ISSN:
0018-019X
Keywords:
Chemistry
;
Organic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Halochromic Molecules. Chromogenic Compounds by Cyclization of [2-(Benzothiazol-2-yl)amino-4-(diethylamino)phenyl]heteroarylium Salts: Synthesis and Acidobasic BehaviourColoured [2-(Benzothiazol-2-yl)amino-4-(diethylamino)phenyl]heteroarylium salts are deprotonated to colourless spiro-compounds. The preparation of these products is described and their structure is explained by 1H-NMR and UV/VIS spectroscopy. An investigation of the halochromic properties is carried out by spectro-photometric determination of εpH*- and εH0*-curves in buffered MeOH/H2O solutions. pK*-Values are determined, and the complex protonation equilibria are discussed. One of the heteroarylium salts does not form a spiro-compound by deprotonation, but it is stabilized by a σ-bond resonance.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/hlca.19830660728
