Abstract
By the X-ray diffraction method it has been established that the polyhedron of the aquo-dioxalate-uranylate ion [UO 2(C 2O 4) 2(OH 2)] 2− is a pentagonal bipyramid in which two oxalate groups close five-membered cycles. The pentacoordination of the uranyl group is also preserved in the complexes (CN 3H 6) 3[UO 2(C 2O 4) 2F] and K(CN 3H 6) 2[UO 2(C 2O 4) 2(NCS)]2H 2O. The replacement of the aquo-group in the aquodioxalateuranylate ion by hydroxylaminate, N-methylhydroxylaminate and acetoxymate groups results in the formation of hexacoordinated compounds. (NH 4) 3[UO 2(C 2O 4) 2(NH 2O)]H 2O, (NH 4)(CN 3H 6) 2[UO 2(C 2O 4) 2(CH 3NHO)]H 2O, (CN 3H 6) 3-[UO 2(C 2O 4) 2(CH 3) 2]2H 2O. It has been proved that in these compounds hydroxylamine, N-Methylhydroxylamine and acetoxyme are coordinated by the uranyl ion through the nitrogen and oxygen atoms forming a three-membered metallocycle as a result.
Published Version
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