Hi guys, I am preparing a movie in which I want an organometallic compound linked to an organic one to rotate around the bound between both moieties. Do to so, I need the whole first coordination sphere of the metal and the metal itself to behave as a unique block. If I generate bonds with chimera (covalent) I can do that. Unfortunately, if I keep the session and open back, the bonds have been changed by pseudo bonds (which is actually A LOT BETTER!) but pseudo bonds does not allow the first coordination sphere to behave as a block. I wonder what is the best to solve this problem? Can atoms related by pseudobonds be set (even from the python shell) to be rigid? All the best, JD Dr. Jean-Didier Maréchal Associate Professor The Computational Biotechnological Chemistry Team Unitat de Química Física Departament de Química Universitat Autònoma de Barcelona Edifici C.n. 08193 Cerdanyola (Barcelona) Tel: +34.935814936 e-mail: JeanDidier.Marechal@uab.es www: http://asklipio.qf.uab.es