The compartmental Schiff base H(2)-L, obtained by [2 + 1] condensation of 3-methoxy-2-hydroxybenzaidehyde and 1,5-diamino-3-azapentane, and the related mono- and hetero-polynuclear copper(II), zinc(II) and lanthanum(III) complexes have been prepared and their physico-chemical properties studied by IR, NMR, SEM-EDS and X-ray single crystal diffractometry. In the mononuclear complexes [M(L)] center dot nS (M = Cu(II), Zn(II), S = H(2)O, MeOH), obtained in alcoholic solution by the reaction of the free ligand and the appropriate metal acetate hydrate or nitrate or by [2 + 1] condensation of the formyl- and polyamine-derivatives in the presence of the desired metal salt, [L](2-) coordinates to the metal ion in the diimine form as ascertained by the 1 H NMR spectra of the zinc(II) complex. The hetero-dinuclear complexes have been prepared by the reaction of the copper(H) or zinc(II) mononuclear complex with La(NO(3))(3)center dot 6H(2)O in 1:1 molar ratio. The copper-lanthanum complex is not a true heterodinuclear complex, as it can be described as {[Cu(2)(H(2)L)(2)](2)[La(NO(3))(6)](NO(3))}, while heterodinuclear complexation occurs in {[ZnLa(H-L')(NO(3))(3)(S)](NO(3))) (S = H(2)O or C(2)H(5)OH), where a ring contraction at one imine group takes place, with the formation of a five-membered heterocyclic imidazolidine ring.

Mononuclear and polynuclear complexes with a side-off compartmental Schiff base

DI BERNARDO, PLINIO;ZANONATO, PIER LUIGI
2008

Abstract

The compartmental Schiff base H(2)-L, obtained by [2 + 1] condensation of 3-methoxy-2-hydroxybenzaidehyde and 1,5-diamino-3-azapentane, and the related mono- and hetero-polynuclear copper(II), zinc(II) and lanthanum(III) complexes have been prepared and their physico-chemical properties studied by IR, NMR, SEM-EDS and X-ray single crystal diffractometry. In the mononuclear complexes [M(L)] center dot nS (M = Cu(II), Zn(II), S = H(2)O, MeOH), obtained in alcoholic solution by the reaction of the free ligand and the appropriate metal acetate hydrate or nitrate or by [2 + 1] condensation of the formyl- and polyamine-derivatives in the presence of the desired metal salt, [L](2-) coordinates to the metal ion in the diimine form as ascertained by the 1 H NMR spectra of the zinc(II) complex. The hetero-dinuclear complexes have been prepared by the reaction of the copper(H) or zinc(II) mononuclear complex with La(NO(3))(3)center dot 6H(2)O in 1:1 molar ratio. The copper-lanthanum complex is not a true heterodinuclear complex, as it can be described as {[Cu(2)(H(2)L)(2)](2)[La(NO(3))(6)](NO(3))}, while heterodinuclear complexation occurs in {[ZnLa(H-L')(NO(3))(3)(S)](NO(3))) (S = H(2)O or C(2)H(5)OH), where a ring contraction at one imine group takes place, with the formation of a five-membered heterocyclic imidazolidine ring.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/2440973
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