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The research I've been doing lately has been in the lab of Dr. H. Lang. Herr Doktor Lang has done much work with complexes which contain a titanocene fragment (Cp2Ti) joined to a late transition fragment (AgCl, CuBr, NiCO, PdPPh3, &c.) by two bridging acetylide ligands. One of my initial ideas was to extend this chemistry by using other "less late" transition metals, such as molybdenum, iron, or what-have-you. A bit of iron chemistry had already been done (and shown to be more trouble than it was worth) and the chromium triad had been well-researched by another post-doc (who did some good stuff with tungsten and molybdenum). I tried rhenium for a while, but had no success. Same with manganese.
So, giving up on that, I tried replacing the titanocene fragment. Hafnocene and zirconocene had been done, so I thought of trying a vanadium centre. CpV(acac) and CpV(dppe) dichlorides turned out to be horribly air-sensitive, so that wasn't worth working on. Vanadocene dichloride is quite air-stable, but the bis(acetylide) is not. So, to heck with vanadium.
Cp2W(CCTMS)2 appeared promising for a while, but it rapidly decomposed whenever I tried reacting something with it. In retrospect, a substituted Cp ring would probably have worked better.
Right now, I'm attempting to make complexes containing the "chrophylacetylide" ligand, which is a phenylacetylide ligand with a Cr(CO)3 moiety coordinated to the phenyl group. This is so that we can test them for metal-metal communication (yeah, I'm back to electrochemistry).