Study of D-glyceraldehyde by circular dichroism and ultraviolet spectroscopy

1981 ◽  
Vol 46 (1) ◽  
pp. 240-245 ◽  
Author(s):  
Slavomír Bystrický ◽  
Tibor Sticzay ◽  
Mária Poláková ◽  
Michal Fedoroňko
Keyword(s):  
Circular Dichroism ◽  
Quantum Chemical ◽  
Conformational Equilibrium ◽  
Uv Spectroscopy ◽  
Spatial Arrangement ◽  
Chemical Calculation ◽  
Rotational Strength ◽  
Circular Dichroïsm ◽  
Oligomeric Forms ◽  
Circular Dichroic

The behaviour of D-glyceraldehyde in water, dimethyl sulfoxide, their mixtures and in 1,1,1,3,3,3-hexafluoro-2-propanol was studied by circular dichroism and UV spectroscopy in the 20-80°C temperature range. Fresh-prepared solutions of D-glyceraldehyde exist in a substantial measure in dimeric or oligomeric forms, which passed to a monomeric one. The different character of interaction of solvents with monomeric D-glyceraldehyde is discussed. The bisignate circular dichroic curves are associated with conformational equilibrium of rotamers. The presumption on their spatial arrangement is confronted with the quantum chemical calculation of the rotational strength.

Chiroptical properties of monosaccharide acetyl derivatives

1985 ◽  
Vol 50 (3) ◽  
pp. 683-689
Author(s):  
Slavomír Bystrický ◽  
Tibor Sticzay ◽  
Štefan Kučár ◽  
Eva Petráková ◽  
Rudolf Toman
Keyword(s):  
Circular Dichroism ◽  
Dipole Moments ◽  
Spatial Arrangement ◽  
Positional Isomers ◽  
Optical Rotatory ◽  
Chiroptical Properties ◽  
Rotational Strength ◽  
Circular Dichroïsm ◽  
Optical Rotatory Strength

Circular dichroism of positional isomers of acetylated methyl β-D-xylopyranosides, 1,6-anhydro-β-D-glucopyranoses and methyl α-L-rhamnopyranosides is discussed considering the mechanism of optical rotatory strength nature. Interactions determining the signs are influenced by the character of the solvent. Magnitude of the effect depends on the spatial arrangement of the chromophore environment. This effect is lowered with diacetyl derivatives, where the interaction of transitional dipole moments of acetyl groups is the main source of optical rotational strength.

Organic photodiodes from homochiral l-proline derived squaraine compounds with strong circular dichroism

2017 ◽  
Vol 19 (10) ◽  
pp. 6996-7008 ◽  
Author(s):  
Matthias Schulz ◽  
Majvor Mack ◽  
Oliver Kolloge ◽  
Arne Lützen ◽  
Manuela Schiek
Keyword(s):  
Circular Dichroism ◽  
Polarized Light ◽  
Active Layers ◽  
Circular Dichroïsm ◽  
Circular Dichroic ◽  
Circular Polarized Light

We demonstrate the feasibility of inserting highly circular dichroic active layers into an organic photodiode as a potential detector for circular polarized light.

The Assignment of Absolute Stereostructures through Quantum Chemical Circular Dichroism Calculations

2009 ◽  
Vol 2009 (17) ◽  
pp. 2717-2727 ◽  
Author(s):  
Gerhard Bringmann ◽  
Torsten Bruhn ◽  
Katja Maksimenka ◽  
Yasmin Hemberger
Keyword(s):  
Circular Dichroism ◽  
Quantum Chemical ◽  
Circular Dichroïsm

Solvent-dependent circular dichroism of trans-disubstituted Bis(R-propane-1,2-diamine)cobalt(III) complexes

1977 ◽  
Vol 30 (10) ◽  
pp. 2115 ◽  
Author(s):  
CJ Hawkins ◽  
GA Lawrance ◽  
RM Peachey
Keyword(s):  
Circular Dichroism ◽  
Metal Ion ◽  
Ion Association ◽  
Positive Contribution ◽  
Circular Dichroism Spectra ◽  
Hydrogen Bond Formation ◽  
Rotational Strength ◽  
Solvent Dependence ◽  
Halide Salts ◽  
Circular Dichroïsm

The circular dichroism spectra of trans-disubstituted bis(R-propane- 1,2-diamine)cobalt(III) complexes are reported for an extended series of solvents. The observed variations in the spectra of the dichloro and dibromo complexes are analysed in terms of stereoselective solvation at the diamine N-H protons, and also the ion association between the complexes and their counter-ions. The solvation of these dihalo complexes, which was studied by p.m.r., showed a preference for hydrogen-bond formation with the equatorial N-H protons, rendering the donor nitrogens asymmetric and thus introducing a new source of dissymmetry close to the metal ion chromophore. This affected a decrease in the positive rotational strength of the 1A1g → 1Eg (D4h) transition, and a positive contribution to the rotational strength of the 1A1g → 1A2g (D4h) component. Ion association of the dihalo complexes was evaluated by a comparison of the circular dichroism of the tetraphenylborate and halide salts. ��� The tendency for ion association was much greater for the tripositive diammine complex. However, stereospecific solvation was of little importance and the circular dichroism spectra did not show any marked solvent dependence for the tetraphenylborate salt.

scholarly journals Three New Biflavonoids from Chinese Dragon's Blood, Dracaena cochinchinensis

2012 ◽  
Vol 7 (5) ◽  
pp. 1934578X1200700 ◽  
Author(s):  
Jing Guan ◽  
Shun-Xing Guo
Keyword(s):  
Quantum Chemical Calculation ◽  
Quantum Chemical ◽  
Chemical Calculation ◽  
Dragon’S Blood ◽  
Esi Ms ◽  
H Nmr ◽  
Cd Spectrum ◽  
The Absolute ◽  
Circular Dichroïsm ◽  
C Nmr

Three new biflavonoids, named (2 Rγ S)-3′-methoxy-8-methylsocotrin-4′-ol (1), (2 Sγ R)-3′-methoxy-8-methylsocotrin-4′-ol (2), and (2 Rγ R)-8-methylsocotrin-4′-ol (3), were isolated from Chinese Dragon's blood [Dracaena cochinchinensis (Lour.) S. C. Chen], together with two known ones. The structures of these new biflavonoids were elucidated by a combination of HR-ESI-MS, 1H NMR, 13C NMR, HMQC, and HMBC spectra. The absolute configurations of compounds 1-4 were determined by quantum chemical calculation of the circular dichroism spectrum and comparison with the experimental CD spectrum.

Vibrational Circular Dichroism and Theoretical Study of the Conformational Equilibrium in (−)-S-Nicotine

ChemPhysChem ◽  
2014 ◽  
Vol 16 (2) ◽  
pp. 342-352 ◽  
Author(s):  
Pilar Gema Rodríguez Ortega ◽  
Manuel Montejo ◽  
Juan Jesus López González
Keyword(s):  
Circular Dichroism ◽  
Conformational Equilibrium ◽  
Theoretical Study ◽  
Vibrational Circular Dichroism ◽  
Circular Dichroïsm
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