Abstract The acetophenone 2-hydroxy-3,4,6-trimethoxyacetophene (C11O5H14, hereafter named as HTMCX) was obtained from the stem bark of Croton anisodontus Mull.Arg., an endemic species found in the caatinga of Northeast Brazil. The HTMCX crystal was investigated via Raman spectroscopy as a function of the temperature and pressure, in the intervals ranging from 300 to 8 K and from ambient pressure up to 9.7 GPa, respectively. In low-temperature experiments, we observed changes in the slope of the wavenumber versus temperature curves in the spectral range of 30–350 cm−1 at ∼ 210 K, as well as discontinuities in the wavenumber of modes in the region for wavenumbers higher than 1300 cm−1. These modifications are compatible with a conformational change occurring at around 210 K. Regarding the high-pressure experiments, we found that the wavenumber for modes located in the low-wavenumber region (ω

中文翻译：

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2-羟基-3,4,6-三甲氧基苯乙酮的低温高压拉曼光谱从巴豆属Müll.Arg中分离

摘要 苯乙酮2-羟基-3,4,6-三甲氧基苯乙酮（C11O5H14，以下简称HTMCX）是从巴西东北部卡廷加特有种巴豆（Croton anisodontus Mull.Arg.）的茎皮中提取的。HTMCX 晶体通过拉曼光谱作为温度和压力的函数进行研究，区间分别为 300 至 8 K 和环境压力至 9.7 GPa。在低温实验中，我们观察到 30–350 cm−1 光谱范围内波数与温度曲线的斜率在 ~ 210 K 处发生变化，以及波数高于1300 厘米-1。这些修饰与在 210 K 左右发生的构象变化相容。关于高压实验，