Noncovalent Bonding Interactions between Tetraphenylborate Anions and Paraquat and Diquat Dications


  • This work was supported by the Science and Engineering, and Agricultural and Food, Research Councils in the United Kingdom. We thank the Leverhulme Trust for the award of a Research Fellowship to J. F. S.


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A ternary complex—in solution and in the crystal—with π-π charge transfer interactions is formed be the dication paraquat (MeNC5H4[BOND]C5H4NMe) and two tetraphenylborate anions. This involves face-to-face and face-to-edge interactions between pyridinium rings and phenyl rings. Scarcely more than a methyl group of the flat paraquat is discernable in the illustration on the right.