Unique microporous NbO-type CoII/ZnII MOFs from double helical chains: Sorption and luminescent properties.

Under solvothermal conditions, the reactions of Co II /Zn II ions with bent ligand 3-(pyridin-4-yl)-5-(pyrazin-2-yl)-1H-1,2,4-triazole (4-Hpzpt) afford two compounds {[M(4-pzpt) 2 ] guest} n (guest=H 2 O, M=Co II ( 1 ), Zn II ( 2 )). Both compounds are the thermally and hydrolytically robust 4-connected 3D NbO framework, which formed by double helical chains to give rise to 1D hollow nanochannel with uncoordinated nitrogens completely exposed on the pore surface. Compound 1 exhibits improved N 2 , CO 2 and H 2 uptake capacities, while compound 2 displays the strong luminescent emission with obvious red shift. [ABSTRACT FROM AUTHOR]