Polarized IR spectra of resonance assisted hydrogen bond (RAHB) in 2-hydroxyazobenzenes

2006 ◽  
Vol 326 (2-3) ◽  
pp. 458-464 ◽  
Author(s):  
Maria Rospenk ◽  
Paulina Majewska ◽  
Boguslawa Czarnik-Matusewicz ◽  
Lucjan Sobczyk
Keyword(s):  
Hydrogen Bond ◽  
Ir Spectra ◽  
Resonance Assisted Hydrogen Bond

Synthesis and Structural Characterisation of New Bifunctional o-Hydroxyacetophenones – Potential Linker Molecules for Coordinative Framework Construction

2013 ◽  
Vol 68 (3) ◽  
pp. 214-222 ◽  
Author(s):  
Jörg Hübscher ◽  
Michael Günthel ◽  
Robert Rosin ◽  
Wilhelm Seichter ◽  
Florian Mertens ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Hydrogen Bonds ◽  
X Ray ◽  
Structural Characterisation ◽  
Crystallographic Study ◽  
Copper Coordination ◽  
Resonance Assisted Hydrogen Bond ◽  
Intramolecular Hydrogen ◽  
Fitting In ◽  
Linker Molecules

Two new linker-type molecules 1a and 1b composed of o-hydroxyacetophenone coordinative groups attached to linear ethynylene or 1,4-phenylenediethynylene spacer units have been synthesised and structurally characterised. An X-ray crystallographic study for both compounds has shown structures with strong intramolecular hydrogen bonds fitting in the model of ‘Intramolecular Resonance Assisted Hydrogen Bond (IRHAB)’. Initial coordination experiments with Cu(II) were performed and the resulting materials characterised by PXRD. The similarity of the copper coordination between these compounds and copper(II) acetylacetonate complexes was demonstrated by XPS measurements. Based on the evidence of these studies, and on elemental analysis, the formation of the corresponding coordination polymers comprising Cu(II) and the linkers has been proposed

Preparation and Research of Polymolybdate/Polymer Composite Membrane by Electrospinning and its Photo-Catalytic Property

2013 ◽  
Vol 395-396 ◽  
pp. 415-418
Author(s):  
Zhi Ming Zhang ◽  
Ting Ting Li ◽  
Ce Liu
Keyword(s):  
Hydrogen Bond ◽  
Ir Spectra ◽  
Composite Membrane ◽  
Phosphomolybdic Acid ◽  
Uv Spectra ◽  
Polarizing Microscopy ◽  
Optimum Parameters ◽  
Anhydrous Alcohol ◽  
Cellulosic Membrane ◽  
Strong Absorption Peak

Composite cellulosic membrane of PMMA and phosphomolybdic acid was prepared by electrospinning. During the progress, the factor of electrospinning and the optimum parameters was found out within the orthogonal combination experiment program. Then the morphology of the composite cellulosic membrane was observed by polarizing microscopy. To resolve PMMA, DMF and anhydrous alcohol were used. When their ratios were 1:1, the diameter of the fibre was the most homogeneous. During the electrospinning, the concentration of PMMA was the most important factor. When the concentrations were less then 10%, there were hardly fibres on the foil. The diameter of the fibre ranged from 0.5 to 1.2 μm along with the increment of the concentration of PMMA. The addition of phosphomolybdic acid made the diameter of the fibre decrease. IR-spectra showed that phosphomolybdic acid kept its Keggin structure, and it interacted with PMMA through hydrogen bond. The composite cellulosic membrane changed its color when imposed in bright space. UV spectra represented that the composite cellulosic membrane had a strong absorption peak at 700nm.

Bonding in Tropolone, 2-Aminotropone, and Aminotroponimine: No Evidence of Resonance-Assisted Hydrogen-Bond Effects

2008 ◽  
Vol 14 (14) ◽  
pp. 4225-4232 ◽  
Author(s):  
Pablo Sanz ◽  
Otilia Mó ◽  
Manuel Yáñez ◽  
José Elguero
Keyword(s):  
Hydrogen Bond ◽  
Resonance Assisted Hydrogen Bond

An infrared study of the interaction between ethyl N-(diphenylmethylene)glycinate with proton donors: comparison with N-benzylidenemethylamine

1986 ◽  
Vol 64 (12) ◽  
pp. 2305-2309 ◽  
Author(s):  
Marleen Ruysen ◽  
Thérèse Zeegers-Huyskens
Keyword(s):  
Hydrogen Bond ◽  
Ir Spectra ◽  
Equilibrium Constants ◽  
Lone Pair ◽  
Imino Group ◽  
Infrared Study ◽  
Hydrogen Bond Formation ◽  
Hydroxy Proton ◽  
Proton Donors ◽  
Intramolecular Hydrogen

The interaction between ethyl N-(diphenylmethylene)glycinate (DPG) and hydroxy proton donors or pyrrole has been investigated by ir spectrometry. The equilibrium constants, enthalpies, and entropies of complex formation have been determined in carbon tetrachloride solution and compared with the data obtained for the complexes involving N-benzylidene-methylamine and the same proton donors. The ir spectra studied mainly in the νOH, νC=N, νC=O, and νC—O regions suggest that hydrogen bond formation occurs at the N atom of the imino group and at the O atom of the carbonyl group. The results are discussed in terms of the basicity at the two acceptor sites and of the accessibility of the lone pair of electrons. The ir spectra of the solid adduct of DPG with HCl show that protonation takes place on the N atom. The protonated structure is possibly stabilized by an intramolecular hydrogen bond.

Stereospecific Synthesis ofC2Symmetric Diamines from the Mother Diamine by Resonance-Assisted Hydrogen-Bond Directed Diaza-Cope Rearrangement

2008 ◽  
Vol 130 (36) ◽  
pp. 12184-12191 ◽  
Author(s):  
Hyunwoo Kim ◽  
Yen Nguyen ◽  
Cindy Pai-Hui Yen ◽  
Leonid Chagal ◽  
Alan J. Lough ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Stereospecific Synthesis ◽  
Cope Rearrangement ◽  
Resonance Assisted Hydrogen Bond

Rotational Isomers, Intramolecular Hydrogen Bond, and IR Spectra of o-Vinylphenol

2014 ◽  
Vol 81 (1) ◽  
pp. 15-22 ◽  
Author(s):  
V. P. Glazunov ◽  
D. V. Berdyshev ◽  
N. N. Balaneva ◽  
O. S. Radchenko ◽  
V. L. Novikov
Keyword(s):  
Hydrogen Bond ◽  
Ir Spectra ◽  
Intramolecular Hydrogen Bond ◽  
Rotational Isomers ◽  
Intramolecular Hydrogen
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