| Autor: |
Taylor SD; Department of Chemistry , University of Cincinnati , P.O. Box 210172, Cincinnati , Ohio 45221-0172 , United States., Shingade VM; Department of Chemistry , University of Cincinnati , P.O. Box 210172, Cincinnati , Ohio 45221-0172 , United States., Muvirimi R; Department of Chemistry , University of Cincinnati , P.O. Box 210172, Cincinnati , Ohio 45221-0172 , United States., Hicks SD; Department of Chemistry , University of Cincinnati , P.O. Box 210172, Cincinnati , Ohio 45221-0172 , United States., Krause JA; Department of Chemistry , University of Cincinnati , P.O. Box 210172, Cincinnati , Ohio 45221-0172 , United States., Connick WB; Department of Chemistry , University of Cincinnati , P.O. Box 210172, Cincinnati , Ohio 45221-0172 , United States. |
| Abstrakt: |
Pt(tpy)X 3 + [X = Cl ( 1 ), Br ( 2 ); tpy = 2,2':6',2″-terpyridine] salts were prepared by the oxidative addition of Pt(tpy)X + with X 2 as originally reported by Morgan and Burstall in 1934. The complexes have been fully characterized by 1 H NMR spectroscopy, elemental analysis, mass spectrometry, and X-ray crystallography. The electronic structures of 1 and 2 were investigated using absorption and emission spectroscopy, and the accumulated data are consistent with stabilization of the singlet ligand-centered and potentially singlet ligand field/singlet ligand-to-metal charge-transfer states for 1 and 2 compared to those for Pt(tpy)Cl + ( 3 ) and Pt(tpy)Br + ( 4 ). The changes in the lowest-energy-absorbing state result in drastic differences in the emission behavior among 1 - 4 . Specifically, 1 emits from a lowest-energy state that appears to have triplet ligand field/triplet ligand-to-metal charge-transfer character, whereas 2 exhibits no appreciable emission between 400 and 800 nm. |
