Title

Magnetic-Properties And Molecular-Structure Of Copper(Ii) Complexes Of 2,3-Pyrazinedicarboxamide

Comments

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Keywords

Chemistry; Inorganic & Nuclear

Abstract

The synthesis, crystal structures, and magnetic properties of several copper(II) complexes of 2,3-pyrazinedicarboxamide [L = C4H2N2(CONH2)2] are reported. The crystal structures of CuL2(OH)2· 2H2O and [CuLCl2]2 were determined from single crystal x-ray diffraction using counter methods, and the magnetic susceptibility of these complexes plus the complex CuL2(ClO4)2 were studied over the temperature range 6–300 K. CuL2(OH)2·2H2O crystallizes as a monomeric complex with hydrogen bonding between the uncoordinated water molecules and the pyrazine carboxamide groups. [CuLCl2]2 crystallizes as a dimeric complex with an inversion center. The CuLCl2 coordination sphere is square planar. The dimer is formed by two bridging chlorines to form a five coordinate copper(II) unit. The magnetic properties of CuL2(OH)2·2H2O and CuL2(H2O)2 are consistent with simple Curie Law. The magnetic susceptibility for the chlorine bridged dimer [CuLCl2]2 exhibits antiferromagnetic coupling (g = 2.11, J = −11.5 cm−1). Crystal data for CuL2(OH)2·2H2O: space group P21/c, a = 9.733(1), b = 7.928(2), c = 14.848(2) Å, β = 123.51(1)°, z = 2, dcalc = 1.76 g/cm3, dobs = 1.78 ± 0.1 g/cm3, R = 0.079 for 1125 reflections; crystal data for [CuLCl2]2: space group P21/c, a = 6.327(1) Å, b = 19.910(5) Å, c = 7.572(2) Å, β = 95.86(2)°, z = 2, dcalc = 2.10 g/cm3, dobs = 2.10 ± 0.01 g/cm3, R = 0.056 for 840 reflections.

Journal Title

Inorganica Chimica Acta-Articles

Volume

70

Issue/Number

2

Publication Date

1-1-1983

Document Type

Article

Language

English

First Page

151

Last Page

158

WOS Identifier

WOS:A1983QJ88600005

ISSN

0020-1693

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