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看债券的电子密度差Lecture 6 - Seeing Bonds by Electron Difference Density |
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| 课程网址: | http://videolectures.net/yalechem125f08_mcbride_lec06/ |
| 主讲教师: | J. Michael McBride |
| 开课单位: | 耶鲁大学 |
| 开课时间: | 2010-06-09 |
| 课程语种: | 英语 |
| 中文简介: |  |
| 课程简介: | Professor McBride uses a hexagonal "benzene" pattern and Franklin's X-ray pattern of DNA, to continue his discussion of X-ray crystallography by explaining how a diffraction pattern in "reciprocal space" relates to the distribution of electrons in molecules and to the repetition of molecules in a crystal lattice. He then uses electron difference density mapping to reveal bonds, and unshared electron pairs, and their shape, and to show that they are only one-twentieth as dense as would be expected for Lewis shared pairs. Anomalous difference density in the carbon-fluorine bond raises the course's second great question, "Compared to what?" Problem sets/Reading assignment: Reading assignments, problem sets, PowerPoint presentations, and other resources for this lecture can be accessed from Professor McBride's on-campus course website, which was developed for his Fall 2008 students. |
| 关 键 词: | X-射线晶体学; 电子密度差; 刘易斯共享对 |
| 课程来源: | 视频讲座网 |
| 最后编审: | 2021-12-27：liyy |
| 阅读次数: | 68 |