562809-74-9Relevant academic research and scientific papers
Luminescent η5-pentamethylcyclopentadienyl tantalum(V) complexes: Synthesis, characterization, and emission spectroscopy
Tonzetich, Zachary J.,Eisenberg, Richard
, p. 340 - 344 (2003)
A series of η5-pentamethylcyclopentadienyl tantalum(V) complexes have been prepared and their electronic and emission spectra examined. Compounds of the form Cp*TaX4 (where X=Cl, Br, OC6F5) and Cp*TaCl2X2 (where X=OC6Cl5, 2,6-OC6H3Cl2), as well as CpTaX4, have been found to luminesce at 77 K in frozen glasses (only Cp*TaCl4, reported previously, luminesces at ambient temperature in both solid and fluid solution). The shifts in luminescence maxima with ligand variation lead to the conclusion that the emissive state is a ligand-to-metal charge transfer in which the highest occupied orbital is based on the donor atom of one of the monodentate ligands and the lowest unoccupied orbital is Ta-based.
