From Molecular Flat Tapers, Discs, and Cones to Supramolecular Cylinders and Spheres using Fréchet-Type Monodendrons Modified on their Periphery Financial support by the National Science Foundation (DMR-97-08581), the British Engineering and Physical Science Research Council (UK), and the Synchrotron Radiation Source at Daresbury (UK) is gratefully acknowledged.
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Roy and Diana Vagelos Laboratories Department of Chemistry University of Pennsylvania Philadelphia, PA 19104-6323 (USA).
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