The crystal structure of the title complex has been determined. The crystals are orthorhombic, space-group Pcan, a= 17·772, b= 9·397, c= 14·324 Å, Z= 4. 886 Intensities above background were measured by counter methods and refined to a final R of 0·037. The crystal contains discrete cations and anions. The lead atom is eight-co-ordinate with approximately hexagonal bipyramidal geometry. The Pb–C(axial) bonds are of normal length, 2·16(3)Å. The equatorial Pb–O bonds are very long, 2·55 Å(mean). The structure is compared with that of the uranyl triacetate anion. The unit cell of the corresponding caesium salt has been determined as cubic, a= 13·21 Å.