Photophysical properties of the trans-dioxotechnetium(V) chromophore are reported for the first time. The complexes [TcO2(L)4] ? (L=pyridine or 4-picoline) and [TcO2(CN)4]³ ? are luminescent from a ³Eg excited state in the near IR with emission maxima ranging from 715-750 nm. DFT calculations predicted the observed red-shift in emission energy relative to trans-dioxorhenium(V) congeners. Distinct vibronic progressions are observed in the symmetric O=Tc=O and Tc-L stretching frequencies in the 8 K emission spectra and excited state lifetimes mirrored trends of the analogous Re(V) complexes.
Revised: May 19, 2011 |
Published: November 2, 2005
Citation
Del Negro A.S., Z. Wang, C.J. Seliskar, W.R. Heineman, B.P. Sullivan, S.E. Hightower, and T.L. Hubler, et al. 2005.Luminescence from the trans-Dioxotechnetium(V) Chromophore.Journal of the American Chemical Society 127, no. 43:14978-14979.PNNL-SA-45787.