The loss of anions takes place inside the mass spectrometer, generating the multiply charged ions needed for detection and calculation of the molecular weight. ["] Moleculqr mechanics were performed on Go -C3. The square-planar coordination environment of the Pd centers is well preserved. It is clear that after the second generation the structure of the dendrimer becomes quite entangled (Fig. 2). 5 nm Fig 2. Optimircd structures of G,, G ,We have shown that organometallic structures of nanometer dimensions can now be constructed in a very simple and controlled way. This method of controlled assembly provides a new and versatile tool for dendrimer synthesis. The method allows large variation in the metal in each generation, the coordinating ligands, and the structure of the nucleus. Received. December 29, 1995 [Z86901E] German version Arigeii . C/iern.