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[求助]
配位水上的氫是關于鏡面對稱的，看了審稿意見仍然加不好，求助各位蟲友，成分感激 已有3人參與
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以下是審稿意見： 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. |
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4樓2017-08-19 09:39:44
leaves922
木蟲 (正式寫手)
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【答案】應助回帖
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感謝參與，應助指數(shù) +1
shiandtian: 金幣+2 2017-08-18 19:33:46
感謝參與，應助指數(shù) +1
shiandtian: 金幣+2 2017-08-18 19:33:46
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把水分子放進part -1試試，占據(jù)數(shù)10.5 發(fā)自小木蟲IOS客戶端 |
2樓2017-08-18 17:36:02
3樓2017-08-18 19:13:07
leaves922
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非特殊位置的更改一部分H的指向，特殊位置的水分子無序要做part-1，如果特殊位置都在part-1有鍵連，要單獨拿出來做part-2，而且特殊位置的占據(jù)數(shù)都是0.5 發(fā)自小木蟲IOS客戶端 |
5樓2017-08-19 09:59:01
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