Issue 26, 2006

Dinuclear and layered copper 2-pyridylphosphonates with weak ferromagnetism observed in layer compound Cu(C5H4NPO3)

Abstract

This paper reports the syntheses and structures of three new copper phosphonates based on 2-pyridylphosphonate, namely, Cu(C5H4NPO3H)2 (1), Cu3(OH)2(C5H4NPO3)2·2H2O (2) and Cu(C5H4NPO3) (3). Compound 1 has a discrete dimeric structure in which the {CuO4N} square pyramids are linked by the {CPO3} tetrahedra through corner-sharing. The dimers are further connected into a chain through hydrogen bonds. In compound 2, edge-sharing {Cu(1)O4N} square pyramids and {Cu(2)O4} planes are found to form an infinite chain with composition {Cu3(µ-OH)2(µ-O)4}. Neighboring chains are linked by the phosphonate groups of the 2-pyridylphosphonate ligands, resulting in inorganic layers containing 4-, 8- and 12-membered rings. The pyridyl groups and the lattice water molecules occupy the inter-layer space. In compound 3, the {Cu(1)O4} and {Cu(2)O2N2} planes are each corner-shared with the {CPO3} tetrahedra, forming an inorganic layer containing 8- and 16-membered rings. The pyridyl groups reside between the layers. Crystal data for 1: space group P[1 with combining macron], a = 8.4045(19), b = 8.751(2), c = 10.632(2) Å, α = 66.673(4), β = 72.566(4), γ = 70.690(4)°, V = 664.7(2) Å3, Z = 2. Crystal data for 2: space group P21/c, a = 7.9544(17), b = 21.579(4), c = 5.0243(10) Å, β = 105.332(3)°, V = 831.7(3) Å3, Z = 2. Crystal data for 3: space group P21/c, a = 4.7793(11), b = 15.319(3), c = 8.6022(19) Å, β = 97.156(4)°, V = 624.9(2) Å3, Z = 4. Magnetic measurements reveal that dominant antiferromagnetic interactions are propagated between the copper centers in compounds 1–3. For 3, spin canting is observed with a ferromagnetic transition occurring at 9 K.

Graphical abstract: Dinuclear and layered copper 2-pyridylphosphonates with weak ferromagnetism observed in layer compound Cu(C5H4NPO3)

Supplementary files

Article information

Article type
Paper
Submitted
07 Dec 2005
Accepted
29 Mar 2006
First published
07 Apr 2006

Dalton Trans., 2006, 3228-3235

Dinuclear and layered copper 2-pyridylphosphonates with weak ferromagnetism observed in layer compound Cu(C5H4NPO3)

Y. Ma, Y. Song, W. Du, Y. Li and L. Zheng, Dalton Trans., 2006, 3228 DOI: 10.1039/B517311F

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