption can be directly related to the [Formula: see text], ψ angles of the amide moieties for the major secondary structures. Amide I bands at frequencies above those found for non-hydrogen bonded amide carbonyl groups are rationalized in terms of a change in the third dihedral angle, ω. Rotation around the amide C—N bond in sterically demanding structures, such as turns where ω deviates from 180°, is expected to cause an increase in the electron density of the amide carbonyl groups and so increase vC=O to frequencies greater than that seen for unperturbed carbonyl groups. Key words: FT-IR spectroscopy, proteins, structure, dihedral angles.

IR spectroscopy as a probe for C–H⋯X hydrogen bonded supramolecular synthons

CrystEngComm ◽  
2015 ◽  
Vol 17 (6) ◽  
pp. 1273-1290 ◽  
Author(s):  
Subhankar Saha ◽  
Lalit Rajput ◽  
Sumy Joseph ◽  
Manish Kumar Mishra ◽  
Somnath Ganguly ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Spectroscopic Method ◽  
Supramolecular Synthons ◽  
Ir Spectroscopic ◽  
Hydrogen Bonded

We describe a five step IR spectroscopic method that identifies supramolecular synthons in weak hydrogen bonded dimer assemblies, bifurcated systems, and π-electron mediated synthons.

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