studies of bisporphyrin 1 with a variety of electron deficient aromatic guests 9−17 were carried out in chloroform. Soret and Q-bands of 1 showed the characteristic changes with the addition of guests 9−13 and 15, and large upfield shifts of their protons were observed in their complexation studies with 1H NMR spectroscopy. These results suggested that the electron deficient aromatic guests bound within