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Pyridine, a strong organic base, reacts easily with many acids to form an interesting family of pyridinium compounds. In solid salts the symmetrical, planar,heteroaromatic pyridinium cation is involved in interionic hydrogen bonds. Some pyridinium salts undergo solid-solid phase transitions at low temperatures, changing the cation dynamics. The pyridinium cation, held rigidly in the crystal lattice well below the phase transition, reveals orientational disorder at room temperature. Previous NMR studies have disclosed the dynamic character of this disorder as in-plane 60' reorientational jumps of the cation about its pseudohexad axis. |
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邓新云: 金币+2, 翻译EPI+1, ★有帮助 2014-04-29 21:34:49
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邓新云: 金币+2, 翻译EPI+1, ★有帮助 2014-04-29 21:34:49
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第一句: 1.吡啶 pyridine https://www.google.com/search?q=Pyridine 2.有机碱 organic base https://www.google.com/search?q=organic+base 3.吡啶鎓化合物 pyridinium compounds 5.png 55.jpg 555.png 5555.png 55555.png 555555.png 5555555.png 55555555.png 555555555.png 5555555555.png 51.png |
2楼2014-04-29 19:53:48
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邓新云: 金币+2, ★有帮助 2014-04-29 21:34:59
邓新云: 金币+2, ★有帮助 2014-04-29 21:34:59
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4楼2014-04-29 20:35:15
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邓新云: 金币+2, ★有帮助 2014-04-29 21:35:08
邓新云: 金币+2, ★有帮助 2014-04-29 21:35:08
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