FT-IR study of the proton polarizability of hydrogen bonds and of the hydrogen-bonded systems in a di-Mannich base of 5,5′-dimethoxy-2,2′-biphenol

1998 ◽  
Vol 470 (3) ◽  
pp. 335-339 ◽  
Author(s):  
Bogumil Brzezinski ◽  
Grzegorz Wojciechowski ◽  
Hanna Urjasz ◽  
Georg Zundel
Keyword(s):  
Hydrogen Bonds ◽  
Mannich Base ◽  
Ft Ir ◽  
Ir Study ◽  
Hydrogen Bonded Systems ◽  
Hydrogen Bonded

Apicophilicity versus Hydrogen Bonding. Intramolecular Coordination and Hydrogen Bonds in N-[(Hydroxydimethylsilyl)methyl]-N,N′-propyleneurea and Its Hydrochloride. DFT and FT-IR Study and QTAIM and NBO Analysis

2014 ◽  
Vol 33 (10) ◽  
pp. 2641-2652 ◽  
Author(s):  
Nina N. Chipanina ◽  
Nataliya F. Lazareva ◽  
Tamara N. Aksamentova ◽  
Alexey Yu. Nikonov ◽  
Bagrat A. Shainyan
Keyword(s):  
Hydrogen Bonding ◽  
Hydrogen Bonds ◽  
Nbo Analysis ◽  
Intramolecular Coordination ◽  
Ft Ir ◽  
Ir Study

Moisture uptake in native cellulose – the roles of different hydrogen bonds: a dynamic FT-IR study using Deuterium exchange

Cellulose ◽  
2006 ◽  
Vol 13 (2) ◽  
pp. 131-145 ◽  
Author(s):  
Karin Hofstetter ◽  
Barbara Hinterstoisser ◽  
Lennart Salmén
Keyword(s):  
Hydrogen Bonds ◽  
Deuterium Exchange ◽  
Moisture Uptake ◽  
Native Cellulose ◽  
Ft Ir ◽  
Ir Study

Cyclic Hydrogen-Bonded System with Large Proton Polarizability in CalixarenesAn FT-IR Study

1996 ◽  
Vol 100 (21) ◽  
pp. 9021-9023 ◽  
Author(s):  
Bogumil Brzezinski ◽  
Hanna Urjasz ◽  
Georg Zundel
Keyword(s):  
Ft Ir ◽  
Ir Study ◽  
Hydrogen Bonded

Proton transfer in hydrogen bonded systems

1960 ◽  
Vol 257 (1288) ◽  
pp. 98-108 ◽  
Keyword(s):  
Hydrogen Bond ◽  
Absorption Band ◽  
Hydrogen Bonds ◽  
Proton Transfer ◽  
Direct Result ◽  
Isotopic Substitution ◽  
Association Energy ◽  
Hydrogen Bonded Systems ◽  
Hydrogen Bonded

Evidence is presented that proton transfer occurs in certain special types of hydrogen bond and that as a direct result the association energy is increased. It is probable that this effect is also responsible for a t least a part of the broadening of the v XH absorption band. In support of this, a number of com pounds are described in which the hydrogen bonds are weakened by isotopic substitution. The implications of these findings are discussed.

FT-IR study of UV-induced isomerization of intramolecularly hydrogen-bonded carbonyl compounds isolated in xenon matrices

1990 ◽  
Vol 175 (6) ◽  
pp. 655-659 ◽  
Author(s):  
P. Roubin ◽  
T. Chiavassa ◽  
P. Verlaque ◽  
L. Pizzala ◽  
H. Bodot
Keyword(s):  
Carbonyl Compounds ◽  
Ft Ir ◽  
Ir Study ◽  
Hydrogen Bonded

π-Bond cooperativity and anticooperativity effects in resonance-assisted hydrogen bonds (RAHBs)

2006 ◽  
Vol 62 (5) ◽  
pp. 850-863 ◽  
Author(s):  
Valerio Bertolasi ◽  
Loretta Pretto ◽  
Gastone Gilli ◽  
Paola Gilli
Keyword(s):  
Hydrogen Bonds ◽  
Local Defect ◽  
Bond Polarity ◽  
X Ray ◽  
Extensive Analysis ◽  
Cooperativity Effects ◽  
Structural Database ◽  
Hydrogen Bonded Systems ◽  
Hydrogen Bonded

Bond cooperativity effects, which are typical of `resonant' chains or rings of π-conjugated hydrocarbons, can also occur in hydrogen-bonded systems in the form of σ-bond and π-bond cooperativity or anticooperativity. σ-Bond cooperativity is associated with the long chains of O—H...O bonds in water and alcohols while σ-bond anticooperativity occurs when the cooperative chain is interrupted by a local defect reversing the bond polarity. π-Bond cooperativity is the driving force controlling resonance-assisted hydrogen bonds (RAHBs), while π-bond anticooperativity has never been considered so far and is investigated here by studying couples of hydrogen-bonded β-enolone and/or β-enaminone six-membered rings fused through a common C=O or C—C bond. The effect is studied by X-ray crystal structure determination of five compounds [(2Z)-1-(2-hydroxyphenyl)-3-phenyl-1,3-propanedione enol (1), (2Z)-1-(2-hydroxy-5-chlorophenyl)-3-phenyl-1,3-propanedione enol (2), (2Z)-1-(2-hydroxy-5-methylphenyl)-3-phenyl-1,3-propanedione enol (3), (2Z)-1-(2-hydroxy-4-methyl-5-chlorophenyl)-3-phenyl-1,3-propanedione enol (4) and dimethyl(2E)-3-hydroxy-2-{[(4-chlorophenyl)amino]carbonyl}pent-2-enedioate (5)] and by extensive analysis of related fragments found in the CSD (Cambridge Structural Database). It is shown that fusion through the C=O bond is always anticooperative and such to weaken the symmetric O—H...O...H—O and N—H...O...H—N bonds formed, but not the asymmetric O—H...O...H—N bond. Fusion through the C—C bond may produce either cooperative or anticooperative hydrogen bonds, the former being more stable than the latter and giving rise to a unique resonance-assisted ten-membered ring running all around the two fused six-membered rings, which can be considered a type of tautomerism never described before.

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