Hi, A challenge for you. 10 days are remaining for the ab initio crystal structure determination of the 2 samples below before the SDPD Round Robin deadline : http://fluo.univ-lemans.fr:8001/SDPDRR/ Sample 1 [Co(NH3)5CO3]NO3.H2O (guessing the shape of structure fragments is possible) Crystal system: monoclinic Cell : a = 7.673A, b = 9.628 A, c = 7.077 A, beta = 106.28° Space groups : P21/m or P21 Sample 2 C22H24N2O8.HCl (the molecular formula can be found easily) Crystal system: orthorhombic Cell : a = 10.981 A, b = 12.853 A, c = 15.733 A, Space group : P212121 Best wishes, Armel Le Bail - Laboratoire des Fluorures, CNRS ESA 6010 Universite du Maine, Av. O. Messiaen, 72085 Le Mans cedex 9, France http://fluo.univ-lemans.fr:8001/ http://www.cybercable.tm.fr/~cristal/ chemweb: A list for Chemical Applications of the Internet. To post to list: mailto:chemweb@ic.ac.uk Archived as: http://www.lists.ic.ac.uk/hypermail/chemweb/ To (un)subscribe, mailto:majordomo@ic.ac.uk the following message; (un)subscribe chemweb List coordinator, Henry Rzepa (mailto:rzepa@ic.ac.uk)