文摘
Shape-persistent iso-C16-cyclo[6]aramide (1) was found to form a charge-transfer (CT) complex with aromatic carbonium tropylium (Tr+). The resulting CT complex was evidenced by both experimental results and theoretical calculations. Particularly, dibutylammonium salt with PF6鈥?/sup> as the counterion can extrude Tr+ from the CT complex, but it cannot do so with Cl鈥?/sup>, thereby offering a visual approach to identify organic intimate ion pairs and loose ion pairs.