Journal article
Combination of single-molecule magnet behaviour and luminescence properties in a new series of lanthanide complexes with tris(pyrazolyl)borate and oligo(beta-diketonate) ligands
Dalton transactions : an international journal of inorganic chemistry, v 49(23), pp 7774-7789
21 Jun 2020
PMID: 32406435
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Abstract
A series of tris(pyrazolyl)borate mono-, di- and trinuclear complexes, [Tp(2)Ln](n)X (Ln = Eu, Tb, Gd, Dy, Xn-= various mono-, bis- and tris(beta-diketonates) has been prepared. The Tb(3+)and Dy(3+)complexes are luminescent single molecular magnets (SMM) and exhibit luminescence quantum efficiencies up to 73% for the Tb(3+)and 4.4% for the Dy(3+)compounds. Similar Eu(3+)complexes display bright emission only at lower temperatures. The Dy(3+)and Tb(3+)complexes possess SMM behavior in a non-zero dc field at low temperatures, while the polynuclear Dy(3+)complexes also show slow magnetic relaxation even in zero dc field up to 8 K.U-eff-values determined from dynamic magnetic measurements were up to 31 and 6 cm(-1)for the Dy(3+)and Tb(3+)complexes, respectively. It was found that within a series of Dy(3+)and Tb(3+)compounds,U(eff)and luminescence quantum yields decreased with increasing nuclearity of the compounds and a shortening of the intramolecular Ln-Ln distance.Delta(Orbach)-values estimated from low-temperature luminescence spectra were significantly higher than those obtained from ac magnetic data, which may be due to involvement of additional processes in the relaxation mechanism (quantum tunneling, Raman, direct) reducing the energy barrier. Some of the Tb3+-compounds also display metal-centred electroluminescence, giving them potential as emitting layers in LEDs.
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Details
- Title
- Combination of single-molecule magnet behaviour and luminescence properties in a new series of lanthanide complexes with tris(pyrazolyl)borate and oligo(beta-diketonate) ligands
- Creators
- Elena A. Mikhalyova - L.V. Pisarzhevskii Institute of Physical ChemistryMatthias Zeller - Purdue University West LafayetteJerry P. Jasinski - Keene State CollegeRaymond J. Butcher - Howard Univ, Chem Dept, 525 Coll St NW, Washington, DC 20059 USALuca M. Carrella - Johannes Gutenberg University of MainzAlexander E. Sedykh - University of GiessenKonstantin S. Gavrilenko - EnamineSergey S. Smola - ODESSAMichael Frasso - West Virginia UniversitySebastian Calderon Cazorla - Purdue University West LafayetteKuluni Perera - Purdue University West LafayetteAnni Shi - Purdue University West LafayetteHabib G. Ranjbar - Purdue University West LafayetteCasey Smith - Purdue University West LafayetteAlexandru Deac - Purdue University West LafayetteYoulin Liu - Purdue University West LafayetteSean M. McGee - University of PotsdamVladimir P. Dotsenko - ODESSAMichael U. Kumke - University of PotsdamKlaus Mueller-Buschbaum - Justus Liebig Univ Giessen, Inst Inorgan & Analyt Chem, Heinrich Buff Ring 17, D-35392 Giessen, GermanyEva Rentschler - Johannes Gutenberg University of MainzAnthony W. Addison - Drexel UniversityVitaly V. Pavlishchuk - L.V. Pisarzhevskii Institute of Physical Chemistry
- Publication Details
- Dalton transactions : an international journal of inorganic chemistry, v 49(23), pp 7774-7789
- Publisher
- Royal Soc Chemistry
- Number of pages
- 16
- Grant note
- CHE 1625543 / National Science Foundation of the U.S. through the Major Research Instrumentation Program 90343 / Trilateral Partnerships amongst researchers of Ukraine, Russia, and Germany, through the VolkswagenStiftung Studienstiftung des deutschen Volkes 32/20-N / National Academy of Sciences of Ukraine Target Program of Fundamental Research "Prospective fundamental studies and innovative developments of nanomaterials and nanotechnologies for the needs of industry, health protection and agriculture" CHE-1039027 / NSF-MRI program; National Science Foundation (NSF); NSF - Office of the Director (OD)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemistry
- Web of Science ID
- WOS:000542720000013
- Scopus ID
- 2-s2.0-85086515212
- Other Identifier
- 991019169112904721
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- Collaboration types
- Industry collaboration
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Chemistry, Inorganic & Nuclear