A 16-connected three-dimensional hydrogen-bonding network in tetrakis(4-aminopyridinium) perylene-3,4,9,10-tetracarboxylate octahydrate

摘要

The novel title organic salt, 4C5H7N2 + C24H8O8 4- 8H 2O, was obtained from the reaction of perylene-3,4,9,10- tetracarboxylic acid (H4ptca) with 4-aminopyridine (4-ap). The asymmetric unit contains half a perylene-3,4,9,10-tetracarboxylate (ptca 4-) anion with twofold symmetry, two 4-aminopyridinium (4-Hap +) cations and four water molecules. Strong N-H?O hydrogen bonds connect each ptca4- anion with four 4-Hap+ cations to form a one-dimensional linear chain along the [010] direction, decorated by additional 4-Hap+ cations attached by weak N-H?O hydrogen bonds to the ptca4- anions. Intermolecular O-H?O interactions of water molecules with ptca4- and 4-Hap+ ions complete the three-dimensional hydrogen-bonding network. From the viewpoint of topology, each ptca4- anion acts as a 16-connected node by hydrogen bonding to six 4-Hap+ cations and ten water molecules to yield a highly connected hydrogen-bonding framework. π-π interactions between 4-Hap + cations, and between 4-Hap+ cations and ptca 4- anions, further stabilize the three-dimensional hydrogen-bonding network.