Syntheses, Crystal Structures, and Properties of Three Novel Silver–Organic Frameworks Assembled from 1,2,3,5-Benzenetetracarboxylic Acid Based on Argentophilic Interactions

Abstract

Three novel silver(I) metal–organic coordination polymers constructed from 1,2,3,5-benzenetetracarboxylic acid with different deprotonation degrees, namely, [Ag2(H2btec)(H2O)] (1), [Ag3(Hbtec)] (2), and [Ag4(btec)] (3) (H4btec = 1,2,3,5-benzenetetracarboxylic acid), have been synthesized with hydrothermal methods and characterized by elemental analysis, infrared, thermogravimetric analysis, and single crystal X-ray diffraction. The Ag(I) atoms show versatile coordination sphere in the three different complexes and great supramolecular structure difference demonstrated due to the coordination modes change of the H4btec ligands. Ag(I) dimers bridged by H2btec2– ligands into a three-dimensional framework was observed in complex 1. An unprecedented talon-like Ag(I) hexamer unit was obtained in complex 2, which acts as a building unit that connects with Hbtec3– into (5,10)-connected MoGe2-type framework. A one-dimensional Ag(I) chain built with Ag(I) tetramer units was demonstrated in complex 3, and each btec4...