Photophysical Properties of Noncanonical Amino Acid 7-Fluorotryptophan Sharply Different from Those of Canonical Derivative Tryptophan: Spectroscopic and Quantum Chemical Calculations

2021 ◽  
Author(s):  
Tonima Nandy ◽  
Prashant Chandra Singh
Keyword(s):  
Amino Acid ◽  
Quantum Chemical Calculations ◽  
Quantum Chemical ◽  
Photophysical Properties ◽  
Noncanonical Amino Acid

scholarly journals On the Chromophore of the Ninhydrin-Amino Acid Color Reaction

1993 ◽  
Vol 48 (8) ◽  
pp. 1133-1137 ◽  
Author(s):  
F. Dietz ◽  
K. Rommel-Möhle ◽  
A. Schleitzer ◽  
N. Tyutyulkov
Keyword(s):  
Amino Acid ◽  
Quantum Chemical Calculations ◽  
Quantum Chemical ◽  
Color Reaction ◽  
Long Wavelength ◽  
Aromatic Character ◽  
Wavelength Absorption ◽  
Ruhemann’S Purple ◽  
Acid Color

The long-wavelength absorption of the dye formed at the ninhydrin-amino acid color reaction is caused by the anion (enolate) of diketohydrindamine-diketohydrindylidene (Ruhemann’s purple). Using the results of quantum-chemical calculations (MNDO, PPP) the basic chromophoric system was identified as two coupled five-membered rings which have partial anti-aromatic character like the antiaromatic cyclopentadienyl cation.

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