Intramolecular hydrogen bonds and molecular dipole moments

1971 ◽  
Vol 4 (6) ◽  
pp. 532-534 ◽  
Author(s):  
A. E. Lutskii ◽  
N. I. Gorokhova
Keyword(s):  
Hydrogen Bonds ◽  
Dipole Moments ◽  
Intramolecular Hydrogen Bonds ◽  
Molecular Dipole ◽  
Intramolecular Hydrogen

The conformation of substituted hydroxyureas and hydroxythioureas in solution

1979 ◽  
Vol 44 (3) ◽  
pp. 895-907 ◽  
Author(s):  
Jiří Mollin ◽  
Pavel Fiedler ◽  
Václav Jehlička ◽  
Otto Exner
Keyword(s):  
Infrared Spectroscopy ◽  
Hydrogen Bonds ◽  
Dipole Moments ◽  
Intramolecular Hydrogen Bonds ◽  
Nonpolar Solvents ◽  
Steric Factors ◽  
Intramolecular Hydrogen ◽  
Hydroxyl Hydrogen

The conformation of 1,3-disubstituted 1-hydroxyureas Ia-d and 1-hydroxythioureas IIa-d, mostly with aromatic substituents, was investigated by means of dipole moments in dioxan solution and by infrared spectroscopy. The results are concordant for the two classes of compounds. The most populated conformation is near to the planar Z, E, ap form (A), or possibly with the hydroxyl hydrogen out of the N-C-N-O plane (between A and B). This finding from the analysis of dipole moments is corroborated by the presence of the amide-II band and absence of intramolecular hydrogen bonds. While the conformation of hydroxyureas seems to be virtually uniform, in the case of hydroxythioureas a less abundant rotamer may be present in nonpolar solvents, possibly the E, E, sp (G) or E, E, ap (F) form. The conformation found (A) is not explicable in terms of hydrogen bonds and/or steric factors when compared to symmetrically substituted ureas (thioureas) and to N-alkylhydroxamic acids.

Dipole moments and conformation of Schiff bases with intramolecular hydrogen bonds

2000 ◽  
Vol 552 (1-3) ◽  
pp. 193-204 ◽  
Author(s):  
A. Koll ◽  
M. Rospenk ◽  
E. Jagodzińska ◽  
T. Dziembowska
Keyword(s):  
Hydrogen Bonds ◽  
Schiff Bases ◽  
Dipole Moments ◽  
Intramolecular Hydrogen Bonds ◽  
Intramolecular Hydrogen

Controlling emissive properties by intramolecular hydrogen bonds: alkyl and aryl meso‐substituted porphycenes

2021 ◽  
Author(s):  
Jacek Waluk ◽  
Arkadiusz Listkowski ◽  
Natalia Masiera ◽  
Michał Kijak ◽  
Roman Luboradzki ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Intramolecular Hydrogen Bonds ◽  
Intramolecular Hydrogen

Energies of intramolecular hydrogen bonds in some alcohols

1974 ◽  
Vol 20 (3) ◽  
pp. 414-415
Author(s):  
Ya. A. Shuster ◽  
V. A. Granzhan ◽  
P. M. Zaitsev
Keyword(s):  
Hydrogen Bonds ◽  
Intramolecular Hydrogen Bonds ◽  
Intramolecular Hydrogen

Hydrogen bonds in derivatives of N-substituted N’-benzoyl- and N’-(2-chlorobenzoyl)thiourea

1991 ◽  
Vol 56 (4) ◽  
pp. 880-885 ◽  
Author(s):  
Oľga Hritzová ◽  
Dušan Koščík
Keyword(s):  
Hydrogen Bonds ◽  
Spectral Studies ◽  
Intramolecular Hydrogen Bonds ◽  
Tautomeric Forms ◽  
Intramolecular Hydrogen ◽  
Derivatives Of

Intramolecular hydrogen bonds of the N-H···O=C type have been detected in the derivatives of N-substituted N’-benzoyl- and N’-(2-chlorobenzoyl)thiourea on the basis of IR spectral studies. The title compounds can exist in two tautomeric forms.

Spin-spin coupling via intramolecular hydrogen bonds

1985 ◽  
Vol 25 (5) ◽  
pp. 808-810
Author(s):  
L. N. Kurkovskaya ◽  
Yu. M. Chunaev ◽  
N. M. Przhiyalgovskaya
Keyword(s):  
Hydrogen Bonds ◽  
Spin Coupling ◽  
Intramolecular Hydrogen Bonds ◽  
Intramolecular Hydrogen ◽  
Spin Spin Coupling
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