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¼±Ðè¸÷λ¸ßÊÖ°ïÖú£¬Ð»Ð»À²£¡Óйؾ§ÌåcifµÄÎÊÌ⣬¼±£¡¼±£¡¼±£¡£¡£¡
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ÕâÊÇÒ»¸öÉó¸åÈ˵ÄÒâ¼û£¬ÓÉÓÚ¶Ô¾§Ìå²»ÊǺÜÁ˽⣬Çë´ó¼Ò°ïÎÒ¿´¿´µ½µ×ÊÇÔõô»ØÊ£¬ÒªÔõô¸Ä£¬Ð»Ð»£¡ 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 µûÎèÌìÇç on 2013-3-6 at 16:08 ] |
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