[交流] 求助：请问H NMR中的large upfield shifts是怎么翻译？是什么意思啊？ 已有2人参与

2楼: Originally posted by hydros at 2018-10-13 06:37:57
给个句子

3楼: Originally posted by 哈哈吉 at 2018-10-13 13:51:01
1H NMR spectra of 6c and 6e show that the signal arising from the phenylene protons H1 shifted upfield from 6.85 for 6c to 6.70 ppm for 6e.
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4楼: Originally posted by hydros at 2018-10-14 07:14:20
Shifted upfield 向高场位移
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5楼: Originally posted by 哈哈吉 at 2018-10-15 14:37:45
请问高场是什么意思呀？为什么会向高场移动呢？
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7楼: Originally posted by hydros at 2018-10-15 15:28:37
一张氢谱，它的左边叫低场区，化学位移大。右边是高场区，化学位移小。位移改变说明结构发生了变化
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8楼: Originally posted by 哈哈吉 at 2018-10-16 12:11:26
请问化学位移是什么意思呀？
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9楼: Originally posted by decoupling at 2018-10-17 12:48:54
化学位移，也就是ppm，是核磁谱的横坐标，是相对值，屋单位。其真实值应该是频率，为方便比较才用ppm作为横轴。化学位移的不同代表该原子核的化学环境（和外电子云）的差异。...