Blue to green shifted fluorescence in inter- and intramolecular hydrogen bonded di(benzimidazol-2-yl)benzene

2009 ◽  
pp. 4426 ◽  
Author(s):  
Bijayalaxmi Jena ◽  
S. Sundar Manoharan
Keyword(s):  
Intramolecular Hydrogen ◽  
Hydrogen Bonded

Photoelectron studies on intramolecularly hydrogen-bonded systems. I. The photoelectron spectra of cis- and trans-2-aminocyclopentanol, and cis- and trans-2-(N,N-dimethylamino)cyclopentanol

1976 ◽  
Vol 54 (4) ◽  
pp. 642-646 ◽  
Author(s):  
R. S. Brown
Keyword(s):  
Hydrogen Bonding ◽  
Ionization Energy ◽  
Lone Pair ◽  
Intramolecular Hydrogen Bonding ◽  
Photoelectron Spectra ◽  
Hydrogen Bonded Systems ◽  
Intramolecular Hydrogen ◽  
Cis And Trans ◽  
Infrared Data ◽  
Hydrogen Bonded

The photoelectron spectra of cis- and trans-2-aminocyclopentanol and cis- and trans-2-(N,N,-dimethylamino)cyclopentanol have been recorded and interpreted. The cis isomers exhibit N lone pair ionizations at higher ionization energy, and O lone pair ionizations at lower ionization energy than their trans isomers.The results are most consistent with the existence and observation of intramolecular hydrogen-bonding in the cis isomers. Infrared data on these systems also show that the cis isomers exist in the intramolecularly hydrogen-bonded state.

scholarly journals Evaluation of Common Theoretical Methods for Predicting Infrared Multiphotonic Dissociation Vibrational Spectra of Intramolecular Hydrogen-Bonded Ions

ACS Omega ◽  
2018 ◽  
Vol 3 (8) ◽  
pp. 9075-9085 ◽  
Author(s):  
André F. Rodrigues-Oliveira ◽  
Francisco W. M. Ribeiro ◽  
Gustavo Cervi ◽  
Thiago C. Correra
Keyword(s):  
Vibrational Spectra ◽  
Theoretical Methods ◽  
Intramolecular Hydrogen ◽  
Hydrogen Bonded

Vibrational Circular Dichroism of Proline-Containing Oligopeptides

1996 ◽  
Vol 50 (5) ◽  
pp. 644-648 ◽  
Author(s):  
Mitsuhiro Miyazawa ◽  
Katsuhiko Inouye ◽  
Tadao Hayakawa ◽  
Yoshimasa Kyogoku ◽  
Hiromu Sugeta
Keyword(s):  
Hydrogen Bond ◽  
Circular Dichroism ◽  
Vibrational Circular Dichroism ◽  
Type Ii ◽  
Dilute Solutions ◽  
Infrared Absorption Spectra ◽  
High Concentrations ◽  
Intramolecular Hydrogen ◽  
Circular Dichroïsm ◽  
Hydrogen Bonded

Vibrational circular dichroism (VCD) and infrared absorption spectra in the amide A region of blocked oligopeptides containing proline have been obtained in apolar organic solvents in order to clarify the characteristic VCD for the intramolecularly hydrogen-bonded NH stretching involved in the turn structures of peptide chains as well as the intermolecularly hydrogen-bonded NH stretching in associated molecules. The γ-turn with the intramolecularly hydrogen-bonded C7 conformation exhibits a characteristic positive VCD band at about 3330 cm−1 in dilute solutions of Piv-Pro-NHMe and Ac-Pro-NHMe. The intramolecularly hydrogen-bonded NH stretching in the type II β-turn with C10 conformation gives rise to a positive VCD band at 3345 cm−1 for Piv-Pro-Gly-NHMe. The Gly NH group of Piv-Pro-Gly-OMe and Ac-Pro-Gly-OMe in dilute solutions assumes C7C5 conformation stabilized by a bifurcated three-center intramolecular hydrogen bond and exhibits a positive VCD band near 3300 cm−1 at a lower frequency than the intermolecularly hydrogen-bonded band. All the peptides studied give a characteristic negative—positive bisignate couplet from the high wavenumber side for the intermolecularly hydrogen-bonded NH stretching band at high concentrations.

An Investigation of13C-NMR Spectra of Some Intramolecular Hydrogen Bonded and Non-Bonded Azo Dyes

1996 ◽  
Vol 29 (1) ◽  
pp. 185-192 ◽  
Author(s):  
Hasan Kocaokutgen ◽  
Ismail E. Gümrükçüoğlu
Keyword(s):  
Azo Dyes ◽  
Nmr Spectra ◽  
Intramolecular Hydrogen ◽  
Hydrogen Bonded
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