Abstract
The title compound, CuII(1,4-C4H4N2)(C4O4)(OH2)4, was synthesized at room temperature using a silica gel medium to grow single crystals that have been analyzed by X-ray diffraction. It crystallizes in the monoclinic space group P21/n, with a = 6.887(3) Å, b = 11.141(4) Å, c = 7.545(3) Å, β = 90.68(3)°, V = 578.9(4) Å3, Z = 2, and R (Rw) = 0.0263 (0.0393). The structure is composed of a linear chain of CuII(1,4-C4H4N2)(OH2)4 that is closely hydrogen bonded to squarate anions which link the chains together in a 3-D framework. This material was found to be insoluble in most common solvents; thus it was difficult to obtain large crystals without employing the gel as a diffusion medium. This method might serve as a route to accessing new crystalline solids that are constructed from soluble molecular building blocks.
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