Mesophases induced by hydrogen bonds between non-mesogens A di-proton acceptor and proton donors

1993 ◽  
Vol 14 (3) ◽  
pp. 829-835 ◽  
Author(s):  
L. J. Yu ◽  
J. S. Pan
Keyword(s):  
Hydrogen Bonds ◽  
Proton Acceptor ◽  
Proton Donors

FT-infrared study of the interaction between all-trans retinylidene isopropylamine and model proton donors

1992 ◽  
Vol 70 (11) ◽  
pp. 2717-2721 ◽  
Author(s):  
P. Migchels ◽  
Th. Zeegers-Huyskens
Keyword(s):  
Carbon Tetrachloride ◽  
Hydrogen Bonds ◽  
Proton Transfer ◽  
Spectral Characteristics ◽  
Proton Acceptor ◽  
Infrared Spectrometry ◽  
Transfer Constant ◽  
Infrared Study ◽  
Proton Donors ◽  
Integrated Intensity

The interaction between all-trans retinylidene isopropylamine (tRiPA) and phenols covering a large pKa domain is investigated by FT-infrared spectrometry. For phenols having pKa between 10.2 and 8.18, only normal OH … N hydrogen bonds are formed. The thermodynamic parameters (K, −ΔH, −ΔS0) determined in carbon tetrachloride solution show that tRiPA possesses a good proton acceptor ability. The spectral characteristics (frequency and integrated intensity) of the νC=N vibration are also investigated. From a pKa of 6, proton transfer takes place. The proton transfer constants determined in 1,2-dichloroethane are linearly related to ΔpKa (pKa of the protonated base minus pKa of the phenol). Comparison with previously studied imine systems shows that the proton transfer constant increases with the number of C=C double bonds in the base.

Intramolecular hydrogen bonds and the orientation of amino groupsin o-phenylenediamines

1967 ◽  
Vol 45 (19) ◽  
pp. 2135-2141 ◽  
Author(s):  
P. J. Krueger
Keyword(s):  
Hydrogen Bond ◽  
Hydrogen Bonds ◽  
Infrared Absorption ◽  
Substituent Effect ◽  
Proton Donor ◽  
Proton Acceptor ◽  
Amino Groups ◽  
Intramolecular Hydrogen Bonds ◽  
Infrared Absorption Spectra ◽  
Intramolecular Hydrogen

The infrared absorption spectra of partially deuterated o-phenylenediamine and 4,5-di-methyl-, 4-methyl-, and 4-chloro-o-phenylenediamine in dilute CCl4 solution show double intramolecular [Formula: see text] hydrogen bonds in which the two NHD groups are equivalent and each group acts as both a proton donor and a proton acceptor. The ring substituent effect on this interaction in these compounds is small. In 4-methoxy-o-phenylenediamine, the amino groups are not equivalent, but double intramolecular hydrogen bonds are still present. In 4-nitro-o-phenylenediamine, only one intramolecular [Formula: see text] hydrogen bond appears to exist. The effect of N-substitution on some of these observations is discussed.

ChemInform Abstract: Problems of Unusual Hydrogen Bonds Between Proton Donors and Hydrides of Transition Metals and Boron

ChemInform ◽  
2010 ◽  
Vol 29 (35) ◽  
pp. no-no
Author(s):  
E. S. SHUBINA ◽  
N. V. BELKOVA ◽  
E. V. BAKHMUTOVA ◽  
L. N. SAITKULOVA ◽  
A. V. IONIDIS ◽  
...  
Keyword(s):  
Transition Metals ◽  
Hydrogen Bonds ◽  
Proton Donors

Blue-shifted Hydrogen Bonds with Proton-donors Incapable of Rehybridization

2003 ◽  
Vol 32 (8) ◽  
pp. 746-747 ◽  
Author(s):  
Jin-Ti Wang ◽  
Yong Feng ◽  
Lei Liu ◽  
Xiao-Song Li ◽  
Qing-Xiang Guo
Keyword(s):  
Hydrogen Bonds ◽  
Proton Donors

Hydrocarbons as proton donors in C–H⋯N and C–H⋯S hydrogen bonds

2010 ◽  
Vol 367 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Małgorzata Domagała ◽  
Sławomir J. Grabowski
Keyword(s):  
Hydrogen Bonds ◽  
Proton Donors

Hydrogen Bonds and FTIR Peaks of Polyether Polyurethane-Urea

2019 ◽  
Vol 815 ◽  
pp. 151-156
Author(s):  
Xu Zhao ◽  
Yu Hong Qi ◽  
Ke Jiao Li ◽  
Zhan Ping Zhang
Keyword(s):  
Hydrogen Bonding ◽  
Hydrogen Bonds ◽  
Steric Effect ◽  
Electronic Effect ◽  
Theoretical Foundation ◽  
Microphase Separation ◽  
Ether Linkage ◽  
Proton Donors ◽  
Hard Segments ◽  
Degree Of Order

Various types of hydrogen bonds exist in polyether polyurethane, polyurethane-urea and polyurea (PUA) and can cause microphase separation. The morphology, properties and applications of polyether PUA are determined by the microphase separation. All kinds of hydrogen bonds make it difficult to assignments of Fourier transform infrared spectroscopy (FTIR) peaks of ether linkage, amine and carbonyl group. This affects the calculation of the hydrogen bonding degree of the hard segments for estimating the degree of microphase separation. This paper summarized hydrogen bonding structures between proton donors and proton acceptors. By analyzing the influence of electronic effect, steric effect, various types of hydrogen bonds and the degree of order of hydrogen bonding on infrared peaks, the relationships between hydrogen bonding structures and infrared peaks are established. Lay the theoretical foundation for evaluating the degree of microphase separation by FTIR method.

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