Helvetica Chimica Acta p. 1264 - 1283 (1980)
Update date:2022-07-30
Topics:
Gunzenhauser, Sigmund
Balli, Heinz
Substituted 6,6-diphenyl-6H-chromeno<4,3-b>indoles are forming with acid ring-opened, intensely coloured diphenyl-indol-3-yl-carbenium salts.The preparation of these products is described and the UV/VIS.-spectra are discussed.An investigation of the halochromic properties is made by spetrophotometric determination of εpH*- and εHo*-curves in buffered methanol/water solutions. pK*- and pK0*-values respectively are calculated and suitability of substituted 6H-chromeno<4,3-b>indoles as chromogens in self-duplicating stationary is discussed.
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