ABSTRACT
The reagents 1,2-C6H4(CH=NR)(SMe), R = CH2CH2NMe2 or Ph, react with [Pt2Me4(µ-SMe2)2] by oxidative addition of the aryl-sulfur bond to give the corresponding crystalline binuclear platinum(IV) compounds [Pt2Me4(µ-SMe)2(κ(2)-C,N-C6H4-2-CH=NR)2], as the isomers with Ci (R = CH2CH2NMe2 or Ph) or C1 (R = Ph) symmetry. These first examples of C-S bond activation at platinum(II) occur easily at room temperature, and the reactions give complex equilibria of isomeric products, from which the isolated compounds crystallise.
ABSTRACT
The complexes [PtMe2(NN)], NN = 2,2'-bipyridine = bipy, 1a; NN = di-2-pyridylamine = dpa, 1b; NN = di-2-pyridyl ketone = dpk, 1c, NN = 4,4'-bis(ethoxycarbonyl)-2,2'-bipyridine, bebipy, react with m-chloroperoxybenzoic acid to give the platinum(IV) complexes [Pt(OH)(O2C-3-C6H4Cl)Me2(NN)], NN = bipy, 2, or [Pt(OH)(OH2···O2C-3-C6H4Cl)Me2(NN)], NN = bipy, 3a; dpa, 3b; bebipy, 3d, or [Pt(OH)2Me2(dpkOH)]3[Pt(OH)(OH2)Me2(dpkOH)][H(O2C-3-C6H4Cl)2]·2MeOH, 43·5·2MeOH. The reactions are proposed to occur by a polar oxidative addition mechanism, followed in most cases by the coordination of water. Complex 3a crystallises as a supramolecular polymer, the compound 43·5·2MeOH crystallises as a supramolecular sheet structure, and 3d easily forms a gel, all through strong intermolecular hydrogen bonding.
ABSTRACT
Herein we report the one-pot electrodeposition of copper indium gallium diselenide, CuIn(1-x)Ga(x)Se(2) (CIGS), thin films as the p-type semiconductor in an ionic liquid medium consisting of choline chloride/urea eutectic mixture known as Reline. The thin films were characterized by scanning electron microscopy with energy dispersive X-ray analysis, transmission electron microscopy, X-ray photoelectron spectroscopy, Raman microspectroscopy, and UV-visible spectroscopy. Based on the results of the characterizations, the electrochemical bath recipe was optimized to obtain stoichiometric CIGS films with x between 0.2 and 0.4. The chemical activity and photoreactivity of the optimized CIGS films were found to be uniform using scanning electrochemical microscopy and scanning photoelectrochemical microscopy. Low-cost stoichiometric CIGS thin films in one-pot were successfully fabricated.
