The processes occurring during photobleaching of a new nonlinear optical co-crystal 2,6-diaminopyridine-4-nitrophenol-4 nitrophenolate are investigated. Using infrared spectroscopy of co-crystals, destruction of an aminopyridine-nitrophenol molecular complex by photoactinic radiation without breakage of aminopyridine and nitrophenol molecules integrity is shown. Differential scanning calorimetry and thermogravimetric analysis of the co-crystals showed a decrease in temperature of transitions of exposed co-crystals due to structural changes. Intensities of the second harmonic of the co-crystals under study were measured before and after photoactinic exposure; the results showed the decrease in the intensities of the second harmonic during prolonged illumination due to the structural changes in volume of the co-crystals confirming the breakage of the aminopyridine-nitrophenol molecular complex with preservance of the integrity of the molecules forming the molecular complex. Method...

中文翻译：

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非线性有机共晶体2,6-二氨基吡啶-4-硝基苯酚-4-硝基苯酚盐的光漂白

研究了新的非线性光学共晶体2,6-二氨基吡啶-4-硝基酚-4硝基酚盐的光漂白过程中发生的过程。使用共晶体的红外光谱，显示了通过光化学辐射对氨基吡啶-硝基苯酚分子复合物的破坏，而没有破坏氨基吡啶和硝基苯酚分子的完整性。共晶体的差示扫描量热法和热重分析表明，由于结构变化，暴露的共晶体的转变温度降低。在光化性曝光之前和之后，测量所研究的共晶体的二次谐波强度。结果表明，由于共晶体体积的结构变化，长时间照明期间二次谐波的强度降低，这证实了氨基吡啶-硝基苯酚分子配合物的破坏，同时保留了形成分子配合物的分子的完整性。方法...