Uranyl Ion Coordination

Science  12 Jul 1963:
Vol. 141, Issue 3576, pp. 154-158
DOI: 10.1126/science.141.3576.154


A review of the known crystal structures containing the uranyl ion shows that plane-pentagon coordination is equally as prevalent as planesquare or plane-hexagon. It is suggested that puckered-hexagon configurations of OH- or H2O about the uranyl group will tend to revert to plane-pentagon coordination. The concept oft of pentagonal coordination is invoked for possible explanations of the complex crystallography of the natural tiranyl hydroxides and the unusual behavior of polynuclear ions in hydrolyzed uranyl solutions.