Syntheses, characterization and study of the properties of heterobimetallic compounds containing ferrocenyl units X-ray crystal structure of: [Zn( η5-C 5H 5)Fe[( η5-C 5H 4)-CH=N-CH 2-CH 2-N(CH 3) 2]Cl 2

Abstract

The synthesis, characterization and study of the new ferrocenyl Schiff base: [ η 5-C 5H 5)Fe( η 5-C 5H 4)-CH=N-CH 2-CH 2-N(CH 3) 2] ( 1) is reported. This substrate reacts with Na 2[PdCl 4] or with transition metal dichlorides MCl 2 · nH 2O with M = Zn, Ni, Co or Cu giving the corresponding coordination compounds: [M( η 5-C 5H 5)Fe[( η 5-C 5H 4)-CH=N-CH 2-CH 2-N(CH 3) 2]Cl 2] with M = Pd ( 2), Zn ( 3), Ni ( 4), Co ( 5), and Cu ( 6). These heterobimetallic compounds have been characterized by infrared and UV—visible spectroscopies. NMR-spectroscopic studies on the diamagnetic derivatives ( 1–3) together with magnetochemical studies on the paramagnetic species ( 4–6) are also reported. Crystals of complex 3 have also been characterized by X-ray diffraction: orthorhombic space group Pcab, with a = 12.225(1) Å; b = 14.685(1) Å; c = 19.474(1) Å, and V = 3498.4(4) Å 3. Electrochemical studies, based on cyclic voltammetry, for all the compounds have allowed us to establish the influence of the central atom M(II) upon the redox ability of the Fe(II).