Intermolecular exciton coupling and vibronic effects in solid-state circular dichroism: a case study

2013 ◽  
Vol 15 (3) ◽  
pp. 795-802 ◽  
Author(s):  
Gennaro Pescitelli ◽  
Daniele Padula ◽  
Fabrizio Santoro
Keyword(s):  
Circular Dichroism ◽  
Solid State ◽  
Exciton Coupling ◽  
Circular Dichroïsm ◽  
Vibronic Effects

Circular dichroism and infrared study of β-turn formation in repeat peptides of elastin

1987 ◽  
Vol 52 (5) ◽  
pp. 1356-1361
Author(s):  
S. Abdel Rahman ◽  
M. Elsafty ◽  
A. Hattaba
Keyword(s):  
Circular Dichroism ◽  
Solid State ◽  
Ir Spectra ◽  
Chain Length ◽  
Room Temperature ◽  
Infrared Study ◽  
Feature Characteristic ◽  
C 50 ◽  
The Stability ◽  
Circular Dichroïsm

The conformation of elastin-like peptides Boc-Ala-Pro-Gly-Val-APEGM, Boc-Ala-Pro-Gly-Val-Gly-Val-APEGM, Boc-Ala-Pro-Gly-Val-Ala-Pro-Gly-Val-Gly-Val-APEGM, Boc-Ala-Pro-Gly-Val-Gly-Val-Ala-Pro-Gly-Val-Gly-Val-APEGM were examined in solution using circular dichroism at 30 °C, 50 °C, and 70 °C and in solid state by IR at room temperature. The studies show that the β-turn is a significant conformational feature for peptides under investigation in solution at 30 °C and 50 °C, but at 70 °C the tetra, hexa, and decapeptides show the CD feature characteristic of the β-structure while the dodecapeptide spectra show the presence of β-turn which indicates the stability of the β-turn at this chain length. The IR spectra show that in the solid state at room temperature all investigated peptides assume essentially a β-turn except the tetrapeptide which present evidence of antiparallel β-structure. The β-turn contribution in the IR spectra increases with the increase of the chain length of the peptide.

Unique ultraviolet-visible and circular dichroism behavior due to exciton coupling in a biscyanine dye

1991 ◽  
Vol 113 (18) ◽  
pp. 7046-7047 ◽  
Author(s):  
Dario Gargiulo ◽  
Fadila Derguini ◽  
Nikolina Berova ◽  
Koji Nakanishi ◽  
Nobuyuki Harada
Keyword(s):  
Circular Dichroism ◽  
Exciton Coupling ◽  
Circular Dichroïsm

Solid-state circular dichroism and hydrogen bonding: Absolute configuration of massarigenin A from Microsphaeropsis sp

Chirality ◽  
2011 ◽  
Vol 23 (8) ◽  
pp. 617-623 ◽  
Author(s):  
Hidayat Hussain ◽  
Ishtiaq Ahmed ◽  
Barbara Schulz ◽  
Siegfried Draeger ◽  
Ulrich Flörke ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Circular Dichroism ◽  
Solid State ◽  
Absolute Configuration ◽  
Circular Dichroïsm

Transmission of Point Chirality to Axial Chirality for Strong Circular Dichroism in Triarylmethylium-o,o-dimers

Synlett ◽  
2018 ◽  
Vol 29 (16) ◽  
pp. 2147-2154 ◽  
Author(s):  
Takanori Suzuki ◽  
Yusuke Ishigaki ◽  
Tomohiro Iwai ◽  
Yuki Hayashi ◽  
Aiichiro Nagaki ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Solvent Effects ◽  
Chiral Auxiliaries ◽  
Response Properties ◽  
Axial Chirality ◽  
Exciton Coupling ◽  
Π Stacking ◽  
Circular Dichroïsm

Triarylmethylium-o,o-dimers adopt a twisted geometry so that two diarylmethyliums are stacked in a slipped manner. Thus, chiral auxiliaries on the aryl groups induce a preference in the axial chirality of the central biphenyl unit. Strong circular dichroism is attained through exciton coupling, which can be used for additional spectral output in their electrochromic behavior. Diastereoselectivity based on π–π stacking exhibits unique solvent effects, thus endowing multifunctional response properties.

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