Circular dichroism of benzylidene derivatives of glycerol and mannitol

1977 ◽  
Vol 30 (11) ◽  
pp. 2465 ◽  
Author(s):  
RM Carman ◽  
CJ Hawkins ◽  
JJ Kibby
Keyword(s):  
Circular Dichroism ◽  
Ring Systems ◽  
Cotton Effects ◽  
Derivatives Of ◽  
Circular Dichroïsm

The c.d. spectra are reported for a series of benzylidene derivatives of glycerol and mannitol containing 1,3-dioxolan, 1,3-dioxan and 1,3- dioxepan ring systems. The signs of the Cotton effects of 1Lb and 1La transitions of the phenyl chromophore have been rationalized in terms of recently proposed sector rules for these transitions.

scholarly journals Liposomal Circular Dichroism (L-CD) of Arenoyl Derivatives of Sphingolipids. Amplification of Cotton Effects in Ordered Lipid Bilayers

Marine Drugs ◽  
2017 ◽  
Vol 15 (12) ◽  
pp. 352 ◽  
Author(s):  
Tadeusz Molinski ◽  
Caroline Broaddus ◽  
Brandon Morinaka
Keyword(s):  
Circular Dichroism ◽  
Lipid Bilayers ◽  
Cotton Effects ◽  
Derivatives Of ◽  
Circular Dichroïsm

Optically Active Amines. Part XIII. Circular Dichroism of the N-Salicylidene Derivatives of Alkylamines

1971 ◽  
Vol 49 (17) ◽  
pp. 2902-2906 ◽  
Author(s):  
Howard E. Smith ◽  
Harry E. Ensley
Keyword(s):  
Circular Dichroism ◽  
Phenyl Group ◽  
Electron System ◽  
Optically Active ◽  
Rotational Strength ◽  
Cotton Effects ◽  
Derivatives Of ◽  
Circular Dichroïsm

Comparison of the c.d. spectra of (S)-(+)-N-salicylidene-α-phenylethylamine with those of (S)-(+)-N-salicylidene-sec-butylamine and (R)-(−)-N-salicylidene-2,2-dimethyl-3-aminobutane confirms the conclusion that the strong rotational strength shown by N-salicylidene-α- and β-phenylalkylamines is due to an interaction of the π-electron System of the phenyl group and the salicylidenimino chromophore. The sign of the Cotton effects near 255 and 315 nm shown by the N-salicylidenes of alkylamines and cycloalkylamines, when these are conformationally defined, can be correlated with their absolute configurations using a planar sector rule, similar to that used for the interpretation of the c.d. and o.r.d. spectra of N-salicylidene-α- and β-phenylalkylamines.

Circular dichroism spectra of tetraamminecobalt(III) complexes of amino alcohols

1978 ◽  
Vol 31 (11) ◽  
pp. 2399 ◽  
Author(s):  
CJ Hawkins ◽  
GA Lawrance ◽  
JA Palmer
Keyword(s):  
Circular Dichroism ◽  
Chemical Shift ◽  
Chemical Shifts ◽  
Amino Alcohols ◽  
Circular Dichroism Spectra ◽  
Chemical Shift Difference ◽  
Solvent Dependence ◽  
Cotton Effects ◽  
Circular Dichroïsm ◽  
Chiral Amino Alcohols

The circular dichroism spectra are reported for tetraamminecobalt(III) complexes with the chiral amino alcohols 2-aminopropan-1-ol, 2- aminobutan-1-ol, 1-aminopropan-2-ol, 2-amino-1-phenyl-ethanol, ψ- ephedrine and ephedrine with the alcohol groups protonated (OH) and deprotonated (O-). The solvent dependence of the chemical shifts of the NH protons was investigated to determine the effects of stereoselective solvation on the circular dichroism, but, in contrast to some other related systems, the chemical shift difference between the two NH2 protons was relatively insensitive to solvent. Consistent with this, the circular dichroism spectra of the tetraphenylborate salts of the deprotonated complexes were found not to be markedly dependent on solvent. Tetraammine-{(-)-ψ-ephedrine)cobalt(III) and tetraammine{(-)- ephedrine}cobalt(III) were found to have the same signs of Cotton effects for the various d-d transitions, whereas bis{(-)-ψ- ephedrine}copper(II) and bis{(-)-ephedrine}copper(II) had opposite signs. This has been explained in terms of different conformer populations in the cobalt(III) and copper(II) systems.

Circulardichroismusuntersuchungen von Polyalkohol- und Zucker-Vanadat(V)-Komplexen / Circular Dichroism Studies of Polyalcohol and Sugar Vanadate(V) Complexes

1989 ◽  
Vol 44 (11) ◽  
pp. 1464-1472 ◽  
Author(s):  
Hermann Bauer ◽  
Jeanine Brun ◽  
Alexius R. Hernanto ◽  
Wolfgang Voelter ◽  
Spyridon Paraskewas
Keyword(s):  
Circular Dichroism ◽  
Wavelength Range ◽  
Optically Active ◽  
Hydroxyl Groups ◽  
Pyranose Ring ◽  
Cotton Effects ◽  
Circular Dichroïsm

The complexes of tetravanadate ions with optically active polyols and carbohydrates with suitable steric properties show up to four separate cotton effects in the wavelength range of λ = 200-350 nm. Thus it is possible to classify pyranoses into four groups according to their circular dichroitic behaviour and determine the configuration and the conformation of the hydroxyl groups attached to the pyranose ring.

Circular dichroism spectra of amino acid complexes. II. Chelated amino acid complexes with the CoN5O chromophore

1970 ◽  
Vol 23 (9) ◽  
pp. 1735 ◽  
Author(s):  
CJ Hawkins ◽  
PJ Lawson
Keyword(s):  
Amino Acids ◽  
Circular Dichroism ◽  
Amino Acid ◽  
Visible Region ◽  
Optically Active ◽  
Circular Dichroism Spectra ◽  
Amino Acid Complexes ◽  
Similar Series ◽  
Cotton Effects ◽  
Circular Dichroïsm

The circular dichroism spectra of a series of optically active (α-aminocarboxylato)tetraamminecobalt(111) complexes have been measured in aqueous solution, and in the presence of salts of polarizable anions. The observed spectra in the visible region have been analysed to determine the signs of the Cotton effects of the three components of the 1A1g ↔ 1T1g cobalt(111) transition. For L-amino acids, the transition with A2g(D4h) parentage is negative, and the two transitions with Eg(D4h) parentage have opposite signs. Published circular dichroism spectra of complexes of the type [Co(en)2(L-am)]2+ were similarly interpreted in terms of a perturbed tetragonal chromophore, and it was shown that the vicinal effect of the L-amino acids imposed the same signs onto the component transitions as for the tetraammines and for a similar series of pentaamminecobalt(111) complexes.

scholarly journals Vibrational circular dichroism as a probe of solid‐state organisation of derivatives of cyclic β‐amino acids: Cis ‐ and trans ‐2‐aminocyclobutane‐1‐carboxylic acid

Chirality ◽  
2019 ◽  
Vol 31 (8) ◽  
pp. 547-560 ◽  
Author(s):  
Valérie Declerck ◽  
Ariel Pérez‐Mellor ◽  
Régis Guillot ◽  
David J. Aitken ◽  
Michel Mons ◽  
...  
Keyword(s):  
Amino Acids ◽  
Circular Dichroism ◽  
Solid State ◽  
Carboxylic Acid ◽  
Vibrational Circular Dichroism ◽  
Cis And Trans ◽  
Derivatives Of ◽  
Circular Dichroïsm

Circular Dichroism, XC. CD of 1-Cyano Derivatives of Pyranoses

1989 ◽  
Vol 1989 (6) ◽  
pp. 599-600 ◽  
Author(s):  
IstváN Farkas ◽  
LÁSzló Somsák ◽  
Günther Snatzke
Keyword(s):  
Circular Dichroism ◽  
Derivatives Of ◽  
Circular Dichroïsm
Sign in / Sign up

Export Citation Format

Share Document