کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1407355 | 1501903 | 2007 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Structure and guest dynamics for calix[4]arene derivative inclusion compounds
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Structure and guest dynamics of the p-t-butylcalix[4]arene derivative including aromatic molecule (benzene and pyridine) were studied by means of single-crystal XRD and solid state NMR. The single-crystal XRD studies on these compounds at 130Â K show a guest molecule in the host cavity. Pyridine inclusion compound, however, contains another pyridine molecule outside the cavity. Both guests in the cavity show quite similar orientations except their dynamics. Variable temperature 2H NMR spectra on the benzene compound suggest an in-plane rotation of the benzene about C6 axis even at 80Â K. On the other hand, the pyridine in the cavity remains static at least up to 240Â K pointing its nitrogen atom outside the cavity, although outside one undergoes rapid in-plane oscillation. The guest dynamics are restricted by the two aromatic rings of the host except benzene C6 reorientation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Structure - Volume 833, Issues 1â3, 15 May 2007, Pages 108-113
Journal: Journal of Molecular Structure - Volume 833, Issues 1â3, 15 May 2007, Pages 108-113
نویسندگان
Takamoto Kawaguchi, Hiroshi Ohki, Koji Yamada, Tsutomu Okuda, Takeharu Haino, Yoshimasa Fukazawa,