Preparation and Characterization of Conducting Trimetallic Nickel-Dithiolene Complexes with Bridging Tetrathiooxalate Ligands

摘要

The development of multimetallic complexes with tto bridging ligands has led to the preparation of novel trimetallic nickel complexes. Our synthesis has yielded crystals of conducting trimetallic complexes. Although the yields of the trimetallic complexes require improvement, it was revealed that the side reaction polymerization can be reduced by mixing the corresponding monometallic complex and tto ligand. These new trimetallic complexes are good candidates for single-component molecular metals: the calculated HOMO—LUMO gap of 2 is very small (0.15 eV), and the HOMO and the LUMO of 2 have a symmetry similar to Ni(tmdt)_2. Electrochemical crystallization or chemical oxidation of the trimetallic complexes, (Et_4N)_2 and (Ph_4P)_2, is now in progress.