The ligand 1,2,3,4-tetramethyl-5-(2-pyridyl)cyclopentadiene (cp*py) forms a dinuclear complex with U(IV), i.e. di-mu-oxo-bis[chloro(diethyl ether-kappaO)[(eta5,kappaN)-1,2,3,4-tetramethyl-5-(2-pyridyl)cyclopentadienyl]uranium(IV)], [U2Cl2O2(C14H16N)2(C4H10O)2], in which cp*py acts as a chelating ligand, being bound to the metal atom by the cyclopentadienyl unit and also by the N atom of the pyridyl ring.