CRYSTAL STRUCTURE OF A HYDROXO-BRIDGED DIMERIC URANYL COMPLEX WITH A 2,2′:6′,2-TERPYRIDINE LIGAND

A new dimeric compound [{UO2(mu-OH)(terpy)}(2)](ClO4)(2)center dot 0.67CH(3)CN, containing an uranyl cation and a tridentate 2,2':6',2 ''-terpyridine (terpy) ligand, is synthesized from an acetonitrile solution of uranyl perchlorate and terpy. The crystal structure of the compound is determined by single crystal X-ray diffraction. The crystal structure shows the formation of symmetric and asymmetric cationic hydroxo-bridged uranyl dimers. The uranium atoms adopt a distorted pentagonal bipyramidal configuration with a UO4N3 coordination environment formed by two uranyl O atoms, three N atoms from the terpy ligand, and two O atoms from the hydroxide anions.