Polymorphisms of 4,5-Bis(4-Methoxyphenyl)-2-(3-Nitrophenyl)-1H-Imidazole as Studied by Solid State NMR |
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| Authors: | Takeshi Yamanobe Tadashi Komoto Yoshiko Sakaino |
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| Institution: | 1. Department of Chemistry , Faculty of Engineering, Gunma University , Kiryu, Gunma , 376 , Japan;2. Department of Chemistry , Faculty of Education, Gunma University , Maebashi, Gunma , 371 , Japan |
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| Abstract: | Abstract Solid state NMR measurements are carried out for polymorphs and inclusion complexes of 4,5-bis(4-methoxyphenyl)-2-(3-nitrophenyl)-1H-imidazole. Observed 13C and 15N chemical shifts are characteristic of each polymorph A, B, C and D. In addition, 15N chemical shift was a good index for understanding hydrogen bond. VT measurements revealed that B transforms to C between 93 and 113°C. From PSTMAS and 1H solid echo measurements for AcOET inclusion complex, host molecules have almost same structure as B and guest molecules have the highest mobility of all inclusion complexes. |
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