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agou8888新蟲(chóng) (小有名氣)
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【求助】關(guān)于A級(jí)警告:PLAT601_ALERT_2_A Structure Contains Solvent Accessible VOI 已有4人參與
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有個(gè)晶體platon檢查出現(xiàn)A級(jí)別警告: PLAT601_ALERT_2_A Structure Contains Solvent Accessible VOIDS of . 250.00 A**3 可確定無(wú)殘余未指認(rèn)溶劑分子。記得以前看過(guò)一篇文獻(xiàn)對(duì)這個(gè)A級(jí)警告解釋為:結(jié)晶過(guò)程中溶劑分子失去,但是這句話具體怎么說(shuō)不記得了,忘xdjm知道的告訴我。 |
木蟲(chóng) (正式寫(xiě)手)
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原話是這么說(shuō)的: Crystal structures in general do not contain large solvent accessible voids in the lattice. Most structures loose their long-range ordening when solvent molecules leave the crystal. Only when the remaining network is strongly bonded (e.g. zeolites and some hydrogen bonded networks) the crystal structure may survive. Residual voids in a structure may indicate the omission of (disordered) density from the model. Disordered density may go undetected when smeared since peak search programs are not designed to locate maxima on density ridges. The presence or absence of residual density in the void may be veryfied on a printed/plotted difference Fourier map or with PLATON/SQUEEZE. Voids of 40 Ang**3 may accommodate H2O. Small molecules such as Tetrahydro Furane have typical volumes in the 100 to 200 Ang**3 range. 見(jiàn): http://www.chem.gla.ac.uk/~louis/software/wingx//hlp/cif117.htm 打開(kāi)后拉到最下面. |
新蟲(chóng) (初入文壇)
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