This study describes the synthesis of 6,7-dihydroxy-4-methyl-2-phenylbenzopyrylium perchlorate halogen derivatives and its spectroscopic and theoretical studies. The compounds were characterized by NMR, XRD, IR-spectroscopy and mass-spectrometry methods. The acid-base properties of obtained compounds were investigated by UV VIS spectrophotometric and tristimulus colorimetric methods. The most probable protonation/deprotonation schemes were theoretically determined for studied unsubstituted and halogen derivatives of 6,7-dihydroxy-4-methyl-2-phenylbenzopyrylium perchlorate using DFT calculations.

中文翻译：

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6,7-二羟基苯甲酸高氯酸卤素衍生物的合成及性能：X射线，光谱和理论研究

这项研究描述了6,7-二羟基-4-甲基-2-苯基苯并吡啶高氯酸卤素衍生物的合成及其光谱和理论研究。通过NMR，XRD，IR光谱和质谱法对化合物进行表征。通过紫外可见分光光度法和三刺激比色法研究了所得化合物的酸碱性质。从理论上确定了最可能的质子化/去质子化方案是使用DFT计算方法确定的，用于研究的6,7-二羟基-4-甲基-2-苯基苯并吡啶高氯酸盐的未取代和卤素衍生物。