The Dimeric Pyramidal Cu 2 O 6 (H 2 O) 2 Unit - A Structural Invariant of a Homologous Series of Copper-Layered Phosphonates - Université de Bretagne Occidentale Access content directly
Journal Articles European Journal of Inorganic Chemistry Year : 2016

The Dimeric Pyramidal Cu 2 O 6 (H 2 O) 2 Unit - A Structural Invariant of a Homologous Series of Copper-Layered Phosphonates

Abstract

Two new layered copper hybrid materials, namely, the copper thiophene-2,5-diphosphonate [Cu2(H2O)2(O3P–C4H2S–PO3)] (Pnma; a = 7.525 Å, b = 18.292 Å, c = 7.520 Å) and the copper 3-fluorophenylphosphonate Cu(H2O)PO3–C6H4F (P21/c; a = 14.305 Å, b = 7.550 Å, c = 7.479 Å, β = 92.32°), have been synthesized. These compounds belong to the large homologous Cu(H2O)PO3R/[Cu2(H2O)2(O3P–R–PO3)] series, the structure of which is dictated by the presence of isolated dimeric pyramidal Cu2O6(H2O)2 units. The role of the Cu/H2O molar ratio of 1 in the stabilization of such a structure is discussed in connection with the Jahn–Teller effect of the copper cation. The study of the magnetic behavior of polycrystalline samples of the two compounds has revealed antiferromagnetic coupling between the copper ions. The interactions within the dimeric unit were estimated by the Bleaney–Bowers law with the spin Hamiltonian H = –JSCu1SCu2 + gβHS: J = –6.27 cm–1 for [Cu(H2O)PO3]2C4H2S, and J = –6.07 cm–1 for Cu(H2O)PO3–C6H4F.

Dates and versions

hal-01539324 , version 1 (14-06-2017)

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Clarisse Bloyet, Mélissa Roger, Jean-Michel Rueff, Bernard Raveau, Jean-François Lohier, et al.. The Dimeric Pyramidal Cu 2 O 6 (H 2 O) 2 Unit - A Structural Invariant of a Homologous Series of Copper-Layered Phosphonates. European Journal of Inorganic Chemistry, 2016, 2016 (28), pp.4643 - 4648. ⟨10.1002/ejic.201600613⟩. ⟨hal-01539324⟩
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