Though 2-arylperimidines have never been used in iridium(III) chemistry, the present study on structural, electronic and optical properties of N-unsubstituted and N-methylated 2-(2-thienyl)perimidines, supported by DFT/TDDFT calculations, has shown that these ligands are promising candidates for construction of light-harvesting iridium(III) complexes. In contrast to N-H perimidine, the N-methylated ligand gave the expected cyclometalated μ-chloro-bridged iridium(III) dimer which was readily converted to a cationic heteroleptic complex with 4,4′-dicarboxy-2,2′-bipyridine. The resulting iridium(III) dye exhibited panchromatic absorption up to 1000 nm and was tested in a dye-sensitized solar cell.
Belt conveyors are widely used in various transport systems. The major cost for their operation consists, most often, of the means for rollers maintenance especially when belt conveyors are in the dusty explosive environment, for example, in mining industry. To prevent or reduce probability of fires, it is necessary to prevent jamming of rollers. For this purpose the ultimate resistance of conveyor rollers at which their rotation stops, depending on the degree of filling of the belt cross-section area with cargo, locations of an idler in a support and condition of the contact surfaces of a roller with a belt has been defined. The adhesion coefficient of a roller with the conveyer belt has been defined experimentally on the full-size conveyor 1L80 at the laboratory of Kuzbass State Technical University applying specially manufactured device, furthermore the status of the contact surfaces of a belt and rollers has been altering by wetting. The analytical researches have been conducted on the basis of the theory of elasticity and laws of mechanics.
The reaction of sodium N-morpholine acetate with selenic and sulfuric acid and uranyl nitrate results in the formation of two novel open-framework compounds, |Na(Hmfa)|[(UO2)2(SeO4)3(H2O)](H2O)2 (NaUSe) and [Na2(SO3OH)(Hmfa)]|(UO2)(SO4)2| (NaUS), respectively. Despite identical synthetic procedures, sulfate structure dramatically differs from selenate compound. Their common feature is an open-framework featuring two-dimensional system of channels occupied by protonated morpholino-N-acetic acid species. Coordination of Na atoms is different. In NaUSe, [(UO2)2 (SeO4)3(H2O)]2− layers are pillared by {Na2O8(H2O)2(Hmfa)2} complexes to form a microporous framework. In NaUS, UO7 and SO4 polyhedra of [(UO2)(SO4)2]2− chains share common oxygen atoms with Na-centered tetrameric complexes providing a three-dimensional integrity of the structure. Both of the compounds are characterized by IR spectroscopy.
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