Crystal structure and photoluminescence properties of lanthanide diphosphonates

abstract

Three lanthanide diphosphonates, [H3N( CH2)(4)NH3] Ln[ hedpH][hedpH(2)] ( Ln = La, Eu, Tb; hedp = 1-hydroxyethylidenediphosphonate), have been synthesized under hydrothermal conditions with 1,4-diaminobutane as the template. The structure of the La compound has been determined by single-crystal X-ray diffraction, crystallizing in the space group P-1. Powder XRD shows that the three compounds are isostructural. The crystal structure consists of polymeric La[ hedpH][ hedpH2] single chains built up from vertex-sharing LaO7 polyhedra and CPO3-tetrahedra. The chains are cross-linked by strong hydrogen bonds to form a three-dimensional network with large channels containing the template cations. The photoluminescence properties of the Eu and Tb materials have been investigated by photoluminescence spectroscopy, including steady-state emission and excitation spectra, and measurement of the lifetimes of the excited states.

keywords

METAL PHOSPHONATE CHEMISTRY; INDUCED MAGNETIC TRANSITIONS; HYDROTHERMAL SYNTHESIS; CHAIN STRUCTURES; COMPLEXES; IONS; HEDP=1-HYDROXYETHYLIDENEDIPHOSPHONATE; LUMINESCENCE; SILICATES; SOLIDS

subject category

Chemistry; Materials Science

authors

Liu, FY; Roces, L; Ferreira, RAS; Garcia-Granda, S; Garcia, JR; Carlos, LD; Rocha, J

our authors

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