Formation of a Decameric Water Ring in a Cryptand−Phthalic Acid Supramolecular Adduct

A well-resolved decameric water ring was formed in the cryptand−phthalic acid supramolecular adduct of [H 6 L][(PA)(HPA)] 2 ·(H 2 O) 10, 1 ·(H 2 O) 10 (PA 2- = phthalate anion, L = N[(CH 2 ) 2 NHCH 2 (C 6 H 4 - p )CH 2 NH(CH 2 ) 2 ] 3 N). Formations of eight additional hydrogen bonds between the decameric water ring and the adjacent PA 2- and HPA - anions make the water ring stable at room temperature. Structural refinement using low-temperature collected data gave an approximate composition of 1 ·(H 2 O) 10.67, in which an extra tetrameric water ring was formed and the tetrameric water rings alternately connect the decameric water rings via sharing the apical O(12) atoms to generate a novel one-dimensional water chain.