Metallomacrocycle-supported interpenetration networks assembled from binary N-containing ligands†
Abstract
A new semi-rigid ligand of 4,4′-bis(1H-tetrazole)oxydibenzene (H2btzb) was designed and employed to assemble coordination compounds with the help of a secondary linker of 1,4-bis(1-imidazolyl)benzene (bib). Three compounds, including [Zn(btzb)(bib)]n·(H2O)3n (1), [Cd(btzb)(bib)0.5]n (2) and [Cd(btzb)(bib)(H2O)]n·(DMAC)n·(H2O)2n (3) (DMAC = N,N′-dimethylacetamide) with diverse structures, were successfully prepared in the hydro/solvothermal reaction. Single crystal X-ray diffraction analysis demonstrated that compound 1 is composed of two-fold two-dimensional (2D) sheets interpenetrated. 2 displayed a three-dimensional (3D) interpenetrated network. As for the structure of 3, it adopts a 3D network made up of two interpenetrated α-Po nets. Systematical and comparative investigations on these crystal structures of 1–3 disclosed that all compounds share interesting 2-membered metallomacrocycles [M2(btzb2)] (M = Zn and Cd) as a secondary building block. Furthermore, a gas sorption study revealed the porous 3 exhibited a selective adsorption of CO2 over N2 at 273 K.