Lanthanide-based luminescent hybrid materials.

Nanochemistry: Synthesis in diminishing dimensions

Advanced Zeolite, Materials Science

Two uranyl phenylphosphonates, [UO2(HO3PC6H5)2(H2O)]2·8H2O (1) and UO2(HO3PC6H5)2·2CH3CH2OH (2), have been synthesized and their structures solved by single-crystal methods. Both compounds crystallize in the triclinic space group P1. Unit cell parameters are a = 11.724(4) A, b = 16.676(8) A, c = 11.375(2) A, α = 101.61(5)°, β = 106.76(3)°, γ = 102.57(4)°, and Z = 2 for compound 1 and a = 9.332(6) A, b = 11.48(1) A, c = 5.672(2) A, α = 98.98(6)°, β = 92.78(5)°, γ = 108.54(5)°, and Z = 1 for compound 2. In both compounds the metal to phosphonate ratio is 1:2, and they both form linear chains. Each metal atom in these structures is surrounded by four oxygens of four different phosphonate groups which take up the metal's equatorial positions. However, in compound 1 an additional oxygen of a water molecule binds to the uranium atom in the equatorial plane. This leads to a distorted pentagonal bipyramidal geometry of uranium in compound 1 and to a distorted octahedral geometry of uranium in compound 2. Adjacen...

Synthesis, crystal structures, and proton conductivity of two linear-chain uranyl phenylphosphonates

Tb3+ and Eu3+ were codoped in zeolite-Y Their photoluminescence and photostimulated luminescence were investigated Due to the dissipation of excitation energy by OH vibrations, the luminescence from the hydrated zeolite containing Tb3+ and Eu3+ prepared at room temperature is very weak However, the luminescence is enhanced greatly when the sample was treated at 800 °C Strong photostimulated luminescence of both Tb3+ and Eu3+ was detected in the sample prepared at 800 °C The photostimulated luminescence of Tb3+ is due to the recombination of electrons with Tb4+ ions, while the photostimulated luminescence of Eu3+ is caused by energy transfer from Tb3+ to Eu3+ The existence of Tb4+ and Eu2+ ions is due to charge transfer from Eu3+ to Tb3+ The occurrence of photostimulated luminescence and discrete emission lines in blue (434 nm), green (543 nm), and red (611 nm) colors indicate that this material has potential applications in white light-emitting devices and erasable optical storage

Photoluminescence and photostimulated luminescence of Tb3+ and Eu3+ in zeolite-Y

Laser-induced fluorescence, far-infrared spectroscopy, and luminescence quenching of europium zeolite Y: site-selective probes of extraframework cations

Caracterisation par leurs spectres d'absorption IR et UV-visible et etude des spectres de luminescence de HUO 2 PO 4 •4H 2 O et de ses derives par substitution de H + par NH 4 + , pyridinium, n-butylammonium, n-octylammonium, K + , Ag + , Ca 2+ , Zn 2+ ou Cu 2+ . Durees de vie et declins exponentiels de la luminescence

Excited-State Properties of Lamellar Solids Derived from Hydrogen Uranyl Phosphate

Host-to-guest, excited-state energy transfer in lamellar solids. Photoluminescent properties of hydrated europium uranyl phosphate

Etude de l'absorption optique (350-650 nm) et de la photoluminescence du compose lamellaire H 0,7 [Cr(NM 3 ) 6 ] 0,1 UO 2 PO 4 •6H 2 O obtenu par precipitation a partir d'une solution aqueuse de H 3 PO 4 contenant des ions UO 2 2+ et Cr(NH 3 ) 6 3+ . Observation d'un transfert d'energie de UO 2 2+ au complexe de Cr 3+ avec un rendement voisin de 1. Etude de la photolyse (rayonnement visible) du solide a 295 K: formation de Cr(NM 3 )(H 2 O) 5 3+ et Cr(NM 3 ) 2 (H 2 O) 4 3+ principalement, preuve d'une photosubstitution de coordinat dans le solide

Efficient host-to-guest excited-state energy transfer in a lamellar solid: photoluminescence and photoaquation of hexaamminechromium(III)-substituted hydrogen uranyl phosphate

Hydrogen uranyl phosphate tetrahydrate (HUP) undergoes an essentially complete intercalative ion-exchange reaction with aqueous lanthanon ions to yield a family of hydrated lamellar solids of approximate composition Ln13UO2PO4 (Ln ≡ La, Ce, Pr, Nd, Gd, Tb, Dy and Yb) (LnUP). These compounds have all been characterized by elemental analysis, IR spectroscopy and X-ray powder diffraction; the last technique reveals an expansion of the interlamellar spacing on intercalation. All the solids exhibit visible absorption spectra characteristic of the UO22+ and Ln3+ chromophores. With the exception of the cerium, praseodymium and neodymium derivatives, which are weakly emissive, the LnUP samples emit efficiently at 295 K when excited with blue or near-UV light. Photoluminescence decay curves are exponential and yield lifetimes for the strongly emissive samples of about 90–210 μs; their radiative quantum yields are typically about 0.1–0.2. These data have been used to calculate unimolecular radiative and non-radiative rate constants for excited-state decay as being about (0.8–1) × 103s−1 and (4–10) × 103s−1 respectively.

Excited-state properties of lamellar solids derived from hydrogen uranyl phosphate and lanthanon ions☆

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