Synthesis, structures and guest molecules adsorption of Zn(II)-bridged metal-organic polymers

Two coordination polymers {[Zn(fum)(btmb)]·3H2O}n (1) and {[Zn(2,3-pzdc)(tttmb)(H2O)2]·H2O}n (2) (H2fum = fumaric acid, btmb = 4,4′-bis(1,2,4-triazol-1-ylmethyl)biphenyl, 2,3-H2pzdc = 2,3-pyrazinedicarboxylic acid, tttmb = 1,3,5-tris(triazol-1-ylmethyl)-2,4,6-trimethylbenzene) have been synthesized and structurally characterized. Compound 1 is a two-fold interpenetrating 2D network; significant π–π interactions in adjacent layers finally result in a 3D supramolecular framework with 14.167 × 7.831 Å channel. Compound 2 is a 1D chain. The guest molecules (fluorescein and phenylfluorone) adsorption behaviors of 1 and luminescent properties of 1 and 2 have been investigated.

Two coordination polymers {[Zn(fum)(btmb)]·3H2O}n (1) and {[Zn(2,3-pzdc)(tttmb)(H2O)2]·H2O}n (2) (H2fum = fumaric acid, btmb = 4,4′-bis(1,2,4-triazol-1-ylmethyl)biphenyl, 2,3-H2pzdc = 2,3-pyrazinedicarboxylic acid, tttmb = 1,3,5-tris(triazol-1-ylmethyl)-2,4,6-trimethylbenzene) have been synthesized and structurally characterized. 1 was a two-fold interpenetrating 2D network and ultimately formed a 3D supramolecular framework with large channel from significant π–π interactions in adjacent layers, which can respectively adsorb guest molecules of fluorescein and phenylfluorone. The adsorption behaviors were approved by elemental analysis, PXRD and luminescent.Figure optionsDownload as PowerPoint slideHighlights
► Compound 1 is a two-fold interpenetrating 2D network, which finally results in a 3D supramolecular framework with large channel by significant π–π interactions in adjacent layers.
► Compound 1 can adsorb guest molecules of fluorescein and phenylfluorone, respectively.
► The adsorption behaviors were approved by elemental analysis, PXRD and luminescent.