Spectral Properties of Dyes with Interfragmental Charge Transfer: Solvatochromism and Solvatofluorochromism of 2-(3-Coumaroyl)-benzopyrylium Perchlorates

Table 2

Physicochemical parameters of the CBP salts.

	Colour of crystals	Melting point, °C	Peaks in mass spectra^a,	Elemental analysis^b, %
				C	H
I	Greenish black	291-292	275	78.50 (78.54)	4.11 (4.03)
II	Orange	278	375	76.72 (76.78)	6.21 (6.17)
III	Dark violet	255	375, 850^c	76.54 (76.78)	6.10 (6.17)
IV	Dark red	246	475	75.71 (75.76)	7.35 (7.42)
V	Dark blue	286	346	76.32 (76.28)	5.88 (5.82)
VI	Dark blue	275	346	76.03 (76.28)	5.96 (5.82)
VII	Dark blue	251-252	417	74.84 (74.79)	6.96 (7.00)

Mass spectra were recorded on a Bruker Daltonics MALDI-TOF MS instrument; ^belemental analysis was performed on an Elementar Vario El Cube CHNS analyser; calculated values are given in parentheses; ^ca peak corresponding to the [2(III)·ClO₄]⁺ ion.