Structural and near-IR photophysical studies on ternary lanthanide complexes containing poly(pyrazolyl)borate and 1,3-diketonate ligands

Dalton Transactions : an International Journal of Inorganic Chemistry
Graham M DaviesMichael D Ward

Abstract

The ligands tris[3-(2-pyridyl)pyrazol-1-yl]hydroborate (L1, potentially hexadentate) and bis[3-(2-pyridyl)pyrazol-1-yl]dihydroborate (L2, potentially tetradentate) have been used to prepare ternary lanthanide complexes in which the remaining ligands are dibenzoylmethane anions (dbm). [Eu(L1)(dbm)2] is eight-coordinate, with L1 acting only as a tetradentate chelate (with one potentially bidentate arm pendant) and two bidentate dbm ligands. [Nd(L1)(dbm)2] was also prepared but on recrystallization some of it rearranged to [Nd(L1)2][Nd(dbm)4], which contains a twelve-coordinate [Nd(L1)2]+ cation (two interleaved hexadentate podand ligands) and the eight-coordinate anion [Nd(dbm)4]- which, uniquely amongst eight-coordinate complexes having four diketonate ligands, has a square prismatic structure with near-perfect O8 cubic coordination. Formation of this sterically unfavourable geometry is assumed to arise from favourable packing with the pseudo-spherical cation. The isostructural series of complexes [Ln(L2)(dbm)2](Ln = Pr, Nd, Eu, Gd, Tb, Er, Yb) was also prepared and all members structurally characterised; again the metal ions are eight-coordinate, from one tetradentate ligand L2 and two bidentate dbm ligands. Photophysical studi...Continue Reading

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Jun 9, 2009·Chemical Communications : Chem Comm·Gianluca AccorsiAldo Romani
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Sep 29, 2005·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Graham M DaviesMichael D Ward
Apr 30, 2008·Dalton Transactions : an International Journal of Inorganic Chemistry·Guo-Xi WangSongping D Huang
Mar 18, 2009·Dalton Transactions : an International Journal of Inorganic Chemistry·Jing FengHong-Jie Zhang
May 15, 2009·Dalton Transactions : an International Journal of Inorganic Chemistry·Stephen FaulknerDaniel Sykes
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