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  • Capture of nerve agents and mustard gas analogues by hydrophobic robust MOF-5 type metal-organic frameworks.

Capture of nerve agents and mustard gas analogues by hydrophobic robust MOF-5 type metal-organic frameworks.

Journal of the American Chemical Society (2011-07-19)
Carmen Montoro, Fátima Linares, Elsa Quartapelle Procopio, Irena Senkovska, Stefan Kaskel, Simona Galli, Norberto Masciocchi, Elisa Barea, Jorge A R Navarro
ABSTRACT

In this communication, a series of observations and data analyses coherently confirms the suitability of the novel metal-organic framework (MOF) [Zn(4)(μ(4)-O)(μ(4)-4-carboxy-3,5-dimethyl-4-carboxy-pyrazolato)(3)] (1) in the capture of harmful volatile organic compounds (VOCs). It is worthy of attention that 1, whose crystal structure resembles that of MOF-5, exhibits remarkable thermal, mechanical, and chemical stability, as required if practical applications are sought. In addition, it selectively captures harmful VOCs (including models of Sarin and mustard gas, which are chemical warfare agents), even in competition with ambient moisture (i.e., under conditions mimicking operative ones). The results can be rationalized on the basis of Henry constant and adsorption heat values for the different essayed adsorbates as well as H(2)O/VOC partition coefficients as obtained from variable-temperature reverse gas chromatography experiments. To further strengthen the importance of 1, its performance in the capture of harmful VOCs has been compared with those of well-known materials, namely, a MOF with coordinatively unsaturated metal sites, [Cu(3)(btc)(2)] and the molecular sieve active carbon Carboxen. The results of this comparison show that coordinatively unsaturated metal sites (preferential guest-binding sites) are ineffective for the capture of VOCs in the presence of ambient moisture. Consequently, we propose that the driving force of the VOC-MOF recognition process is mainly dictated by pore size and surface hydrophobicity.

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SPME fiber assembly Divinylbenzene/Carboxen/Polydimethylsiloxane (DVB/CAR/PDMS), needle size 24 ga, for use with manual holder
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SPME fiber assembly Divinylbenzene/Carboxen/Polydimethylsiloxane (DVB/CAR/PDMS), needle size 23 ga, StableFlex, for use with autosampler
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SPME fiber assembly Divinylbenzene/Carboxen/Polydimethylsiloxane (DVB/CAR/PDMS), needle size 23 ga, StableFlex, for use with manual holder or autosampler, fiber L 2 cm
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SPME fiber assembly Divinylbenzene/Carboxen/Polydimethylsiloxane (DVB/CAR/PDMS), needle size 24 ga, StableFlex
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SPME fiber assembly Divinylbenzene/Carboxen/Polydimethylsiloxane (DVB/CAR/PDMS), needle size 24 ga, StableFlex, for use with autosampler
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SPME fiber assembly Carboxen/Polydimethylsiloxane (CAR/PDMS), df 75 μm(CAR/PDMS, for use with manual holder, needle size 24 ga
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SPME fiber assembly Carboxen/Polydimethylsiloxane (CAR/PDMS), df 75 μm(CAR/PDMS, needle size 23 ga, for use with autosampler
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SPME fiber assembly Carboxen/Polydimethylsiloxane (CAR/PDMS), df 85 μm(CAR/PDMS, needle size 24 ga, StableFlex, for use with autosampler
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Carboxen® Adsorbent, matrix Carboxen® 1000, 40-60 mesh, bottle of 50 g
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Carboxen®-1006 PLOT Capillary GC Column, L × I.D. 30 m × 0.53 mm, average thickness 30 μm
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SPME fiber assembly Carboxen/Polydimethylsiloxane (CAR/PDMS), df 75 μm(CAR/PDMS, needle size 24 ga, for use with autosampler
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SPME fiber assembly Carboxen/Polydimethylsiloxane (CAR/PDMS), df 85 μm(CAR/PDMS, needle size 24 ga, for use with manual holder, StableFlex fiber
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SPME fiber assembly Carboxen/Polydimethylsiloxane (CAR/PDMS), df 75 μm(CAR/PDMS, needle size 23 ga, for use with manual holder
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Carboxen®-1006 PLOT Capillary GC Column, L × I.D. 30 m × 0.32 mm, average thickness 15 μm
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Carboxen® Adsorbent, matrix Carboxen® 564, 20-45 mesh, pack of 144 × 290 mg
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Carboxen® Adsorbent, matrix Carboxen® 572, 20-45 mesh, bottle of 10 g
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Carboxen® Adsorbent, matrix Carboxen® 1003, 40-60 mesh, bottle of 10 g
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Carboxen®-1010 PLOT Capillary GC Column, L × I.D. 30 m × 0.53 mm, average thickness 30 μm
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Carboxen® Adsorbent, matrix Carboxen® 563, 20-45 mesh, bottle of 10 g
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SPME fiber assembly Divinylbenzene/Carboxen/Polydimethylsiloxane (DVB/CAR/PDMS), for use with autosampler, needle size 23 ga, metal alloy fiber, fiber L 2 cm
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SPME fiber assembly Carboxen/Polydimethylsiloxane (CAR/PDMS), df 85 μm(CAR/PDMS, for use with autosampler, needle size 23 ga, metal alloy fiber
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Carboxen® Adsorbent, matrix Carboxen® 569, 20-45 mesh, bottle of 500 g
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Carboxen® 1000 Reversible SPE Tube, 200 mg/mL, pk 30
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ORBO-93 Sorbent Tube, ORBO tube I.D. × L 6 mm × 95 mm, Bed A 180 mg, Bed B 90 mg, 60/80 mesh, pkg of 25 ea
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Carboxen®-1010 PLOT Capillary GC Column, L × I.D. 30 m × 0.32 mm, average thickness 15 μm
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