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000112080 084__ $$2WoS$$aChemistry, Physical
000112080 084__ $$2WoS$$aPhysics, Atomic, Molecular & Chemical
000112080 1001_ $$0P:(DE-HGF)0$$aAhmed, M.$$b0
000112080 245__ $$aPhotoelectron Spectra of Some Antibiotic Building Blocks: 2-Azetidinone and Thiazolidine-Carboxylic Acid
000112080 260__ $$aWashington, DC$$bSoc.$$c2012
000112080 300__ $$a8653 - 8660
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000112080 440_0 $$03693$$aJournal of Physical Chemistry A$$v116$$x1089-5639$$y33
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000112080 500__ $$aWe wish to thank Professor D. P. Chong for his assistance in the Delta DFT calculations. M.A. and A.G. acknowledge the Swinburne University Postgraduate Research Award (SUPRA) and the Australian Research Council (ARC) for scholarship support. The National Computational Infrastructure (NCI) at the Australian National University under the Merit Allocation Scheme (MAS), the Victorian Partnership for Advanced Computing (VPAC), and Swinburne University Supercomputing Facilities are acknowledged. We acknowledge the Australian Synchrotron for travel funding under the International Synchrotron Access Program (ISAP) and Sincrotrone Trieste (Elettra) for beamtime allocation. We thank our colleagues at Elettra for providing good quality synchrotron light.
000112080 520__ $$aX-ray photoelectron spectra of the core and valence levels of the fundamental building blocks of β-lactam antibiotics have been investigated and compared with theoretical calculations. The spectra of the compounds 2-azetidinone and the 2- and 4-isomers of thiazolidine-carboxylic acid are interpreted in the light of theoretical calculations. The spectra of the two isomers of thiazolidine-carboxylic acid are rather similar, as expected, but show clear effects due to isomerization. Both isomers are analogues of proline, which is well-known to populate several low energy conformers in the gas phase. We have investigated the low energy conformers of thiazolidine-4-carboxylic acid theoretically in more detail and find some spectroscopic evidence that multiple conformers may be present. The measured valence levels are assigned for all three compounds, and the character of the frontier orbitals is identified and analyzed.
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000112080 7001_ $$0P:(DE-HGF)0$$aGanesan, A.$$b1
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000112080 7001_ $$0P:(DE-Juel1)VDB107718$$aFeyer, V.$$b3$$uFZJ
000112080 7001_ $$0P:(DE-HGF)0$$aPlekan, O.$$b4
000112080 7001_ $$0P:(DE-HGF)0$$aPrince, K. C.$$b5
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