Thermosolvatochromism of two dyes generated from hydroxyphenyl and hydroxynaphthyl derivatives of 7H-indolo[1,2-a]quinolinium salts was studied in 14 pure solvents with polarities ranging from 155.3 to 249.5 kJ·mol^-1 according to E_T(30) polarity scale. The measurements were carried out at temperatures ranging from -5 °C to 80 °C. The UV-Vis spectra of both compounds were found to be sensitive to temperature changes. In polar solvents, a decrease in temperature caused a hypsochromic shift in the UV-Vis spectrum of the studied dyes. In less polar solvents, a hypsochromic shift in the UV-Vis spectra of hydroxynaphthyl derivative with decreasing temperature was still observed, but in the spectrum of hydroxyphenyl derivative, a bathochromic shift was recorded. The results were compared with the spectral properties of Reichardt’s dye. The influence of temperature on the absorption band position of hydroxynaphthyl derivative in many solvents was even greater than that of Reichardt’s dye. The strength of solute-solvent interaction, as well as solvatochromic sensitivity and the type of solvatochromism (positive or negative), which the studied dyes exhibited, were taken into account in order to explain the obtained results. The VBHB model appeared to be very useful for interpretation of thermosolvatochromic properties of the studied dyes.

根据E _T（30），在极性为155.3至249.5 kJ·mol ^-1的14种纯溶剂中研究了7H-吲哚并[1,2-a]喹啉鎓盐的羟苯基和羟萘基衍生物生成的两种染料的热溶剂致变色。极性标度。测量在-5°C至80°C的温度范围内进行。发现两种化合物的UV-Vis光谱对温度变化敏感。在极性溶剂中，温度降低导致所研究染料的UV-Vis光谱发生七色移。在极性较小的溶剂中，仍观察到羟基萘基衍生物的UV-Vis光谱随温度降低而出现的变色位移，但在羟基苯基衍生物的光谱中，记录了红移现象。将结果与Reichardt染料的光谱性质进行比较。温度对羟基萘衍生物在许多溶剂中的吸收带位置的影响甚至大于雷卡德染料。溶质与溶剂相互作用的强度，为了解释所获得的结果，还考虑了所研究的染料表现出的溶剂变色敏感性和溶剂变色的类型（正或负）。的VBHB模型似乎对解释所研究染料的热溶剂变色性质非常有用。