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Porphyrin-based molecular tweezers as a receptor for bipyridinium guests

✍ Scribed by Maxwell J. Gunter; Martin R. Johnston

Publisher: Elsevier Science
Year: 1992
Tongue: French
Weight: 310 KB
Volume: 33
Category: Article
ISSN: 0040-4039
DOI: 10.1016/s0040-4039(00)91729-5

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✦ Synopsis

A porphyrin with two appended benzo-crown ethers in the form of a porphyrin-based molecular hveezer was synthesised and shown to bind the bipyridinium guests paraquat. diquat and Pt(bpy)(NH& dications in several solvents. The conformations of the host molecule were shown to be solvent dependent. Lack of binding by a noncrown ether containing analogue demonstrated the necessity of the crown ether chains for the binding of guest molecules

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## Abstract Four novel molecular tweezers, **6**–**9**, have been synthesized having, for the first time, three fused __Tröger__'s bases. The compounds differ in the relative configuration of the three fused methylene bridges and have been unambiguously characterized by NMR.