554408-99-0Relevant academic research and scientific papers
Synthesis and reactivity of a new Fe(II) 5-(4-pyridyl)-tetrazolate complex and X-ray structure of its doubly protonated derivative
Palazzi, Antonio,Stagni, Stefano,Selva, Simona,Monari, Magda
, p. 135 - 140 (2007/10/03)
The synthesis of the new Fe(II) complex [CpFe(CO)2(N4C-C5H4N)] (2) is described. 1H- and 13C-NMR spectroscopy data of (2) indicate the presence of interannular conjugation in the pyridyl-tetrazolate ligand, implying coplanarity between the two rings. Addition of electrophiles to 2 resulted in the formation of cationic complexes such as [CpFe(CO)2(4-MeN4-C5H4N)] [O3SCF3] (3), [CpFe(CO)2 and of the doubly protonated complex [CpFe(CO)2 (4-HN4C-C5H4N-H)][O3SCF 3]2 (5). In all cases, the out-of-plane rotation of the pyridyl ring occurred as a consequence of the quaternization of the N-4 of tetrazole ring. X-ray structure of complex 5 indicates a torsion angle of 20.9(2)° between the aromatic rings. Protonation reactions were found to be reversible and complexes 4-5 were easily converted into the starting complex 2 by addition of a base.
