Binding of Linear Anions and Formation of Anion Encapsulated Dimeric Capsular Assembly by Cis‐5,15‐bis(3,5‐trifluoromethylphenyl)calix[4]pyrrole

Abstract

AbstractCis‐5,15‐bis(3,5‐trifluoromethylphenyl)calix[4]pyrrole (1) forms stable 1/1 complexes with linear anions such as N3−, SCN− and NCO‐ with the highest affinity for NCO− anion in acetonitrile solution. Crystallization of receptor 1 with TBASCN and (TMA)2SO4 resulted in the formation of dimeric capsular assembly, {(TMA)2[12 ⋅ (SCN)2]}, in which two thiocyanate anions are encapsulated. On the other hand, 1 ⋅ OCN(TMA) and 1 ⋅ N3(TMA) complexes form one dimensional columnar structure in the solid state.