Copper Carboxylate-phosphonates: Syntheses, Crystal Structures and Magnetic Properties

Two novel copper carboxyly-phosphonates, namely, Cu-2.5(5-pnc)(SO4)(0.5)(OH)(H2O)(0.5) (1) and Cu-0.5(5-pncH(2))(H2O)(1.5) (2) (5-pncH(3) = 5-phosphono-l-naphthalenecarboxylic acid), have been synthesized and characterized by X-ray diffraction, infrared spectroscopy, elemental analysis, and thermogravimetric analysis. In compound 1, each {PO3C} tetrahedron is corner-shared with two {Cu(1)O-4}, two {Cu(2)O-5} and one {Cu(3)O-5}, thus forming a one-dimensional inorganic chain along the c axis containing 8-membered rings of [Cu3O4S] and 19 -membered cages of [Cu5O10P4]. The inorganic chains are further connected by a 5-pnc(3-) ligand to generate a three-dimensional framework. Compound 2 exhibits a one-dimensional structure, in which the inorganic chains of [Cu-O-Cu](n) are connected by the organic ligands through hydrogen bonding interactions, forming an infinite two-dimensional layer. Magnetic measurements of 1 indicate that dominant antiferromagnetic interactions are mediated between the Cu2+ centers.

Automated summary

Two novel copper carboxyly-phosphonates were synthesized and characterized. Compound 1 forms a one-dimensional inorganic chain containing [Cu3O4S] rings and [Cu5O10P4] cages, while compound 2 exhibits a one-dimensional structure with an infinite two-dimensional layer. Magnetic measurements of compound 1 show dominant antiferromagnetic interactions between Cu2+ centers.