Two unusual 3D and 2D zinc coordination polymers containing 2D or 1D [Zn2(btec)]n based on flexible bis(triazole) and rigid benzenetetracarboxylate co-ligands

In order to investigate the influence of flexible bis(triazole) ligands on the motifs, two zinc coordination polymers {[Zn2(bte)(btec)(H2O)4]•2H2O}n (1) and {[Zn2(btp)2(btec)]•10H2O}n (2) were synthesized by the self-assembly reaction of 1,2,4,5-benzenetetracarboxylate (btec), 1,2-bis(1,2,4-triazol-1-yl)ethane (bte), or 1,3-bis(1,2,4-triazol-1-yl)propane (btp). In 1, the bte ligands connect the 2D [Zn2(btec)]n networks to generate an unusual (3,4)-connected 3D network. The Schläfli symbol of the 3D network is (6•102)(62104). In 2, each btp ligand links two [Zn2(btec)]n 1D belts to form a (4,4)-connected 2D network with the 1D channels ca. 8.0 × 10.0 Å2 along the a-axis. The btp ligands of each 2D network interpenetrate into two adjacent identical 2D networks to form a 3D supramolecular network in 2. The luminescences and thermal stabilities of 1 and 2 were also investigated.

Graphical abstractTwo zinc coordination polymers were synthesized by flexible bis(triazole) and rigid benzenetetracarboxylate co-ligands. 1 forms an unusual (3,4)-connected 3D network by each bte connects two 2D [Zn2(btec)]n networks. 2 constructs a 2D network by each btp links two [Zn2(btec)]n 1D belts.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Flexible bis(triazole) and rigid 1,4-benzenedicarboxylate co-ligands. ► 2D and 1D [Zn2(btec)]n. ► (3,4)-Connected 3D network. ► (4,4)-Connected 2D coordination network and 3D supramolecular network. ► The luminescences and thermal stabilities.