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 [H6L][(PA)(HPA)]2·(H2O)10, 1·(H2O)10 (PA2- = phthalate anion, L = N[(CH2)2NHCH2(C6H4-p)CH2NH(CH2)2]3N). Formations of eight additional
hydrogen bonds between the decameric water ring and the adjacent PA2- and HPA- anions make the water ring stable at room temperature.
Structural refinement using low-temperature collected data gave an approximate composition of 1·(H2O)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.