A hybrid double-dot in silicon

We report electrical measurements of a single arsenic dopant atom in the tunnel-barrier of a silicon SET. As well as performing electrical characterization of the individual dopant, we study series electrical transport through the dopant and SET. We measure the triple points of this hybrid double dot, using simulations to support our results, and show that we can tune the electrostatic coupling between the two sub-systems.Comment: 11 pages, 6 figure

Diorganotin Derivatives of 2,6-dihydroxymethylpyridine and of 3-(n-pyrrolidino)-1,2-propanediol - Synthesis, Characterization and Invitro Antitumor-activity

Three diorganotin(IV) derivatives of 2, 6-dihydroxymethyl-pyridine and 3-(N-pyrrolidino)-1, 2-propanediol have been synthesized and characterized by Mossbauer spectroscopy, mass spectrometry and by H-1, C-13 and Sn-119 nmr. Their activities in vitro against two human tumor cell lines, MCF-7 and WiDr, are compared to those of cis-platin and doxorubicin

Organotin(iv) Compounds of 2-thiopyridine - Crystal and Molecular-structure of Dicyclohexyltin(iv) Bis(2-pyridylthiolate)

Dicyclohexyltin(IV) bis(2-pyridylthiolate), compound 1, crystallizes in the orthorhombic system, a = 16.448(3), b = 40.315(8) and c = 7.113(3). Its molecular structure is best described as a tetrahedron, based on the two carbon-tin and the two sulfur-tin bonds, which is however strongly distorted as a consequence of two weak additional nitrogen-tin bonds. Compound 1 and four other diorganotin(IV) bis(2-pyridylthiolates) are characterized by Mossbauer, H-1, C-13 and Sn-119 NMR spectroscopy, and by FAB mass spectrometry. Their in vitro antitumour activity against two human tumour cell lines, MCF-7 and WiDr is reported. The ID50 values found are comparable to those found for cis-platin, but deceptively higher than for many other diorganotin compounds