RESUMO
The reactions of N-salicylidene-o-aminophenol or its derivatives and excess of nickel(II) acetate in alcohols have led to Ni(II)20 clusters with an unprecedented "bowl" metal topology.
RESUMO
The reactions of Co(II) sources with N-salicylidene-o-aminophenol (H2saph), N-salicylidene-o-amino-4-methylphenol (H2saph-4Me) and N-salicylidene-o-amino-4-chlorophenol (H2saph-4Cl) were studied in MeOH. The new solid complexes (Bu4(n)N)[Co(III)(saph)2] (1), (Et3NH)[Co(III)(saph-4Me)2]â MeOHâ MeCO2H (2â MeOHâ MeCO2H) and (Et3NH)[Co(III)(saph-4Cl)2]â MeOHâ MeCO2H (3â MeOHâ MeCO2H) have been isolated and their structures determined by single-crystal, X-ray crystallography. The three compounds contain the mononuclear, low- spin octahedral anion [Co(III)L2](-) (H2L=H2saph, H2saph-4Me, H2saph-4Cl), in which both L(2)(-) ligands act as tridentate chelating, meridional ONO donors. The crystal structures of 2â MeOHâ MeCO2H and 3â MeOHâ MeCO2H are built through H-bonding and π-π stacking interactions. The new complexes were characterized by elemental analyses and spectroscopic (IR, Raman, UV/VIS, (1)H NMR) data. All data are discussed in terms of the nature of bonding and known structures.
Assuntos
Cobalto/química , Compostos Organometálicos/química , Fenóis/química , Bases de Schiff/química , Cristalografia por Raios X , Espectroscopia de Ressonância Magnética , Conformação Molecular , Estrutura Molecular , Espectrofotometria Ultravioleta , Análise Espectral RamanRESUMO
Three structurally and magnetically different tetranuclear Ni(II) complexes have been isolated and magnetically characterized, emphasizing the effect of the reaction solvent and organic ligand substitution on the chemical identity of cluster compounds.