The synthesis, characterization, and single crystal X-ray diffraction structures of a series of monoporphyrinate, trivalent lanthanide complexes with the monoanionic ligands hydridotris(1-pyrazolyl)borate (Tp) and (cyclopentadienyl)tris(diethylphosphinito)cobaltate (L(OEt)) having the general formulas M(TPP)(L) (M = Yb, Tm, Er, Ho, Nd, Pr; TPP = 5,10,15,20-tetraphenylporphyrinate; L = Tp, L(OEt)) are described. The photophysical properties of these complexes are also presented including their absorption, emission, and transient absorption properties.
Near-infrared-emitting polymer light-emitting diodes ͑PLEDs͒ have been fabricated using blends of conjugated polymers and lanthanide tetraphenylporphyrin complexes. Host polymers include MEH-PPV and a bis-alkoxy-substituted poly͑p-phenylene͒ ͑PPP-OR11͒, and the lanthanide complexes include Yb͑TPP͒acac and Er͑TPP͒acac ͑where TPPϭ5,10,15,20-tetraphenylporphyrin and acacϭacetylacetonate͒. Electroluminescence ͑EL͒ is observed at 977 nm from devices fabricated using MEH-PPV or PPP-OR11 blended with Yb͑TPP͒acac, and EL is observed at 1560 nm from a device fabricated using a blend of MEH-PPV and Er͑TPP͒acac. Visible EL from the host polymers is strongly suppressed in all of the devices, however, in the device fabricated using the PPP-OR11 polymer blue emission from the host is completely quenched. Very efficient quenching of the EL from the host in the PPP-OR11 device is believed to occur due to efficient Förster energy transfer, which is facilitated by the excellent spectral overlap between the PPP-OR11 fluorescence and the Soret absorption band of the TPP ligand.
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Nanometer-sized aluminum powder was synthesized by thermal decomposition of an alane solution in
the presence of a titanium catalyst under an inert atmosphere. The resulting material, formally devoid of
an oxide layer, was used to reduce complexes of gold, nickel, palladium, and silver. The reduction process
yielded materials that contained the transition metal at a level between 1 and 3 atom % on a metals basis,
as determined by inductively coupled plasma atomic emission spectroscopy and energy dispersive
spectroscopy. After exposure to air at ambient conditions, the transition metal treated aluminum materials
were found to contain less aluminum oxide than an aluminum sample that was not treated with a transition
metal. The nickel treated sample contained as much or more metallic aluminum as the untreated aluminum
sample, indicating that the passivating layer in the nickel treated aluminum was highly efficient at protecting
the underlying aluminum.
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