Hydrogen adsorption properties of lantern-type dinuclear M(BDC)(DABCO)1/2

The hydrogen adsorption properties and uptake capacities of three-dimensional microporous materials of lantern-type dinuclear NI(BDC)(DABCO)(1/2) (M = Co-II Cu-II and Zn-II; BDC = 1,4-benzenedicarboxylate, DABCO = 1,4-diazabicyclo[2.2.2]octane; Co(BDC)(DABCO)(1/2) (1), Cu(BDC)(DABCO)(1/2) (2), Zn(BDC)(DABCO)(1/2) (3)) were investigated at various temperatures of 77-333K and pressures Lip to 10MPa using a PCT automatic measuring system (Sievert-type apparatus). The results indicated that Uptake to 4. 11 2.70, and 3.17 wt% of hydrogen can be stored oil 1, 2. and 3. respectively, at 77 K. The amounts of hydrogen are adsorbed by all complexes Lit around room temperature (293 K) and high-pressures are much lower (< 0.5 wt%). Adsorption isotherms at around room temperature show a linear uptake relationship: all of them follow the Henry's law. By measuring nitrogen gas adsorption/desorption, all complexes exhibit approximately Type-I isotherms according to the IUPAC classification and possess BET surface areas in the range of 1165 (for 3) to 1595 m(2) g(-1) (for 1). Further, the thermal stability of all complexes is high, in the range of about 500 K (for 3) to 600 K (for 1). These complexes were synthesized and characterized by X-ray powder diffraction pattern, TG/DTA. Fr-IR, surface area analysis, and hydrogen adsorption measurements.