Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/1133
Title: Synthesis, crystal structure, and photoluminescence of homodinuclear lanthanide 4-(Dibenzylamino) benzoate complexes
Authors: Ramya, A R
Reddy, M L P
Cowley, A H
Vasudevan, K V
Keywords: Onversion molecular device
Luminescence quantum yield
Earth benzoate complexes
Trivalent lanthanides
Spectroscopic properties
Europium (iii) complexes
Infrared transitions
Emitting materials
Issue Date: 2010
Publisher: American Chemical Society
Citation: Inorganic Chemistry 49(5):2407-2415;1 Mar 2010
Abstract: Three new binuclear lanthanide complexes of general formula [Ln(2)(L)(6)(H2O)(4)] (Ln = Tb (1), Eu (2), and Gd (3)) supported by the novel aromatic carboxylate ligand 4-(dibenzylamino)benzoic acid (HL) have been synthesized. Complexes 1 and 2 were structurally characterized by single-crystal X-ray diffraction. Both 1 and 2 crystallize in the triclinic space group P-(1) over bar, and their molecular structures consist of homodinuclear species that are bridged by two oxygen atoms from two carboxylate ligands via different coordination modes. The discrete bridged dimer of 1 is centrosymmetric and features 8-coordinate terbium atoms, each of which adopts a distorted square-antiprismatic geometry. Both coordination spheres comprise two eta(2)-chelating benzoates, two mu-eta(1):eta(1)-carboxylate interactions from the bridging benzoates, and two water molecules. By contrast, in complex 2, the Eu3+ ion coordination environment is best described as a distorted tricapped-trigonal prism, each europium ion being coordinated to three eta(2)-chelating benzoate ligands and two water molecules. One of the eta(2)-carboxylate ligands is involved in a further interaction with an adjacent metal, thus rendering the overall binding mode bridging tridentate, mu-eta(2):eta(1). Scrutiny of the packing diagrams for 1 and 2 revealed the existence of a one-dimensional molecular array that is held together by intermolecular hydrogen-bonding interactions. The Tb3+ complex 1 exhibits high green luminescence efficiency in the solid state with a quantum yield of 82%. On the other hand, poor luminescence efficiency has been noted for the Eu3+-4-(dibenzylamino)benzoate complex.
URI: http://ir.niist.res.in:8080/jspui/handle/123456789/1133
ISSN: 0020-1669
Appears in Collections:2010

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