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Zawartość zarchiwizowana w dniu 2022-12-23

Synthesis, structure and stereochemical non-rigidity of organotellurium compounds with the intramolecular coordination of the hypervalent type. Their use in the synthesis of novel heterocycles and metal coordination compounds

Cel

By using approaches previously developed by the Rostov-on-Don team a systematic series of b-tellurovinylcarbonyl compounds and their aza-derivatives will be synthesized and their molecular and crystal structure studied with the aid of X-ray crystallography, Mössbauer and 1H, 13C, 15N, 125Te NMR spectroscopy. The objectives of this study is elucidation of the influence of various factors (origin of the donor centres, substituents at the tellurium centre and oths.) on the length and strength of the intramolecular coordination O(N)(r)Te bonds. The results will be interpreted based on precision X-ray determination of distribution of the electron density within the coordination site and high level ab initio calculations. Dynamic 1H and 13C NMR technique will be applied for investigation into kinetics and mechanism of fluxionality of imines bis(2-formylcyclohexen-1-yl)telluride.
Tellurium containing heterocyclic compounds related to previously undescribed heterocyclic system of 2,3-dihydrotellurophene-3-ones will be prepared by using methodology developed for similar chalcogen (S, Se)-containing compounds and methods specific for organotellurium chemistry. Novel derivatives of telluropyrones-2 and telluropyrones-4 and telluropyrylium salts will be prepared and their synthetic potential studied. Reactions of nucleophilic substitution of chlorine in b-cholorovinylaldehydes by aminophenyltellurolate anions or nucleophilic addition of the latter to a-acetylenic aldehydes followed up by cyclization of the formed tellurides will give rise to telluroazepines. Thermal extrusion of tellurium from telluroazepines is a new approach to quinolines.
Synthesis of previously unknown five- and six-membered metal chelate compounds with the MN2Te2 (M=Zn, Cd, Ni, Cu, Pt, Pd) coordination site will be performed based on imines of bis(2-aminophenyl)- and bis(2-formylvinyl)ditellurides as starting material for ligand preparation. The structure, conformational equilibriy and magnetic properties of the metal complexes will be studied and their potential as the starting material for MOCVD preparation of important metal telluride alloys investigated.

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Koordynator

Open University
Wkład UE
Brak danych
Adres
Walton Hall
MK7 6AA Milton Keynes
Zjednoczone Królestwo

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Koszt całkowity
Brak danych

Uczestnicy (4)