Abstract. We, the organizers and participants, report our experiences from the 1st Verified Software Competition, held in August 2010 in Edinburgh at the VSTTE 2010 conference.
The optical and electrochemical properties of three cadmium benzenethiolate clusters, Cd(SPh)42-, Cd4(SPh)lo2-, and Cdl,$4(SPh)16e, are studied as function of the cluster size. The Cd, clusters (n = 1,4, 10) which may represent molecular models for the semiconductor CdS show structured absorption spectra that are assigned to both ligand-t*metal charge-transfer (LMCT) and intraligand transitions. The absorption and emission bands of Cdlo are red-shifted compared to those of Cdl and Cd,. The emission of the Cd, clusters (n = 4, 10) is ascribed to a LMCT transition as suggested by the short luminescence lifetimes and the red shift with increasing cluster size. Illumination of the Cd, clusters yields thianthrene, dibenzothiophene, and benzenethiol, the rate of photodegradation depending on the cluster size. Electrochemical studies of Cd, show that, with increasing cluster size, the oxidation potential is shifted negative while the reduction potential is shifted positive. Both Cd, and Cdlo form charge-transfer complexes with methyl viologen. However, steady-state illumination of these clusters in the presence of methyl viologen does not result in the formation of the methyl viologen radical cation.
h TMEDA (2 mL) was distilled into the reaction flask. All but-3 mL of THF was removed under vacuum, and 30 mL of diethyl ether was distilled into the reaction flask. The solution was filtered, and the solvent was removed by vacuum distillation. The solid product (red-orange) was washed with 40 mL of hexane, and solvent was removed under vacuum, giving a 91 9% yield of 2.2TMEDA. Slow evaporation of a EhO solution of 2-2TMEDA yielded crystals suitable for X-ray diffraction. ' H NMFt (200 MHz,
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