Abstract
Camphenylphosphonic acid RPO3H2, prepared by the literature reaction of PCl5 with camphene, has been characterized by a single-crystal X-ray diffraction study. The compound crystallizes with a double chain structure formed by connected eight-membered hydrogen-bonded rings. Reaction of RPO3H2 with cis-[PtCl2(PPh3)2] and excess silver(I) oxide in refluxing dichloromethane gives the platinum(II) phosphonate complex [Pt{O3PR}(PPh3)2]. 31P{1H} NMR spectroscopic characterization of [Pt{O3PR}(PPh3)2] shows that the two PPh3 ligands are inequivalent due to asymmetry of the camphenyl group. An X-ray diffraction study on the platinum complex shows that the PC–H bond is directed toward the four-membered ring, resulting in the terpene group pointing away from the ring, in contrast to the previously reported structure of the saturated camphanylphosphonate complex. The differences are discussed in terms of steric interactions involving the phosphonate ligands.
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