ADDUCTS OF PLATINUM(IV) NITRATE COMPLEXES WITH 15-CROWN-5 ETHER

The possibility of isolating platinum(IV) nitrate complexes to the solid phase from a nitric acid solution of platinum in the form of adducts with dibenzo-18-crown-6, 15-crown-5, and 12-crown-4 ether is studied. It is found that when nitric acid solutions containing 15-crown-5 ether (15-C-5) are evaporated, a polycrystalline product consisting of mainly a mixture of phases with the compositions (H3O subset of 15-C-5)(2)[Pt(NO3)(6)] (1), (H3O subset of 15-C-5)(2)(15-C-5)[Pt(NO3)(6)]center dot 2H(2)O (2), and (15-C-5)[Pt-4(mu(3)-OH)(2)(mu(2)-OH)(4)(NO3)(10)]center dot 3H(2)O (3) is formed. The structure of the mentioned compounds is established by single crystal X-ray diffraction. In the case of dibenzo-18-crown-6 ether, the interaction with a nitric acid solution of platinum results in the formation of a poorly soluble tetranitro derivative of macrocyclic ether. Evaporation of nitric acid solutions of platinum containing 12-crown-4 ether does not allow the preparation of a solid crystalline phase.