Sensitization of Ho^sup III^ and Sm^sup III^ luminescence by efficient energy transfer from antenna ligands: Magnetic, visible and NIR photoluminescence properties of Gd^sup III^, Ho^sup III^ and Sm^sup III^ coordination polymers

Hydrothermal reactions of lanthanide metal salts with 2-sulfoterephthalate (2-stp) and 4,4′-bipyridine (4,4′-bipy) led to three coordination polymers, {[Ln(2-stp)(4,4′-bipy)(H2O)]·(H2O)}, [Ln = Gd (1), Ho (2) and Sm (3)]. Their structures have been established by X-ray single crystal diffraction. Co...

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Bibliographic Details
Published in:Inorganica Chimica Acta 2017-01, Vol.455, p.25
Main Authors: Coban, M Burak, Amjad, Asma, Aygun, Muhittin, Kara, Hulya
Format: Article
Language:English
Subjects:
Antiferromagnetism
Coordination polymers
Crystal structure
Diffraction
Energy transfer
Gadolinium
Hydrogen bonds
Hydrothermal reactions
Ions
Ligands
Luminescence
Magnetic permeability
Magnetic properties
Photoluminescence
Polymers
Samarium
Single crystals
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Summary:Hydrothermal reactions of lanthanide metal salts with 2-sulfoterephthalate (2-stp) and 4,4′-bipyridine (4,4′-bipy) led to three coordination polymers, {[Ln(2-stp)(4,4′-bipy)(H2O)]·(H2O)}, [Ln = Gd (1), Ho (2) and Sm (3)]. Their structures have been established by X-ray single crystal diffraction. Complexes 1–3 are isostructural with 2D framework in which all LnIII atoms are nine-coordinated. All these 2D layers are further interlinked via hydrogen bonds resulting in 3D architecture. The solid-state photoluminescence measurements display the characteristic luminescence of Ho (2) and Sm (3), which is due to efficient energy transfer from the ligands to the central LnIII ions via an “antenna effect”. Variable-temperature magnetic susceptibility and isothermal magnetization as function of external magnetic field for 1–3 is studied which reveal mainly the presence of antiferromagnetic interactions and the thermal depopulation of Stark sublevels together with crystal field affects.
ISSN:0020-1693
1873-3255