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: Article

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

Huella dactilar

Trifluoroacetic Acid
Copper
Hydrogen
Magnetic properties
Paramagnetic resonance
Hydrogen bonds
Magnetic moments
Magnetic couplings
Molecules
Water
Magnetic susceptibility
Single crystals
Ligands
X ray diffraction
Temperature
1,4-dioxane

ASJC Scopus subject areas

  • Chemistry(all)

Citar esto

Calvo, Victor ; Cortes, Piedad ; Moreno, Yanko ; Vega, Andres ; Spodine, Evgenia. / Influence of hydrogen bridges on the magnetic properties of copper(II) bis(trifluoroacetate) complexes. En: Boletin de la Sociedad Chilena de Quimica. 2000 ; Vol. 45, N.º 2. pp. 259-268.
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title = "Influence of hydrogen bridges on the magnetic properties of copper(II) bis(trifluoroacetate) complexes",
abstract = "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){\AA}, b= 12.153(3){\AA}, c = 15,057(3){\AA}, 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){\AA}, b = 8.521 (2) {\AA}, c = 11.224(3){\AA}, 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.",
keywords = "Copper(II), Hydrogen bonding, Magnetic exchange, Trifluoroacetate",
author = "Victor Calvo and Piedad Cortes and Yanko Moreno and Andres Vega and Evgenia Spodine",
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Influence of hydrogen bridges on the magnetic properties of copper(II) bis(trifluoroacetate) complexes. / Calvo, Victor; Cortes, Piedad; Moreno, Yanko; Vega, Andres; Spodine, Evgenia.

En: Boletin de la Sociedad Chilena de Quimica, Vol. 45, N.º 2, 01.01.2000, p. 259-268.

Resultado de la investigación: Article

TY - JOUR

T1 - Influence of hydrogen bridges on the magnetic properties of copper(II) bis(trifluoroacetate) complexes

AU - Calvo, Victor

AU - Cortes, Piedad

AU - Moreno, Yanko

AU - Vega, Andres

AU - Spodine, Evgenia

PY - 2000/1/1

Y1 - 2000/1/1

N2 - 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.

AB - 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.

KW - Copper(II)

KW - Hydrogen bonding

KW - Magnetic exchange

KW - Trifluoroacetate

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U2 - 10.4067/S0366-16442000000200013

DO - 10.4067/S0366-16442000000200013

M3 - Article

AN - SCOPUS:33749568584

VL - 45

SP - 259

EP - 268

JO - Journal of the Chilean Chemical Society

JF - Journal of the Chilean Chemical Society

SN - 0717-9324

IS - 2

ER -