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Title: Synthesis, structural characterization, photoluminescence and thermal properties of [(Ph3P)2cu(μ-SeC{O}R)2Cu (PPh3)]
Authors: Lu, Z.
Huang, W. 
Vittal, J.J. 
Issue Date: 2002
Citation: Lu, Z., Huang, W., Vittal, J.J. (2002). Synthesis, structural characterization, photoluminescence and thermal properties of [(Ph3P)2cu(μ-SeC{O}R)2Cu (PPh3)]. New Journal of Chemistry 26 (9) : 1122-1129. ScholarBank@NUS Repository.
Abstract: A number of neutral unsymmetrical dimers [(Ph3P)2Cu(μ-SeC{O}R)2Cu (PPh3)] (R = C6H5 (1), C6H4-Me-4 (2), C6H4-OMe-4 (3), C6H4-Cl-4 (4), C6H4-F-4 (5) and CH3 (6)) were synthesized in moderate yield, and characterized by analytical and spectroscopic techniques including 31P NMR. Variable temperature 31P NMR experiments appear to indicate that the molecular structure is retained in solution. X-Ray structure determination of 2 and 6 confirmed the molecular geometry of the unsymmetrical dimer. In 2 the two 4-MeO-C6H4C=O groups have anti stereochemistry with respect to the Cu2Se2 ring while MeC=O groups have syn configuration in 6. A weak C-H⋯O=C intramolecular hydrogen bond present between the two selenoacetato ligands appears to dictate the syn geometry in 6. This hydrogen bonding is also responsible for the non-planarity of the Cu2Se2 ring. These compounds are photoemissive in CH2Cl2 solution. Thermogravimetry and pyrolysis experiments in nitrogen atmosphere show that 1-6 are good single source precursors to copper selenide bulk materials. Preliminary experiments show that these compounds are good single source molecular precursors for cubic phase Cu2-xSe nanoparticles with an average size of 75 ± 15 nm.
Source Title: New Journal of Chemistry
ISSN: 11440546
DOI: 10.1039/b203466b
Appears in Collections:Staff Publications

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