As
a new type of porous material, metal–organic frameworks (MOFs)
have been widely studied in gas adsorption and separation, especially
in C2 hydrocarbons. Considering the stronger interaction
between the unsaturated molecules and the metal sites, and the smaller
molecular size of unsaturated molecules, the usual relationship of
affinities and adsorption capacities among C2 hydrocarbons
in most common MOFs is C2H2 > C2H4 > C2H6. Herein, a unique microporous
metal–organic framework, NUM-7a (activated NUM-7), with a completely reversed adsorption relationship
for C2 hydrocarbons (C2H6 > C2H4 > C2H2) has been successfully
synthesized, which breaks the traditional concept of the adsorption
relationship of MOFs for C2 hydrocarbons. Based on this
unique adsorption relationship, a green and simple one-step separation
purification for a large amount of C2H4 can
be expected to be achieved through the selective adsorption of C2H6. In addition, NUM-7a also shows
good selectivities in C2H2/CO2 and
CO2/CH4.
A novel metal-organic framework, ZJU-196, with extraordinary acid-base resistant stability has been successfully synthesized, exhibiting highly efficient separation of acetylene from C2H2/CO2 mixtures under ambient conditions.
Two luminescent coordination polymers with considerable stability in aqueous media were synthesized. Sensing experiments indicate that they can serve as highly selective and sensitive fluorescent probes toward CrVI-anions.
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