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Title: Synthesis, structural, photophysical and thermal studies of benzoate bridged Sm(III) complexes
Authors: Singh U.P.
Kumar R.
Upreti S.
Published in: Journal of Molecular Structure
Abstract: One samarium coordination polymer (chain like) 1 with composition [{Sm(OBz)3(MeO)2}2]n has been prepared from the reaction of SmCl3 and sodium benzoate in 1:3 ratio whereas four binuclear samarium complexes with chemical composition [{(tp)Sm(μ-p-X-OBz)2}2] have been prepared by the reaction of SmCl3, potassium hydrotris(pyrazol-1-yl)borate [K(tp)] and sodium p-X-benzoate (where X = H, Cl, F, NO2) in 1:1:2 ratio. These complexes have been characterized by elemental analysis, IR spectroscopy, thermogravimetry, optical properties, X-ray and magnetic measurement studies. The X-ray structure shows that the complexes 2-5 are isostructural whereas the structure of 1 is different. The coordination number around metal center in 1 is eight whereas in complexes 2-5, each samarium is seven coordinate. The X-ray studies indicate that the complex 1 crystallizes in monoclinic space group P2(1)/c with the cell dimensions a = 9.75(7), b = 21.83(15), c = 22.28(15) Ã…, whereas the complexes 2 and 3 crystallizes isostructurally in the triclinic space group P over(1, -) with the cell dimension a = 11.77(10), b = 12.60(10), c = 17.57(13) Ã… and a = 9.55(3), b = 12.80(4), c = 14.47(5) Ã…, respectively. The samarium ions in 2 and 3 are coordinated by three N atoms of pyrazolylborate ligand and four O atoms from benzoate groups. The photophysical properties of above complexes have been studied with ultraviolet absorption, excitation and emission spectral studies. The complexes 1-5 excited at 240 nm wavelength produced characteristic luminescence features, arising mostly due to the f-f transitions. © 2006 Elsevier B.V. All rights reserved.
Citation: Journal of Molecular Structure (2007), 831(43833): 97-105
Issue Date: 2007
Keywords: Carboxylate ligands
Photophysical properties
X-ray studies
ISSN: 222860
Author Scopus IDs: 57203181883
Author Affiliations: Singh, U.P., Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247 667, India
Kumar, R., Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247 667, India
Upreti, S., Department of Chemistry, Indian Institute of Technology Delhi, New Delhi, 110 016, India
Funding Details: The authors are grateful to MHRD for financial support in the form research project and Prof. A. Ramanan, IIT Delhi for X-ray data collection of complex 1 and 3 .
Corresponding Author: Singh, U.P.; Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247 667, India; email:
Appears in Collections:Journal Publications [CY]

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