Complexation of metal salts with macrocyclic polyethers in aprotic organic solvents. Crystal structure of ionic complexes [Co·15-crown-5·2CH3CN][CoCl3·CH3CN]2·CH3CN, [Co·15-crown-5·2CH3CN][CoCl4]·CH3CN and [Co·15-crown-5·2CH3CN][Co2Cl6]
摘要:
Interaction of anhydrous CoCl2 with 15-crown-5 in acetonitrile medium leads to the formation in solution and in the crystal of ionic compounds of three structural types: [Co.15-C-5.2AN][CoCl3.AN]2.AN, [Co.15-C-5.(AN)2][CoCl4].AN and [Co.15-C-5.(AN)2][Co2Cl6]. The complex formation has been studied by conductometric and spectrophotometric titration, but individual compounds by X-ray structural analysis. All three compounds were found to be the intracavital complexes. The cobalt polyhedron is a pentagonal bipyramid, the apical positions being occupied by nitrogens. Thermal decomposition of these compounds starts with the loss of acetonitrile, the final step being the destruction of the polyether ring.