Influence of hydrogen bridges on the magnetic properties of copper(II) bis(trifluoroacetate) complexes

Victor Calvo, Piedad Cortes, Yanko Moreno, Andres Vega, Evgenia Spodine

Resultado de la investigación: Contribución a una revistaArtículo

3 Citas (Scopus)

Resumen

Copper(II) trifluoroacetate with three coordinated water molecules and two dioxane molecules (1) crystallized as a linear chain surrounded by a net of hydrogen bonds to the dioxane and trifluoroacetate. This-complex [Cu(H2O)3 (OOC-CF3) 2]-2(C4H8O2) crystallizes in the triclinic space group P1 with a = 6.067(1)Å, b= 12.153(3)Å, c = 15,057(3)Å, a= 100.09(2), β = 99.15(2), Y= 101.00(2) and Z = 2. The single crystal EPR spectrum of (1) shows to signals (g⊥ = 2.19 and g∥ = 2.39), and a weak multiplet at g = 4.55. The EPR spectrum of complex (1) is interpreted as a weak exchange occurring in the chain structure found by X-ray diffraction. A hydrogen bond occurring between the axial water on one copper and the carboxylate group of a neighbor copper is proposed to transmit the magnetic exchange found by EPR. The magnetic susceptibility of (1) gave a constant value for the magnetic moment of 1.93 B.M. Bis(1,3-diaminopropan-2-ol)bis(trifluoroacetate)copper(ll) complex (2) [Cu(DAP)2(OOC-CF3)2] (DAP=1,3-diamino propan-2-ol) forms a net of hydrogen bonds in the plane of the DAP ligand with adjacent trifluoroacetates. This complex crystallizes in the monoclinic space group P21/c with a = 9.951 (3)Å, b = 8.521 (2) Å, c = 11.224(3)Å, β = 109.83(2) and Z = 2. Complex (2) present a weak magnetic coupling; the magnetic data fits to the Curie-Weiss equation, with θ= 3.86 K and g = 2.1. The effective magnetic moment of (2) decays steadily from 2.01 B.M. at room temperature down to 1.5 B.M. at 6 K.

Idioma originalInglés
Páginas (desde-hasta)259-268
Número de páginas10
PublicaciónBoletin de la Sociedad Chilena de Quimica
Volumen45
N.º2
DOI
EstadoPublicada - 1 ene 2000

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