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雪花紛芬金蟲 (小有名氣)
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[求助]
CIF文件錯(cuò)誤處理
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晶體解析完,CIF檢查完出現(xiàn)如下錯(cuò)誤,應(yīng)該怎么處理?謝謝各位 Alert level B PLAT230_ALERT_2_B Hirshfeld Test Diff for C3 -- C6 .. 7.6 su PLAT230_ALERT_2_B Hirshfeld Test Diff for C7 -- C8 .. 8.0 su |
禁蟲 (知名作家)
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拋磚,等專家: IUCR的解釋: The components of the anisotropic displacement parameters along chemical bonds are assumed to be equal in magnitude. Large differences might indicate contamination of these parameters with other (unresolved) effects such as (substitutional) disorder, model or data errors and/or over-refinement. Atomic sites assigned the wrong scattering type (e.g. Ag versus Br) should generate 'problem signals' with this test. Data sets corrected for absorption effects with DELREF techniques (e.g. DIFABS, SHELXA, XABS2) often show large DELU values for bonds involving the heaviest atom. Note: The original 'Hirshfeld-test' was defined in absolute terms (see F.L.Hirshfeld, Acta Cryst. (1976). A32, 239-244). The current test is with reference to the associated standard uncertainty. |
金蟲 (著名寫手)
木蟲 (小有名氣)
金蟲 (小有名氣)
禁蟲 (知名作家)
金蟲 (小有名氣)
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