- Complexes of (EtO)2P(O)CH2P(O)(OEt)2 with lanthanide nitrates
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The preparation of complexes of (EtO)2P(O)CH2P(O) (OEt)2 = L, with lanthanide nitrates is described. Stable complexes with composition LnL2(NO3)S can be isolated for Ln = La-Eu and fully characterised. For Ln = Gd-Lu solid compounds could not be isolated. Conductivity and 31P NMR spectroscopy indicate structural changes in solution between the lighter and heavier lanthanides and, whilst electrospray mass spectrometry confirms a dramatic difference in behaviour with complexes of the heavier lanthanides readily decomposing via loss of EtNO3, other experiments show that this does not occur under the conditions of complex formation. The single crystal X-ray structures for Ln = La and Sm show the nitrates and OEt groups to be in close proximity. The changes in spectroscopic properties correlate well with the difficulties in isolating the complexes of heavier metals, and are possibly due to the formation of dimeric complexes rather than loss of ethyl nitrate.
- Lees, Anthony M. J.,Kresinski, Roman A.,Platt, Andrew W. G.
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- Zirconium organophosphonates as photoactive and hydrophobic host materials for sensitized luminescence of Eu(III), Tb(III), Sm(III) and Dy(III)
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Novel luminescent materials based on lanthanides [Eu(III), Tb(III), Sm(III), and Dy(III)] and a mixed zirconium phenyl- and m-sulfophenyl phosphonate as the host matrix, have been prepared and photophysically characterized. Powder X-ray diffraction, 31P-MAS-NMR spectroscopy, IR spectroscopy, and diffuse-reflectance UV spectroscopy revealed the specificity of these materials such as a layered structure, the presence of phenyl groups in the galleries, and the ability to absorb lanthanide ions introduced by simple ion exchange. Characteristic line-shaped long-lived luminescence [ca. 0.27 ms for EU(III), 0.80 ms for Tb(III), and 0.05 ms for Sm(III)] was observed for different lanthanide ions, and was demonstrated to be generated by an antenna-induced energy transfer process to the metal. The overall luminescence quantum yield of europium- or terbium-loaded materials was measured to be ca. 0.3%. A detailed analysis of the EU(III) luminescence spectrum and H 2O/D2O exchange experiments indicated the presence of ca. 3 water molecules around each lanthanide. Based on the high maximum coordination numbers of lanthanides, up to 9 for free EU(III) in aqueous solutions, and the presence of only monodentate sulfonate binding sites, more water could be expected. This observation is explained by the rather hydrophobic microenvironment in the interlamellar space of the materials, due to pendant organic moieties, that is, the phenyl groups.
- Ferreira, Rita,Pires, Preciosa,De Castro, Baltazar,Sa Ferreira, Rute A.,Carlos, Luis D.,Pischel, Uwe
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- Non-metallic compd. Bisphosphonic acid crosslinked layered manufacturing method
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PROBLEM TO BE SOLVED: To provide a novel noncrosslinking type layered phosphonic acid metal compound which has high crystallinity and a uniformly introduced multicomponent phosphonic acid and is free of a fluorine atom, and to provide a method for the production of the same.SOLUTION: The method for the production of the noncrosslinking type layered phosphonic acid metal compound includes a reaction step of reacting two or more monophosphonic acids or derivatives thereof having predetermined conditions with a metal source that can generate a hexacoordinated metal atom ion to be a central atom (M) of a metal oxide octahedron upon reaction in the presence of a sulfuric acid catalyst. The noncrosslinking type layered phosphonic acid metal compound obtained by the production method is also provided.
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Paragraph 0097
(2017/01/02)
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- HIGH TEMPERATURE SULPHONATION OF BENZENEPHOSPHONIC ACID IN LIQUID SULPHUR TRIOXIDE
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The reaction of benzenephosphonic acid (I) and SO3 in the absence of solvent, at 2.2 .
- Montoneri, Enzo
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p. 201 - 204
(2007/10/02)
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- Organosulphur Phosphorus Acid Compounds. Part 1. m-Sulphophenylphosphonic Acid
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m-Sulphophenylphosphonic acid (2) is a high-temperature-melting (164 degC) and stable solid which has been synthesized from phenylphosphonic acid (1) and sulphur trioxide in the absence of solvent.Fractional precipitation of barium salts followed by ion e
- Montoneri, Enzo,Gallazzi, Maria C.,Grassi, Mariella
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p. 1819 - 1824
(2007/10/02)
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