Anion sensing 'venus flytrap' hosts: a modular approach.

A series of podands based on three hydrogen bonding 'arms' have been prepared and their affinities for simple inorganic anions measured.

Cooperative anion binding and electrochemical sensing by modular podands.

A series of podands based on two or three hydrogen bonding "arms" situated in mutually ortho, meta, or para relationships about an aryl core have been prepared, and their affinities for simple inorganic anions were measured. Of the two-arm hosts the meta compound and to a lesser extent the ortho host exhibit a cooperative anion binding effect. The two arms function essentially independently in the para derivative.