Triaxially-woven Hydrogen-bonded Chicken Wires of Tetrakis(carboxybiphenyl)ethene Derivative.

An interpenetration manner of low-dimensionally networked structural motifs crucially effects on porosity, stability, and property of the whole reticular framework. To vary and control the manner, however, is still challenging. In this study, we report, for the first time, a porous hydrogen-bonded organic framework (HOF) with wvm topology constructed by triaxially-woven chicken wires of X-shaped tetra-armed carboxylic acid, tetrakis(carboxybiphenyle)ethane derivative CBPE , whose formal name is 4',4''',4''''',4'''''''-(ethene-1,1,2,2-tetrayl)tetrakis([1,1'-biphenyl]-4-carboxylic acid. The structure is a contrast to non-interpenetrated layered framework composed of tetrakis(4-carboxyphenyl)ethene CPE . This exotic framework of CBPE is provided by fine adjustment and disproportionation of conformation of the outer phenylene rings in the peripheral biphenyl arms. The activated framework CBPE-1a exhibits thermal stability up to 220 °C and Brunauer-Emmett-Teller (BET) surface area of 555 m 2 g -1 . Additionally, the HOF shows mechanochromic behavior in terms of fluorescence color and quantum efficiency. The achievement of the present wvm -topological HOFs can provide an insight to construct a new type of functional porous organic materials with interwoven network structures.