| 查看: 1270 | 回复: 12 | ||||
[求助]
配位水上的氢是关于镜面对称的,看了审稿意见仍然加不好,求助各位虫友,成分感激 已有3人参与
|
||||
|
以下是审稿意见: Hydrogens of the coordinated water molecules O(1W) and O(2W). Refining hydrogens in close proximity to a heavy atom, especially on room-temperature data, is seldom successful, especially as both O lie on a mirror plane, so in the suggested models each H is disordered between two positions. Thus, some O-H bonds are almost pointing towards the lanthanide atom, with unrealistically short H...Ln contacts of 2.10-2.35 Ang (in one case in 4, as short as 1.76 Ang). Then, these hydrogens do not make a sensible network of hydrogen bonds, which is improbable when there are plenty of acceptors (O) nearby. My suggestions are shown in the attached file 7.res. Here, O(2W) has its hydrogens related by the mirror plane, hence only one independent H with occupancy of 1. It forms a hydrogen bond with O(3W). Thus there is no hydrogen directed towards the metal. At O(1W), one H atom lies on the mirror plane (like the O itself) and forms H-bond with O(2W)(2-x, y, -z), related by twofold axis. The other H is disordered between two positions related by the mirror plane, and interacts with O(4A)(2-x,1-y,1-z). Note that the latter atom has occupancy of 0.5, which agrees well with the half-occupancy of the H. In this file, O(5W), O(6W) and O(7W) have increased occupancies, better fitting the electron density, so now there is 1.75 H2O per asymmetric unit, or 3.5 per formula unit, and the formula should be _chemical_formula_moiety ‘C23 H19 Er O10, 3.5(H2 O) ' _chemical_formula_sum 'C23 H26 Er O13.5' _chemical_formula_weight 686.35 _exptl_absorpt_coefficient_mu 3.798 _exptl_crystal_density_diffrn 1.724 Structures 4 and 5 can be treated similarly. |
» 本帖附件资源列表
-
欢迎监督和反馈:小木虫仅提供交流平台,不对该内容负责。
本内容由用户自主发布,如果其内容涉及到知识产权问题,其责任在于用户本人,如对版权有异议,请联系邮箱:xiaomuchong@tal.com - 附件 1 : 4.cif
- 附件 2 : 5.cif
- 附件 3 : 7.cif
2017-08-18 17:26:17, 314.94 K
2017-08-18 17:26:18, 268.73 K
2017-08-18 17:26:18, 245.85 K
» 猜你喜欢
中南大学易小艺课题组诚招2026申请-考核制博士生
已经有0人回复
海南师范大学招收化学博士(光电功能材料课题组招收博士研究生)
已经有10人回复
无机化学论文润色/翻译怎么收费?
已经有103人回复
求助几个团簇的cif
已经有0人回复
急求该反应的详细机理
已经有4人回复
我想更懂你29
专家顾问 (文坛精英)
-

专家经验: +1066 - 应助: 2668 (讲师)
- 贵宾: 0.483
- 金币: 86650.9
- 散金: 87
- 红花: 449
- 帖子: 11159
- 在线: 7862.4小时
- 虫号: 2622604
- 注册: 2013-08-29
- 性别: GG
- 专业: 原子簇化学
- 管辖: 无机/物化
【答案】应助回帖
★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ...
感谢参与,应助指数 +1
shiandtian: 金币+96, 10 2017-08-21 20:31:45
感谢参与,应助指数 +1
shiandtian: 金币+96, 10 2017-08-21 20:31:45
| 审稿人说的很清楚了,O(2W)上只有一个独立的氢,与O(2W)有氢键作用,占有率是1,另一个可以对称操作得到;O(1W)上有两个氢,其中一个的占有率是1,与O(2W)有氢键作用,另一个氢的占有率为0.5,与O(4A)有氢键作用,所以当你grow之后,会出现三个氢原子是对的,其中一个的占有率是1,另两个的占有率是0.5,这样的话还是两个氢原子,根本原因在于O(1W)上两个氢原子,一个位于特殊位置,另一个位于一般位置 |

13楼2017-08-21 14:35:07
leaves922
木虫 (正式写手)
- 应助: 115 (高中生)
- 金币: 2783.7
- 红花: 18
- 帖子: 418
- 在线: 32.5小时
- 虫号: 4451315
- 注册: 2016-03-01
- 性别: MM
- 专业: 分析化学
2楼2017-08-18 17:36:02
3楼2017-08-18 19:13:07
4楼2017-08-19 09:39:44
leaves922
木虫 (正式写手)
- 应助: 115 (高中生)
- 金币: 2783.7
- 红花: 18
- 帖子: 418
- 在线: 32.5小时
- 虫号: 4451315
- 注册: 2016-03-01
- 性别: MM
- 专业: 分析化学
|
非特殊位置的更改一部分H的指向,特殊位置的水分子无序要做part-1,如果特殊位置都在part-1有键连,要单独拿出来做part-2,而且特殊位置的占据数都是0.5 发自小木虫IOS客户端 |
5楼2017-08-19 09:59:01
匿名
用户注销 (知名作家)
精修问题可私信
- CMEI: 2
- 应助: 2712 (讲师)
- 贵宾: 0.836
- 金币: 38467.5
- 散金: 1801
- 红花: 400
- 帖子: 5825
- 在线: 1932.4小时
- 虫号: 0
- 注册: 2008-10-05
- 性别: GG
- 专业: 药物分析
- 管辖: 晶体
6楼2017-08-19 12:26:11
7楼2017-08-19 16:01:14
8楼2017-08-19 16:02:47
leaves922
木虫 (正式写手)
- 应助: 115 (高中生)
- 金币: 2783.7
- 红花: 18
- 帖子: 418
- 在线: 32.5小时
- 虫号: 4451315
- 注册: 2016-03-01
- 性别: MM
- 专业: 分析化学
9楼2017-08-19 16:19:25
xwnail2003
禁虫 (著名写手)
|
本帖内容被屏蔽 |
10楼2017-08-19 16:41:20












回复此楼

shiandtian