A new isomer of the oxozirconium cluster Zr4O2(methacrylate)12 was obtained by reaction of zirconium butoxide with an excess of methacrylic acid. Contrary to the known isomer, the structure is centrosymmetric with a planar, rhombic Zr4 core. Copolymerization with a 56–207‐fold excess of methylmethacrylate results in cluster‐crosslinked poly(methylmethacrylate) that swells in ethyl acetate but does not dissolve. The solvent uptake during swelling decreases and the thermal stability improves with an increasing portion of the cluster. Copyright© 2001 John Wiley & Sons, Ltd.
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Trimmel et al. (2001) studied this question.
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