azobenzene-substituted zinc phthalocyanine (azo-ZnPc dyad) were studied by UV/vis, fluorescence, and (1)H NMR spectroscopy. Upon illumination with 365 nm UV light, the trans-cis isomerization of azobenzene can efficiently reduce the steric hindrance around the peripheral oxygen atom of azo-ZnPc, shortening the possible distance between two phthalocyanine molecules and, consequently, greatly improving
通过紫外/可见光,荧光和(1)H NMR光谱研究了新型
偶氮苯取代的
锌酞菁锌(偶氮-ZnPc二聚体)的光响应J聚集行为。在365 nm紫外光照射下,
偶氮苯的反式-顺式异构化可以有效地降低偶氮-ZnPc外围氧原子周围的空间位阻,从而缩短了两个
酞菁分子之间的可能距离,从而大大改善了J-偶氮-ZnPc二聚体的聚集。通过Z扫描技术在532 nm下以25 ps的脉冲持续时间测量光响应性J聚集体的三阶光学非线性(照射前后)。Z扫描光谱表明,所有样品都具有较大的正非线性折射和正非线性吸收,分别表现出自聚焦效应和反向饱和吸收。在两个条件下,二元组的第二分子超极化率分别为3.87 x 10(-30)和4.82 x 10(-30)esu。所有结果表明,偶氮-ZnPc二聚体在非线性光学应用领域具有潜力。