Even with a large range of complexation conditions CB and DABCO do not form host-guest inclusion complexeshowever, DABCO can form complexes with larger CB . The conclusion was that the cavity of CB and its portals are too small to accommodate this larger molecule. It was proven by Ogoshi and co-workers [23] that DABCO forms host-guest complex with pillar arene but not with pillar arene. Moreover, the ternary complexes, metalloporphyrin-DABCO-metalloporphyrin characterized by NMR spectroscopy and measurement of the magnitude of π-π interactions, was studied by Hunter and co-workers . The encapsulation of DABCO by the endofunctionalized bis-urea/thiourea molecular receptor shows a stronger binding of bis-thiourea macrocycles compared with their urea analogues, and also affects the physicochemical and spectral behavior .