Two anthracene chromophore based metal-organic frameworks for gas adsorption and promising nitro aromatic sensing

Two new metal-organic frameworks (MOFs), [Zn-2(mu(3)-OH)(dia)(btb)center dot 2H(2)O]center dot EtOH center dot 0.5DMF (1) and [Cd2Na(btb)(2)(dia)(2)]center dot 2DMF center dot H2O (2) (dia = 9,10-bis(1H-imidazol-1-yl)anthracene, btb = 1,3,5-tris(4-carboxyphenyl)benzene), have been synthesized under solvothermal conditions. Compound1exhibits a (3,10)-connected net based on {Zn-4} SBUs and compound2presents a (3,8)-connected network with a [Cd2Na] unit. The results show that both1and2have a microporous structure and selective adsorption capacity for CO2, and theQ(st)value is 36 kJ mol(-1)and 35 kJ mol(-1), respectively. Studies on luminescence sensing show that1and2are highly selective and recyclable in the detection of nitroaromatic explosives, especially for TNP. It is noteworthy that the quenching constantK(sv)of1and2for TNP (2.84 x 10(5)M(-1)and 2.50 x 10(5)M(-1)) is higher than that of most reported compounds.