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Wada, Atsushi*; Watanabe, Masayuki; Yamanoi, Yoshinori*; Nankawa, Takuya; Namiki, Kosuke*; Yamasaki, Mikio*; Murata, Masaki*; Nishihara, Hiroshi*
Bulletin of the Chemical Society of Japan, 80(2), p.335 - 345, 2007/02
Times Cited Count：22 Percentile：57.38(Chemistry, Multidisciplinary)Lanthanide complexes with linear and cyclic octadentate oligopyridine-amine ligands were synthesized, and their molecular structures were determined by single-crystal X-ray crystallography. All of the complexes had a distorted capped square antiprism (CSAP) geometry, and the coordination environments of lanthanide complexes were more distortedfor the complexes with the linear ligand than those with the cyclic ligand. The Eu
complexes with the linear ligand showed more intense emissions, which were attributed to the 
D
F
transition, than the complex withthe cyclic ligand in acetonitrile, which can be attributed to the distortion in the coordination environments. These results indicate that the coordination environments of lanthanide complexes, and thus the luminescence properties, can be controlled by tuning the geometrical structures of polydentate ligands.
Watanabe, Masayuki; Nankawa, Takuya*; Yamada, Teppei*; Kimura, Takaumi; Namiki, Kosuke*; Murata, Masaki*; Nishihara, Hiroshi*; Tachimori, Shoichi
Inorganic Chemistry, 42(22), p.6977 - 6979, 2003/11
Times Cited Count：34 Percentile：75.29(Chemistry, Inorganic & Nuclear)A tripodal ligand, tris(2-pyridyl)carbinol affords a novel tetradentate coordination mode in homodinuclear lanthanide complexes, which exhibit remarkably short distance between the metal ions. Strong fluorescence of Eu(III) and Tb(III) complexes with the ligand demonstrate that the ligand has a suitable excited state for energy transfer from the ligand to Eu(III) and Tb(III) center.
Watanabe, Masayuki; Nankawa, Takuya; Wada, Atsushi*; Namiki, Kosuke*; Murata, Masaki*; Nishihara, Hiroshi*; Kimura, Takaumi
no journal, ,
A tripodal ligand, tris(2-pyridyl)carbinol affords a novel tetradentate coordination mode in homodinuclear lanthanide complexes, which exhibit remarkably short distances between metal ions. Structures of dinuclear complexes synthesized from triflates exhibited the same structure other than the difference in the bond lengths which was induced by lanthanide contraction across the lanthanide series from Pr to Lu. In these complexes, the distance between two lanthanide ions was remarkably short. In this study the same type of dinuclear complexes were synthesized from nitrates. The nitrate ion can coordinate in both monodentate fand bidentate fashions. Since ionic radii are dependent upon the coordination number, nitrate could affect the metal-metal distance. In fact, dinuclear complexes exhibited longer distance between lanthanide ions than the triflates due to the increase of ionic radii of lanthanide ions. Some features of these dinuclear systems, which are induced from the difference of metal-metal distance, will be discussed in the presentation.
