The dihydrobis(3-carboxyethyl-5-methylpyrazolyl)borate ligand, Bp(COOET,Me), reacts with divalent metals to yield complexes of general type [(Bp(COOET,Me))(2)M], where M = Mn(II), Fe(II), Co(II), Ni(II), Zn(II), Cu(II), Pb(II) and Cd(II). All complexes have been fully characterized by elemental analyses and FT-IR in the solid state and by NMR (H-1 and Cd-113 NMR) spectroscopy and electrospray ionization mass spectrometry in solution. A single crystal structural characterization is reported for [Cu(Bp(COOET,Me))(2)] and [Zn(Bp(COOET,Me))(2)]. In the two complexes, both metals are four-coordinated and they are only bound to the nitrogen atoms of the bis(pyrazolyl)borate ligand; however, while the environment of the copper atom is square planar, that of the zinc center shows a tetrahedral distorted conformation.
Synthesis and characterization of divalent metal complexes containing the heteroscorplonate ligand dihydrobis(3-carboxyethyl-5-methylpyrazolyl)borate
PELLEI, Maura;SANTINI, Carlo
2006-01-01
Abstract
The dihydrobis(3-carboxyethyl-5-methylpyrazolyl)borate ligand, Bp(COOET,Me), reacts with divalent metals to yield complexes of general type [(Bp(COOET,Me))(2)M], where M = Mn(II), Fe(II), Co(II), Ni(II), Zn(II), Cu(II), Pb(II) and Cd(II). All complexes have been fully characterized by elemental analyses and FT-IR in the solid state and by NMR (H-1 and Cd-113 NMR) spectroscopy and electrospray ionization mass spectrometry in solution. A single crystal structural characterization is reported for [Cu(Bp(COOET,Me))(2)] and [Zn(Bp(COOET,Me))(2)]. In the two complexes, both metals are four-coordinated and they are only bound to the nitrogen atoms of the bis(pyrazolyl)borate ligand; however, while the environment of the copper atom is square planar, that of the zinc center shows a tetrahedral distorted conformation.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
