Control of the intermolecular photodimerization of anthracene derivatives by hydrogen bonding of urea groups in dilute solution

2016 ◽  
Vol 15 (8) ◽  
pp. 1071-1079 ◽  
Author(s):  
Hisato Matsumoto ◽  
Yoshinobu Nishimura ◽  
Tatsuo Arai
Keyword(s):  
Hydrogen Bonding ◽  
Dilute Solution ◽  
Substitution Site ◽  
Anthracene Derivatives ◽  
Urea Compounds

The control of the photodimerization reaction of anthracene–urea compounds was achieved by (1) aggregate conformation depending on the substitution site and (2) inhibition of aggregation by the addition of TBAAc.

Substitution site effect of naphthyl substituted anthracene derivatives and their applications in organic optoelectronics

2020 ◽  
Vol 8 (44) ◽  
pp. 15597-15602
Author(s):  
Jie Li ◽  
Deyang Ji ◽  
Yongxu Hu ◽  
Mingxi Chen ◽  
Jinyu Liu ◽  
...  
Keyword(s):  
Site Effect ◽  
Molecular Packing ◽  
Optoelectronic Properties ◽  
Organic Optoelectronics ◽  
Substitution Site ◽  
Significant Difference ◽  
Anthracene Derivatives

Two different naphthyl substituted anthracene derivatives were synthesized. A tiny change of the substitution site of the naphthyl group leads to a significant difference of the molecular packing and exerts great impact on optoelectronic properties.

scholarly journals Crystal structure of 4-carbamoylpyridinium chloride

2016 ◽  
Vol 72 (4) ◽  
pp. 436-439 ◽  
Author(s):  
Simon M. Fellows ◽  
Timothy J. Prior
Keyword(s):  
Hydrogen Bonding ◽  
Dilute Solution ◽  
Asymmetric Unit ◽  
Monoclinic Symmetry ◽  
Hydrochloride Salt ◽  
Hydrogen Bonding Interactions ◽  
Linear Chains ◽  
Symmetry Space ◽  
Chloride Interaction ◽  
Symmetry Space Group

The hydrochloride salt of isonicotinamide, C6H7N2O+·Cl−, has been synthesized from a dilute solution of hydrochloric acid in acetonitrile. The compound displays monoclinic symmetry (space groupC2/c) at 150 K, similar to the related hydrochloride salt of nicotinamide. The asymmetric unit contains one protonated isonicotinamide molecule and a chloride anion. An array of hydrogen-bonding interactions, including a peculiar bifurcated pyridinium–chloride interaction, results in linear chains running almost perpendicularly in the [150] and [1-50] directions within the structure. A description of the hydrogen-bonding network and comparison with similar compounds are presented.

HYDROGEN BONDING IN SOLUTIONS OF SUBSTITUTED ACETIC ACIDS

1961 ◽  
Vol 39 (8) ◽  
pp. 1711-1720 ◽  
Author(s):  
Leonard W. Reeves
Keyword(s):  
Hydrogen Bonding ◽  
Chemical Shift ◽  
Carboxylic Acids ◽  
Trifluoroacetic Acid ◽  
Dimethyl Formamide ◽  
Acid Solutions ◽  
Dilute Solution ◽  
Acid Proton ◽  
Solvent Molecules ◽  
Acetic Acids

The changes in chemical shift of the acid proton in some simple carboxylic acids on dilution in four solvents has been studied. The existence of chainlike hydrogen-bonded polymers in solution is suggested by the results. The association of the monomer molecules in dilute solution with donor centers in the solvent molecules is suggested from a study of the —O—H monomer stretching bond in the vapor and in two solvents. There is a difference in the behavior of acetic and trifluoroacetic acid in N-methyl and N,N-dimethyl formamide, which has been explained in terms of protonation of the amides in trifluoroacetic acid solutions.

scholarly journals Evaluating hydrogen bonding control in the diastereoselective Diels–Alder reactions of 9-(2-aminoethyl)-anthracene derivatives

2015 ◽  
Vol 13 (42) ◽  
pp. 10569-10577 ◽  
Author(s):  
R. A. Bawa ◽  
F.-M. Gautier ◽  
H. Adams ◽  
A. J. H. M. Meijer ◽  
S. Jones
Keyword(s):  
Hydrogen Bonding ◽  
Dft Calculations ◽  
Diels Alder ◽  
Anthracene Derivatives

Hydrogen bonding can be used to control the stereoselectivity of the cycloaddition of some anthracene derivatives. DFT calculations provide support for the origins of the selectivity in these reactions.

Infrared Study of 4-Substituted Benzaldehydes in Dilute Solution in Various Solvents: The Carbonyl Stretching Mode

1992 ◽  
Vol 46 (2) ◽  
pp. 306-316 ◽  
Author(s):  
Richard A. Nyquist
Keyword(s):  
Hydrogen Bonding ◽  
Functional Groups ◽  
Phenyl Group ◽  
Electronic System ◽  
Fermi Resonance ◽  
Intermolecular Hydrogen Bonding ◽  
Dilute Solution ◽  
Infrared Study ◽  
Solvent Interactions ◽  
Substituted Benzaldehydes

The carbonyl stretching mode in some of the 4- x-benzaldehydes is in Fermi resonance with an overtone of a fundamental which occurs at lower frequency. In general, the unperturbed vC=O frequencies for 4- x-benzaldehydes do appear to correlate with the σp values of the 4- x atom or group. The AN values of the solvents show a pseudo-correlation with the carbonyl and vasym. NO2 stretch vibrations of 4- x-benzaldehyde. However, neither σp nor AN values appear to take into account solute/solvent interactions such as intermolecular hydrogen bonding with the C=O group and with other sites in the molecule such as the phenyl group π system and with the electronic system of other functional groups, since the points in each plot do not correlate in the exact manner in each case.

Effect of Hydrogen Bonding on the Amide II Band of Model Disubstituted Urea Compounds

2009 ◽  
Vol 63 (12) ◽  
pp. 1409-1413 ◽  
Author(s):  
Josh L. Gray ◽  
Cara M. Barnes ◽  
Andrew J. Carr ◽  
Karla S. McCain
Keyword(s):  
Hydrogen Bonding ◽  
Urea Compounds

Computer averaging of lattice images of poly-4-methyl-pentene-1 (P4mp1): Noise created artifacts

1987 ◽  
Vol 45 ◽  
pp. 388-389
Author(s):  
P. Pradère ◽  
J.F. Revol ◽  
R. St. John Manley
Keyword(s):  
Low Dose ◽  
Polymer Concentration ◽  
Processing System ◽  
Limiting Factor ◽  
Dilute Solution ◽  
New Techniques ◽  
Dose Unit ◽  
Lattice Images ◽  
Dose Imaging ◽  
Imaging Conditions

Although radiation damage is the limiting factor in HREM of polymers, new techniques based on low dose imaging at low magnification have permitted lattice images to be obtained from very radiation sensitive polymers such as polyethylene (PE). This paper describes the computer averaging of P4MP1 lattice images. P4MP1 is even more sensitive than PE (total end point dose of 27 C m-2 as compared to 100 C m-2 for PE at 120 kV). It does, however, have the advantage of forming flat crystals from dilute solution and no change in d-spacings is observed during irradiation.Crystals of P4MP1 were grown at 60°C in xylene (polymer concentration 0.05%). Electron microscopy was performed with a Philips EM 400 T microscope equipped with a Low Dose Unit and operated at 120 kV. Imaging conditions were the same as already described elsewhere. Enlarged micrographs were digitized and processed with the Spider image processing system.

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