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蝶舞天晴木蟲 (著名寫手)
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[求助]
急需各位高手幫助,謝謝啦!有關晶體cif的問題,急!急!急。。
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這是一個審稿人的意見,由于對晶體不是很了解,請大家?guī)臀铱纯吹降资窃趺椿厥拢趺锤,謝謝! In the case of severe disorder or high thermal motion, it is always recommended low temperature measurement. Especially such methods as SQUEEZE, which, in coincidence with SHELXL-97, "massages" the data, should be avoided. So my recommendation is, IF using SQUEEZE, only when low temperature measurement is not available, and in coincidence with better suited refinement software (Crystals, Olex2, SHELXL-2012) thus avoiding "data massaging". My recommendation is low-temperature remeasurement. Also, there are signs of underexposition in all 3 cases, signalised by A alert about Rint value from checkcif (why authors didn't provide checkcif reports?) and extremely low GooF value. In the compound no. 1, there are B level alerts about bad H bonds connectivity, and also formal errors in the CIF. Mistakes, omissions and typos are also in the CIF of compound no. 2. There isn't any mention about using SQUEEZE, which is considered unethical. Please note that original and squeezed structural factors should be both submitted. Generally, I recommend submitting also structural factors to the CSD (see http://journals.iucr.org/e/issues/2010/01/00/me0406/index.html). Problem with H atom placement is also in the compound 3 indicated by B alert (in coincidence with C and G warnings), together with more "formal" alerts of low importance (but all of them could be corrected!). There are again some signs of underexposition and thus too high PSNR value [ Last edited by 蝶舞天晴 on 2013-3-6 at 16:08 ] |

版主 (職業(yè)作家)
隱者
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你沒有給審稿人checkcif的文件,審稿人估計去check了,你結構的R值比較高,goof又不接近1,可能會有A類錯誤,這樣結果是值得商榷的。 可以刪除溶劑分子試一試!這需要你在使用Squeeze 前先將結構解析完全,再用platon ,squeeze,接著精修,精修完成后把產(chǎn)生的sqz文件中的說明復制到cif,再去check cif,這樣也許可以解決這一問題!不過審稿人的建議是對的! [ Last edited by lijunjie84 on 2013-3-6 at 20:21 ] |
版主 (職業(yè)作家)
隱者
至尊木蟲 (職業(yè)作家)

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