A novel porous aromatic framework, PAF-8, derived from tetraphenylsilane as basic building unit, was successfully synthesized via Friedel-Crafts alkylation reaction. This PAF material had high thermal stability as well as high surface area （785 m^2 g^-1） calculated from the Brunauer-Emmett-Teller （BET） model. Meanwhile, PAF-8 possessed high performances in gas sorption and especially for CO2 separation.
Two porous aromatic frameworks,PAF-36 and PAF-37,containing azo moieties,were synthesized via Sonogashira–Hagihara coupling reactions. Gas sorption measurements indicated that reversible stimuli-responsive adsorption properties were triggered by ultraviolet(UV) irradiation and heat treatment,because of the presence of azo functional groups. The initial Brunauer–Emmett–Teller(BET) surface areas of PAF-36 and PAF-37 were 325 and 443 m2 g-1,respectively. After UV irradiation,the BET surface areas increased during the trans-cis isomerization process,and the micropore sizes,around 6 and 8 ?,also increased. In addition,the CO2 adsorption capacities increased slightly because of trans-cis conversion of azo groups. It is worth mentioning that the CO2 uptakes of the polymers were almost constant during multiple cycles of alternating external stimuli,displaying high switchability of the trans-cis isomerization.
A new coordination polymer, {[CdL（en）]＇DMF}n （1, H2L = 4-[（8-hydroxy-5- quinolinyl）azo]-benzenesulfonic acid, en = ethylenediamine, DMF = N,N-dimethylformamide）, has been solvothermally synthesized and structurally characterized by single-crystal X-ray diffrac- tion, infrared （IR） spectra, elemental analysis, powder X-ray diffractions （PXRD） and thermo- gravimetric analysis （TGA）. Compound 1 crystallizes in monoclinic, space group P2Jc with a = 14.6525（9）, b = 13.3917（9）, c = 11.8838（8） A, β = 101.2290（10）°, V = 2287.2（3） A3, Z = 4, C20H24CdN6OsS, Mr = 572.91, Dc. = 1.664 mg-mm-3, F（000） = 1160, p = 1.091 mm-1, R = 0.0232 and wR = 0.0587 for 3597 observed reflections （I 〉 2σ（I））. Compound 1 exhibits a one-dimensional （1D） double-chain structure which is further connected through hydrogen bonding and π-π interactions into a three-dimensional （3D） supramolecular network. In addition, it exhibits blue fluorescence at room temperature in the solid state.
