title: New mu-oxo octanuclear complexes of 3d elements stabilized by dialkylcarbamato ligands. Synthesis and X-ray crystal and molecular structures.
abstract: The octanuclear aggregates M(8)(mu(4)-O)(2)(O(2)CN(i)()Pr(2))(12) [M = Mn(II) 1, Co(II) 2, Ni(II) 3] have been prepared in good yields by controlled hydrolysis of the corresponding metal carbamate precursors [M(O(2)CN(i)()Pr(2))(2)](n)(). X-ray analysis has shown compounds 1-3 to be isostructural. The core of 2 contains two distorted [M(4)O] tetrahedra related by an inversion center. The hexanuclear carbamates M(6)(O(2)CNEt(2))(12) in toluene undergo a metal redistribution process with formation of the hexanuclear carbamates M'(x)M' '(6-x)(O(2)CNEt(2))(12), M' = Co, M' ' = Mn, as evidenced by mass-spectrometric data. In the presence of moisture, the mixed octanuclear carbamates Co(x)Mn(6-x)(MnO)(CoO)(O(2)CNEt(2))(12) were promptly formed and detected by DCI/MS measurements. Mass spectral data of Co(8)(mu(4)-O)(2)(O(2)CN(i)Pr(2))(12) are also reported.
authors.affiliation: Dipartimento di Chimica e Chimica Industriale, Università di Pisa, via del Risorgimento 35, I-56126 Pisa, Italy.
authors.forename: Daniela
authors.initials: D
authors.lastname: Belli Dell'Amico
authors.forename: Consuelo
authors.initials: C
authors.lastname: Bradicich
authors.forename: Fausto
authors.initials: F
authors.lastname: Calderazzo
authors.forename: Alessandro
authors.initials: A
authors.lastname: Guarini
authors.forename: Luca
authors.initials: L
authors.lastname: Labella
authors.forename: Fabio
authors.initials: F
authors.lastname: Marchetti
authors.forename: Alessandra
authors.initials: A
authors.lastname: Tomei