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|Title:||Structure, reactivity, luminescence and magnetism of dinuclear Ln 3+ complexes produced by the Ln3+-assisted hydrolysis of 3,6-bis(2-pyridyl)tetrazine||Authors:||Panayiotidou, Lefkia
Arabatzis, Nikos B.
Keramidas, Anastasios D.
|Major Field of Science:||Agricultural Sciences||Field Category:||Agricultural Biotechnology||Keywords:||Praseodymium;Samarium;Europium;Gadolinium;Terbium;Dysprosium;Acylhydrazone;Crystal structure;Reactivity;Luminescence;Magnetism||Issue Date:||12-Nov-2013||Source:||Polyhedron, 2013, vol. 64, pp. 308-320||Volume:||64||Start page:||308||End page:||320||Journal:||Polyhedron||Abstract:||Twelve Pr3+, Sm3+, Eu3+, Gd3+, Tb3+ and Dy3+ complexes of N-(pyridin-2-ylmethylene) picolinohydrazonate (phzp-) were synthesized by the Ln3+ assisted hydrolysis of 3,6-bis(2-pyridyl)-1,2,4,5-tetrazine. Crystallographic characterization of Pr3+, Sm3+ and Eu3+ hydrazonate complexes with nitrate or trifluoroacetyleacetonate co-ligands shows them to have binuclear structures with a planar Ln2O2 core and the ligand to be in its mono-anionic form. Exception is the Pr 3+ complex with nitrate co-ligand, which is a mononuclear species containing the neutral hydrazone. Paramagnetic 1D 1H and 2D gCOSY and gNOESY-gEXSY 1H NMR spectroscopies revealed the presence of different isomers exhibiting a sterically controlled fluxional behavior. In addition, phzp- significantly enhances the luminescence of Eu 3+ and Tb3+. Magnetic measurements show antiferromagnetic coupling between the Ln3+ ions in the dinuclear complexes. The structural characterization of the complexes in both solid state and solution show the versatility of phzp- ligand to adopt various ligating motifs.||ISSN:||0277-5387||DOI:||10.1016/j.poly.2013.05.037||Rights:||© Elsevier||Type:||Article||Affiliation :||Cyprus University of Technology
University of Cyprus
University of Patras
Technological Education Institute of Patras
Foundation of Research and Technology (F.O.R.T.H.)
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