0000000001304103
AUTHOR
C. Zanchini
Guanine-containing copper(ii) complexes: synthesis, X-ray structures and magnetic properties
Three new compounds of formula {[Cu(gua)(H(2)O)(3)](BF(4))(SiF(6))(1/2)}(n) (1), {[Cu(gua)(H(2)O)(3)](CF(3)SO(3))(2).H(2)O}(n) (2) and [Cu(gua)(2)(H(2)O)(HCOO)]ClO(4).H(2)O.1/2HCOOH] (3) [gua = 2-amino-1H-purin-6(9H)-one] showing the unprecedented coordination of neutral guanine, have been synthesised and structurally characterized. The structures of the compounds 1 and 2 contain uniform copper(II) chains of formula [Cu(gua)(H(2)O)(3)](n)(2n+), where the copper atoms are bridged by guanine ligands coordinated via N(3) and N(7). The electroneutrality is achieved by uncoordinated tetrafluoroborate and hexafluorosilicate (1) and triflate (2). Each copper atom in 1 and 2 is five-coordinated in …
Magnetism and EPR spectra of the two‐sublattice manganese chain Mn2(EDTA)⋅9H2O
We report on the magnetic behavior and single‐crystal EPR spectra of the chain complex Mn2(EDTA)⋅9H2O characterized by two different alternating sites for the manganese ions. Magnetic susceptibility data are indicative of weak antiferromagnetic exchange interactions between the manganese ions, showing a maximum of about 3 K. This behavior can be accurately described on the basis of a Heisenberg chain model that assumes classical spins, giving J/k=−0.72 K and g=2.0. The EPR spectra are typically low dimensional, with an angular dependence of the linewidth of the type (3 cos2 θ−1)n (n=4/3 or 2). Nevertheless, such a behavior cannot be reproduced from a one‐dimensional model with dipolar broad…
CCDC 660799: Experimental Crystal Structure Determination
Related Article: T.F.Mastropietro, D.Armentano, E.Grisolia, C.Zanchini, F.Lloret, M.Julve, G.De Munno|2008|Dalton Trans.||514|doi:10.1039/b713960h
CCDC 660801: Experimental Crystal Structure Determination
Related Article: T.F.Mastropietro, D.Armentano, E.Grisolia, C.Zanchini, F.Lloret, M.Julve, G.De Munno|2008|Dalton Trans.||514|doi:10.1039/b713960h
CCDC 660800: Experimental Crystal Structure Determination
Related Article: T.F.Mastropietro, D.Armentano, E.Grisolia, C.Zanchini, F.Lloret, M.Julve, G.De Munno|2008|Dalton Trans.||514|doi:10.1039/b713960h