(US4891075-A)      Wavelength shifting device comprises the reaction prod. of a beta diketone bearing reagent and a lanthamide metal ion. The reaction prod. chelates the lanthamide metal ion into a transparent matrix so that the obtd. wavelength shifting device can be optically coupled to a photovoltaic cell.    The wavelength shifting device is pref. formed as a transparent (co)polymer. The reaction prod. is dispersed in a transparent plastic and is a stable 1:1 lanthamide ion chelate fluorophore.    USE/ADVANTAGE -   When coupled to a photovoltaic cell, the portion of the solar spectrum available to the cell for conversion into electricity is increased.    (US4968631-A)      The amt. of amine in a sample is detected by contacting a sample with a lanthanide metal ion, a beta-diketone and an aldehyde so the beta-diketone and the aldehyde react with any amine present in the sample to produce a dihydrophyridine condensn. reaction prod. which then chelates the lanthanide metal ion, and measuring long-lived fluorescence of any chelated metal ion to determine the amt. of amine present in the sample. Pref. the fluorescence is measured with a fluorometer.    ADVANTAGE -   Amines in a sample can be accurately detected. @(10pp)    (JP9101262-A)      A wavelength-shifting device useful when optically coupled to a photoelectric cell to increase the portion of the solar spectrum available to the cell for conversion into electricity comprises the reaction prod. of a beta-diketone (I), an aldehyde (II) and an amine (II), the reaction prd. being chelated with lanthanide metal ion. The chelate is physically supported by a polymer so that the resulting wavelength-shifting device can be optically coupled to a photovoltaic cell.    USE/ADVANTAGE -   The condensn prod absorbs a significant level of energy from the energy rich part of the solar spectrum below ca. 450 nm, and transfers the energy to the lanthanide ion, which then emits or fluoresces at a longer wavelength which can be utilised by conventional photovoltaic cells. The chelated condensn. prods. have a long-lived fluorescence and a large Stoke's shift, absorbing energy at the energy rich part of the solar spectrum (280-460 nm) and emitting energy at 540 nm and beyond. The chelated condens. prods. are used eg in the form of a coating for photovoltaic cells.    (JP2660705-B2)      A wavelength-shifting device useful when optically coupled to a photoelectric cell to increase the portion of the solar spectrum available to the cell for conversion into electricity comprises the reaction prod. of a beta-diketone (I), an aldehyde (II) and an amine (II), the reaction prd. being chelated with lanthanide metal ion. The chelate is physically supported by a polymer so that the resulting wavelength-shifting device can be optically coupled to a photovoltaic cell.    USE/ADVANTAGE -   The condensn prod absorbs a significant level of energy from the energy rich part of the solar spectrum below ca. 450 nm, and transfers the energy to the lanthanide ion, which then emits or fluoresces at a longer wavelength which can be utilised by conventional photovoltaic cells. The chelated condensn. prods. have a long-lived fluorescence and a large Stoke's shift, absorbing energy at the energy rich part of the solar spectrum (280-460 nm) and emitting energy at 540 nm and beyond. The chelated condens. prods. are used eg in the form of a coating for photovoltaic cells.    (JP2691398-B2)      A wavelength-shifting device useful when optically coupled to a photoelectric cell to increase the portion of the solar spectrum available to the cell for conversion into electricity comprises the reaction prod. of a beta-diketone (I), an aldehyde (II) and an amine (II), the reaction prd. being chelated with lanthanide metal ion. The chelate is physically supported by a polymer so that the resulting wavelength-shifting device can be optically coupled to a photovoltaic cell.    USE/ADVANTAGE -   The condensn prod absorbs a significant level of energy from the energy rich part of the solar spectrum below ca. 450 nm, and transfers the energy to the lanthanide ion, which then emits or fluoresces at a longer wavelength which can be utilised by conventional photovoltaic cells. The chelated condensn. prods. have a long-lived fluorescence and a large Stoke's shift, absorbing energy at the energy rich part of the solar spectrum (280-460 nm) and emitting energy at 540 nm and beyond. The chelated condens. prods. are used eg in the form of a coating for photovoltaic cells.