Journal
LANGMUIR
Volume 25, Issue 1, Pages 503-508Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la803014k
Keywords
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Funding
- Office of Science, U.S. Department of Energy [DE-FG02-01ER15244, DE-FG02-99ER14999]
- Argonne National Laboratory
- U.S. Department of Energy (DOE) [DE-FG02-99ER14999] Funding Source: U.S. Department of Energy (DOE)
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A permanently microporous metal-organic framework compound with the formula Zn-2(NDC)(2)(diPyTz) (NDC = 2,6-naphthalenedicarboxylate, diPyTz = di-3,6-(4-pyridyl)-1,2,4,5-tetrazine) has been synthesized. The compound, which features a triply catenating, pillared-paddlewheel structure, was designed to be easily chemically reduced (diPyTz sites) by appropriate channel permeants. Reduction was achieved by using the naphthalenide anion, with the accompanying metal cation (Li+, Na+ or K+) serving to dope the compound in extraframework fashion. H, uptake at 1 atm and 77 K increases from 1.12 wt % for the neutral material to 1.45, 1.60, and 1.51 wt % for the Li+-, Na+-, and K+-doped materials, respectively. The isosteric heats of adsorption are similar for all four versions of the material despite the large uptake enhancements for the reduced versions. Nitrogen isotherms were also measured in order to provide insight into the mechanisms of uptake enhancement. The primary mechanism is believed to be dopant-facilitated displacement of catenated frameworks by sorbed H-2. More extensive cation doping decreases the H-2 loading.
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