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zhaoqhjy

铜虫 (初入文坛)

[求助] 高斯软件计算出的电子密度。。。正负号代表什么? 已有1人参与

没有学过高斯软件,让别人给做了个噻虫嗪分子的计算,得到的电子密度整理后如下:
Label        Atom        Charge density        Label        Atom        Charge density
1        C        -0.26        9        N        0.22
2        N        -0.2        10        C        0.14
3        C        0.2        11        C        -0.32
4        O        0.41        12        S        0.47
5        C        0.32        13        C        -0.32
6        N        -0.6        14        Cl        0.16
7        C        0.66        15        N        -0.29
8        N        -0.2        16        C        0.08
想知道每个原子中电子密度的意义?是正数越大(如7号C),代表的电子密度越大?还是负数越小(如6号N),代表的电子密度越大?
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archbishop

禁虫 (职业作家)

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正电荷和负电荷。
雲幕低垂映桂子,江月留白問柳心。
2楼2015-05-17 14:22:31
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xujisheng

铁杆木虫 (著名写手)

【答案】应助回帖

首先,这不是电子密度,电子密度是eletron density,这个是charge density,详见下面的文章:

The charge is the electron density difference between atomic state and molecular state of S atom. The results show that only the S atom in ETL is negatively charged. It means that the ethyl group donates its electrons to S atom in ETL. Moreover, other sulfur compounds show that S atom donates its electrons to other groups, especially the phenyl group, which leads to a positively charge on S atom.

---Li H, Zhu W, Zhu S, et al. The selectivity for sulfur removal from oils: an insight from conceptual density functional theory[J]. AIChE Journal, 2016, 62(6): 2087-2100.
3楼2021-03-20 21:03:46
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xujisheng

铁杆木虫 (著名写手)

【答案】应助回帖

首先,这不是电子密度,电子密度是electron density,这个是charge density,详见下面的文章:

The charge is the electron density difference between atomic state and molecular state of S atom. The results show that only the S atom in ETL is negatively charged. It means that the ethyl group donates its electrons to S atom in ETL. Moreover, other sulfur compounds show that S atom donates its electrons to other groups, especially the phenyl group, which leads to a positively charge on S atom.

---Li H, Zhu W, Zhu S, et al. The selectivity for sulfur removal from oils: an insight from conceptual density functional theory[J]. AIChE Journal, 2016, 62(6): 2087-2100.
4楼2021-03-20 21:04:37
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