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Hello Rongjin Guan, when I enter 'dimer ncs' at www.ixquick.com, there are quite a few hits, some of which could be of interest for you. Why do you think this could be a crystallization artefact? Tim On Wed, Sep 08, 2010 at 12:50:43PM -0400, Rongjin Guan wrote: > Dear All, > > I have a structure with two complexes in the asymmetric unit, and the interactions > on the interface are not the same in the two complexes. Briefly, there are two additional > hydrogen bonds in one complex, but not in the other. This coule be due to crystallization > artefact, but may have other explanations. > > Can anyone direct us to some references where this has been discussed before? > > Thank you very much > > Rongjin Guan -- -- Tim Gruene Institut fuer anorganische Chemie Tammannstr. 4 D-37077 Goettingen GPG Key ID = A46BEE1A