Sensitization of HoIII and SmIII luminescence by efficient energy transfer from antenna ligands: Magnetic, visible and NIR photoluminescence properties of GdIII, HoIII and SmIII coordination polymers

被引:45
作者
Coban, M. Burak [1 ,2 ]
Amjad, Asma [3 ,4 ]
Aygun, Muhittin [5 ]
Kara, Hulya [2 ,6 ]
机构
[1] Balikesir Univ, Ctr Sci & Tech App & Res, Balikesir, Turkey
[2] Balikesir Univ, Dept Phys, Fac Arts & Sci, Balikesir, Turkey
[3] Univ Florence, Dipartimento Chimia U Schiff, Sesto Fiorentino, FI, Italy
[4] Univ Florence, Udr INSTM, Sesto Fiorentino, FI, Italy
[5] Dokuz Eylul Univ, Dept Phys, Fac Arts & Sci, Izmir, Turkey
[6] Mugla Sitki Kocman Univ, Dept Phys, Fac Sci, Mugla, Turkey
关键词
Lanthanide complex; Hydrothermal synthesis; X-ray structure; Photoluminescence; Magnetic properties; SINGLE-MOLECULE MAGNET; LANTHANIDE-ORGANIC FRAMEWORKS; SCHIFF-BASE COMPLEXES; CRYSTAL-STRUCTURES; DYSPROSIUM(III) COMPLEXES; HYDROTHERMAL SYNTHESIS; THERMAL-PROPERTIES; ACID LIGAND; BEHAVIOR; SERIES;
D O I
10.1016/j.ica.2016.10.010
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
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)]center dot(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 Ln(III) 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 Ln(III) 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. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码:25 / 33
页数:9
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