| Author |
Mikhalyova, Elena A. Kiskin, Mikhail A. Gavrilenko, Konstantin S. Smola, Sergey S. Zeller, Matthias Pavlishchuk, Vitaly V. Yakovenko, Anastasiya V. Eremenko, Igor L. Addison, Anthony W. Dotsenko, Vladimir P. |
| Description |
Author Affiliation: Mikhalyova EA ( L. V. Pisarzhevskii Institute of Physical Chemistry of the National Academy of Sciences of the Ukraine, Prospekt Nauki 31, Kiev, 03028, Ukraine. shchuk@inphyschem-nas.kiev.ua.); Yakovenko AV ( L. V. Pisarzhevskii Institute of Physical Chemistry of the National Academy of Sciences of the Ukraine, Prospekt Nauki 31, Kiev, 03028, Ukraine. shchuk@inphyschem-nas.kiev.ua.); Zeller M ( STARBURSTT CyberInstrumentation Consortium and Department of Chemistry, Youngstown State University, One University Plaza, Youngstown OH 44555-3663, USA and Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN 47907, USA. zeller4@purdue.edu.); Gavrilenko KS ( Chembiocenter, Taras Shevchenko National University Of Kiev, Chervonotkatska, 61, 03022, Kiev, Ukraine.); Kiskin MA ( N. S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninsky Prosp. 31, 119991 Moscow, GSP-1, Russian Federation.); Smola SS ( A.V. Bogatsky Physico-Chemical Institute of the National Academy of Sciences of the Ukraine, 86 Lustdorfskaya doroga, 65080 Odessa, Ukraine.); Dotsenko VP ( A.V. Bogatsky Physico-Chemical Institute of the National Academy of Sciences of the Ukraine, 86 Lustdorfskaya doroga, 65080 Odessa, Ukraine.); Eremenko IL ( N. S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninsky Prosp. 31, 119991 Moscow, GSP-1, Russian Federation.); Addison AW ( Department of Chemistry, Drexel University, Philadelphia, PA 19104-2816, USA. AddisonA@drexel.edu.); Pavlishchuk VV ( L. V. Pisarzhevskii Institute of Physical Chemistry of the National Academy of Sciences of the Ukraine, Prospekt Nauki 31, Kiev, 03028, Ukraine. shchuk@inphyschem-nas.kiev.ua.) |
| Abstract |
A series of brightly luminescent new mononuclear $Tp^{Py}Ln(An)_{2}(H_{2}O)$ (where $An^{−}$ = carboxylate anion, Ln = Eu or Tb and $Tp^{Py−}$ = tris(3-(2′-pyridyl)pyrazolyl)borate) and dinuclear $(Tp^{Py}Ln)_{2}pma(MeOH)_{2}$ (Ln = Eu, Tb, $pma^{4−}$ = tetraanion of pyromellitic acid) complexes were prepared and characterized by X-ray crystallography. Within each series the compounds possess similar molecular structures, which differ only by the nature of the carboxylate anions. The quantum efficiencies for metal-centered emission of the complexes were up to 29(3)% for $Eu^{3+}$ and 53(5)% for the $Tb^{3+}$ compounds and significantly depend on the electronic structure of the additional ligand (i.e. the carboxylate). The aliphatic carboxylate compounds’ luminescence quantum yields were all similar, but different from those for the aromatic ones. The complexes with trifluoroacetate and pentafluorobenzoate unexpectedly displayed lower quantum efficiencies compared to those with the corresponding non-fluorinated analogues. Energy transfer from $Tb^{3+}$ to $Eu^{3+}$ occurs in a mixture of $(Tp^{Py}Eu)(pma)(TbTp^{Py})(MeOH)_{2},$ $(Tp^{Py}Eu)_{2}(pma)(MeOH)_{2}$ and $(Tp^{Py}Tb)_{2}(pma)(MeOH)_{2}$ but is not very efficient. The $Tb^{3+}-compounds$ displayed green electroluminescence, and both the $Eu^{3+}$ and $Tb^{3+}$ complexes exhibited bright metal-centered red $(Eu^{3+})$ or green $(Tb^{3+})$ triboluminescence. |
