title: Manifestation of π-π stacking interactions in luminescence properties and energy transfer in aromatically-derived Tb, Eu and Gd tris(pyrazolyl)borate complexes.
abstract: The three new complexes Tp(Py)Ln(CH3CO2)2(H2O) (Ln = Eu (1), Gd(2), or Tb (3)) were prepared and characterized crystallographically. In the crystal lattices of these complexes, separate molecules are connected in infinite chains by π-stacking interactions. Complexes 1 and 3 display intense photoluminescence and triboluminescence (red and green respectively), while compound 3 exhibits electroluminescence commencing at 9 V in an ITO/PVK/3/Al device (ITO = indium-tin oxide, PVK = poly(N-vinylcarbazole)). A series of Eu/Tb-doped Gd compounds was prepared by cocrystallization from mixtures of 1 and 2 or 2 and 3, respectively. It was shown that π-stacking interactions are involved in increasing the efficiency of energy transfer from the gadolinium complex to emitting [Tp(Py)Eu](2+) or [Tp(Py)Tb](2+) centers, and this energy transfer occurs through hundreds of molecules, resembling the process of energy harvesting in chloroplast stacks.
authors: †L. V. Pisarzhevskii Institute of Physical Chemistry of the National Academy of Sciences of Ukraine, Prospekt Nauki 31, Kiev, 03028, Ukraine.
authors: Elena A
authors: EA
authors: Mikhalyova
authors: †L. V. Pisarzhevskii Institute of Physical Chemistry of the National Academy of Sciences of Ukraine, Prospekt Nauki 31, Kiev, 03028, Ukraine.
authors: Anastasiya V
authors: AV
authors: Yakovenko
authors: ‡STARBURSTT CyberInstrumentation Consortium and Department of Chemistry, Youngstown State University, One University Plaza, Youngstown, Ohio 44555-3663, United States.
authors: Matthias
authors: M
authors: Zeller
authors: §N. S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninsky Prosp. 31, 119991 Moscow, GSP-1 Russian Federation.
authors: Mikhail A
authors: MA
authors: Kiskin
authors: ∥Institute of Semiconductor Physics of the National Academy of Sciences of Ukraine, Prospekt Nauki 41, Kiev, 252028, Ukraine.
authors: Yuriy V
authors: YV
authors: Kolomzarov
authors: §N. S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninsky Prosp. 31, 119991 Moscow, GSP-1 Russian Federation.
authors: Igor L
authors: IL
authors: Eremenko
authors: ⊥Department of Chemistry, Drexel University, Philadelphia, Pennsylvania 19104-2816, United States.
authors: Anthony W
authors: AW
authors: Addison
authors: †L. V. Pisarzhevskii Institute of Physical Chemistry of the National Academy of Sciences of Ukraine, Prospekt Nauki 31, Kiev, 03028, Ukraine.
authors: Vitaly V
authors: VV
authors: Pavlishchuk
mesh_terms: D001881:Borates / Q000737:chemistry*; D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry*; D004735:Energy Transfer; D004871:Erbium / Q000737:chemistry*; D005682:Gadolinium / Q000737:chemistry*; D028581:Lanthanoid Series Elements / Q000737:chemistry; D049449:Luminescence; D015394:Molecular Structure; D011720:Pyrazoles / Q000737:chemistry*; D013725:Terbium / Q000737:chemistry*
chemical_list: D001881:Borates; D056831:Coordination Complexes; D028581:Lanthanoid Series Elements; D011720:Pyrazoles; C555951:tris(pyrazolyl)borate; D013725:Terbium; D004871:Erbium; D005682:Gadolinium