单冠醚取代不对称酞菁LB膜的制备和表征

酞菁化合物有序聚集体已成为材料化学中的研究热点［１，２］，在酞菁分子中引入冠醚会大大改善酞菁化合物的气敏性，在提高响应速度和重复性的同时，其响应温度可降到室温［３，４］．研究冠醚酞菁气敏性质的通常方法是将其制成浇铸膜［４］，这种膜是无序的．膜中分子的...

The Deposition and Characterization of Langmuir-Blogett Films of Mono-crown Ether Substituted Unsymmetrical Phthalocyanines

The mono-layers and Langmuir-Blogget films forming properties of three novel unsymmetrical phthalocyanines bearing one crown ether ring and three alkoxyl chains have been studied. Inspection of the π-A isotherms indicates that they form stable and well distributed mono-layers on water subphase. The mono-layers can be transferred to CaF₂ substrates. UV-Vis spectroscopic studies show that the absorbance varies linearly with the number of layers. Compounds a and b gave rise to Ytype deposition while compound c deposited in Ytype over the first few dipping cycles with subsequent Z-type deposition on the following cycles. The molecular packing of the films has been probed by polarized UV-Vis spectroscopy and low-angle X-ray diffraction methods. The results show that the phthalocyanine macrorings of compounds a, b and c inclined to the substrates' surface with an angle of 39°, 57° and 47°, respectively. The thickness of the corresponding films was estimated to be 1.9, 2.2 and 2.9 nm, respectively.