کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5400424 | 1505917 | 2013 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Chain length-dependent piezofluorochromic behavior of 9,10-bis(p-alkoxystyryl)anthracenes
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
In the present work, 9,10-bis(p-alkoxystyryl)anthracenes (DSA-OCn) with various length of alkyl chains (n=1-10, 12, 14, 16, 18) are synthesized and the chain length-dependent piezofluorochromic (PFC) behaviors are systematically investigated. The results show that all the long alkoxy-containing DSA-OCn (nâ¥10) exhibit remarkable grinding-induced spectral shifts (ÎλPFC =46-53 nm) that are significantly larger than those of shorter alkyl chains (nâ¤9, ÎλPFC =14-20 nm). Powder wide angle X-ray diffraction indicates that ground solids are still crystalline but the packing modes have been affected. Differential scanning calorimetric curves indicate that almost all of the DSA-OCn exhibit two exothermic peaks and the lower-temperature peaks are affected by grinding. These findings imply that the existence of a mesophase transition peak and its change upon grinding are not related to the different PFC behaviors. IR spectra show that out-of-plane hydrogen bending modes of the phenyl rings have disappeared in the ground long alkoxy-containing DSA-OCn. This observation implicates a less twisted backbone conformation in the ground than unground states, which is responsible for the dichotomous PFC behavior.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 143, November 2013, Pages 50-55
Journal: Journal of Luminescence - Volume 143, November 2013, Pages 50-55
نویسندگان
Wei Liu, Yalong Wang, Lingyu Bu, Jinfeng Li, Mingxiao Sun, Deteng Zhang, Meng Zheng, Chao Yang, Shanfeng Xue, Wenjun Yang,