X-Ray crystal structure of [HSm{V~(IV)O(TPPS)}]_n and encapsulation of nitrogen molecules in 1-D channels

摘要

The crystal structure of an N_2-encapusulated MOF, which is stable under open-air conditions at ambient temperature, was determined by single-crystal X-ray diffraction at 123 K. The crystal MOF of [HSm{V ~(IV)O(TPPS)}]_n designed to have 1-D channels periodically constricted by porphyrins planes adsorbed N_2 at 77 K. The adsorbed N_2 molecules remained in the 1-D channels even after warming to ambient temperature. The single-crystal structure of [HSm{V~(IV)O(TPPS)} ]_n?N_2 determined by X-ray diffraction indicated that N_2 molecules trapped in the constricted parts block other N _2 molecules in 1-D channels from escaping from the MOF. Such a unique encapsulation mode provides a promising approach toward designing novel MOFs with high gas storage capacity at ambient temperature.