Monomeric and Dimeric Erbium(III) Complexes: Crystal Structure and Photoluminescence Studies |
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Authors: | Email author" target="_blank">Eny?KusriniEmail author Muhammad?I?Saleh Anwar?Usman |
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Institution: | (1) Department of Chemical Engineering, Faculty of Engineering, Universitas Indonesia, 16424 Depok, Indonesia;(2) School of Chemical Sciences, Universiti Sains Malaysia, 11800 Penang, Malaysia;(3) Department of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University, 30010 Hsinchu, Taiwan, Republic of China |
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Abstract: | Abstract The crystal structure and photoluminescence (PL) studies of the monomeric and dimeric Er(III) complexes with two different
chelating ligands (anthracene-9-carboxylic acid, 9-ACA; pentaethylene glycol, EO5; and picric acid, HPic) are reviewed. The
Er(III) metal ion was coordinated to the attached ligands in eight- and nine-coordination number. The dimeric Er2(9-AC)6(DMF)2(H2O)2] complex shows the presence of deprotonated 9-AC anions with the negatively charged oxygen atoms bridged two Er(III) ions
leads to a great coordinative flexibility via three possibilities of coordination modes, i.e. monodentate, chelation bidentate,
chelating–bridging tridentate, where 9-AC = anthracene-9-carboxylate anion. The monomeric Er(Pic)2(EO5)](Pic) complex displays the important flexible structure of the acyclic EO5 ligand and the role of Pic anions act as
bidentate and monodentate chelations. The PL spectra of both Er(III) complexes show a broad band with the center peak position
being dependent on the attached aromatic ligands. The heavier lanthanide complexes show the difference in structures, coordination
geometry environment, and luminescence properties compared to the lighter lanthanide complexes. The energy transfer process
in the complexes could be optimized with maximize the overlap between the emission spectrum of donor atom and absorption spectrum
of acceptor atom. |
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