Assembly of 1-D and decanuclear cage compounds from copper halide, cyclohexenephosphonic acid, and 3-(2-pyridyl)pyrazole

The reactions of cyclohexenephosphonic acid (C₆H₉PO₃H₂) and 3-(2-pyridyl)pyrazole (2-pyPzH) with copper(II) chloride and copper(II) bromide affords a 1-D compound [Cu(2-pyPz)Cl] (1) and a decanuclear [Cu₁₀(OH)₄(C₆H₉PO₃)₆(2-pyPz)₄] (2) cage complex. In 1, adjacent copper ions are bridged by two 2-pyPz ligands into dimers, which are further linked by Cl⁻ into a ladder-like chain. Compound 2 has a decanuclear cage structure, the overall cage can be viewed as composed of two Cu₄(OH)₂(2-pyPz)₂ wings that are bridged by a central Cu₂P₂O₆ rim. Variable-temperature magnetic susceptibility studies indicate that both compounds show antiferromagnetic interactions between copper centers.