title: Unusual ion UO(4)(-) formed upon collision induced dissociation of [UO(2)(NO(3))(3)](-), [UO(2)(ClO(4))(3)](-), [UO(2)(CH(3)COO)(3)](-) ions.
abstract: The following ions [UO(2)(NO(3))(3)](-), [UO(2)(ClO(4))(3)](-), [UO(2)(CH(3)COO)(3)](-) were generated from respective salts (UO(2)(NO(3))(2), UO(2)(ClO(4))(3), UO(2)(CH(3)COO)(2)) by laser desorption/ionization (LDI). Collision induced dissociation of the ions has led, among others, to the formation of UO(4)(-) ion (m/z 302). The undertaken quantum mechanical calculations showed this ion is most likely to possess square planar geometry as suggested by MP2 results or strongly deformed geometry in between tetrahedral and square planar as indicated by DFT results. Interestingly, geometrical parameters and analysis of electron density suggest it is an U(VI) compound, in which oxygen atoms bear unpaired electron and negative charge.
authors.affiliation: Faculty of Chemistry, Adam Mickiewicz University, Poznań, Poland.
authors.forename: Marzena
authors.initials: M
authors.lastname: Sokalska
authors.forename: Małgorzata
authors.initials: M
authors.lastname: Prussakowska
authors.forename: Marcin
authors.initials: M
authors.lastname: Hoffmann
authors.forename: Błazej
authors.initials: B
authors.lastname: Gierczyk
authors.forename: Rafał
authors.initials: R
authors.lastname: Frański