No abstract

A near trigonal antiprism with metal-metal distances in the nanometer regime is formed by the six metal ions in the crystalline, homochiral [Ga(6)(L(2))(6)] (see structure). This metal-ligand "cylinder" is based on a threefold symmetric, beta-diketone ligand, and represents a new geometry for metal-ligand clusters.

In order to achieve a better understanding of how scanning tunneling microscopy (STM) images of metallo-complexes are related to the geometric and electronic structure, we performed scanning microscopy (STM) and scanning tunneling spectroscopy (STS) techniques on [Fe III Fe III 3L6] (L= N-methylaminediethanolate) star-type tetranuclear molecular magnet. The experiments were performed under ambient condition. We were able to image single molecule by STM with submolecular resolution. In our STS measurements we found a rather large signal at the positions of iron ion centers in the molecules. This direct addressing of metal centers was further confirmed by density functional theory (DFT) calculations.