Journal
INORGANIC CHEMISTRY
Volume 54, Issue 7, Pages 3125-3133Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ic502120g
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Funding
- National Academy of Sciences of Ukraine
- Russian Foundation for Basic Research [03-03-14, 14-03-90423]
- NSF [0087210]
- Ohio Board of Regents [CAP-491]
- Youngstown State University
- College of Arts & Sciences of Drexel University
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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 pi-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 p-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.
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