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Information × Registration Number 0304U004162, 0103U004188 , R & D reports Title Quazi-twodimensional conductors and semiconductors based on the sulphur- and nitrogen containg compounds popup.stage_title Комплекси dmit (ізотритіондитолу) Head Starodub V., Registration Date 25-03-2004 Organization Kharkov National University named after V.N.Karazin popup.description2 Objects of investigation: cation-radical salts, based on the bys-ethilenodithiolo-tetrathiofylvalene (ET) with anion, based on the iso-polyacids, isotrithiondithiolatometalates of transition metals - Mn, Fe, Co, Ni, Cu, Hg.The purpose of the work: to obtain new CRS ET, where electroconductivity take place not only in the cation-radical chains, but also in anionic system. It is possible due to using of large-scale anions, which has an ability to donor-acceptor interaction such as isopolymolybdates and isopolywolframates. To develop a new effective method of synthesis of complexes of transition metals with isotrithiondithiole (dmit's complexes) because the absence of a method in the cause, that similar complexes, based on Mn, Fe, Co, Cu, Hg hadn't been studied yet. Therefore, a possibility of creation of new synthetic metals and superconductors, based on the other metals, that Ni, Pd and Pt isn't clear yet. Methods: Modern methods of synthesis: IR, UV spectroscopy X-Ray structure analysis, quantum-calculations in relativistic approximation.Obtained data and novelty: Optical and electrophysical properties (both of the constant current and in the millmetric diapason) of monocrystals of octomolybdat of ET of composition (ET)6Mo8O26•3DMF had been investigated at first. The presence of transition such "metal-semimetal" under 180K and transition "semimetal-isolator" under 50K had been altermined by measurement of changing of reflecting spectra on electroresistance. It had been shown, that the last transition disappear under non-high pressure (about 0.25 kbar) - it is irreversible phase transition inducted by pressure in stable metallic state. Because of redox reaction, that takes place under conditions of electrosynthesis between cation-radical ET+ and these anions, it is impossible to obtain the similar CRS. The fact had been shown too the new effective method of synthesis of complexes of Ktn[M(dmit)2], where Kt is arbitrary cation (both, the organic and the inorganic), and M is transition metal. The method consists in reduction of sulphurcarbon by alkali metal in DMF under (-300C), followed by oxidation of obtained solution by iodine, isotrythiondithiol C6S10 with quantative yield is obtained. The reduction of the last by hydrazine in alkali medium give to us an opportunity to synthesis with a quantative yield solution corresponding salts of MX2 or MX3 (where X is a halogen). We can obtain any complex of Ktn[M(dmit)2] composition. The efficiency of the method is illustrated by synthesis of the most important complexes, which contains cations of alkali metals as outspheric, and Mn, Co, Fe, Hg, Cu as central atoms. Product Description popup.authors popup.nrat_date 2020-04-02 Close