16819-43-5Relevant articles and documents
Single-crystal to single-crystal mechanical contraction of metal-organic frameworks through stereoselective postsynthetic bromination
Marshall, Ross J.,Griffin, Sarah L.,Wilson, Claire,Forgan, Ross S.
, p. 9527 - 9530 (2015)
The properties of metal-organic frameworks (MOFs) can be tuned by postsynthetic modification (PSM) to introduce specific functionalities after their synthesis. Typically, PSM is carried out on pendant functional groups or through metal/ligand exchange, preserving the structure of the MOF. We report herein the bromination of integral alkyne units in a pair of Zr4+ and Hf4+ MOFs, which proceeds stereoselectively in a single-crystal to single-crystal manner. The chemical and mechanical changes in the MOFs are extensively characterized, including the crystal structures of the postsynthetically brominated materials, which show a mechanical contraction of up to 3.7% in volume. The combination of stability and chemical reactivity in these MOFs leads to the possibility of tuning mechanical properties by chemical transformation while also opening up new routes to internal pore functionalization.
A series of coordination networks constructed from the rigid ligand 4,4′-ethynylenedibenzoate: Topological diversity, entanglement, supramolecular interactions and photophysical properties
Martins,Resende,Ronconi
, p. 3103 - 3116 (2017)
Four coordination networks (CNs), i.e., [Co(edb)(H2O)(Py)2], 3; [Cd(edb)(DMSO)2]·0.5(DMSO), 4; [Er2(edb)3(DMSO)2(H2O)2], 5; and [Gd2(edb)3(H2O)4], 6 (edb2- = 4,4′-ethynylenedibenzoate), were synthesized and structurally characterized, and the luminescence properties of CNs 4 and 5 were investigated. In CN 3, the ligand adopts a bridging coordination mode that connects one Co(ii) ion to another, resulting in a 1D CN. CNs 4 and 5 contain binuclear centers that are linked to four ligands in the chelating and bridging coordination modes. CN 4 has a 2D → 3D inclined polycatenated structure, whereas CN 5 exhibits a 3D network because the voids created by the long ligand are stabilized by the π-π stacking interactions, thereby avoiding the entanglement of the structure. CN 6 has a paddle-wheel structure with a two-fold interpenetrated rob topology. The photophysical properties of the compound H2edb and CNs 4 and 5 were studied in the solid state. Compound 2 (H2edb) displays strong absorption bands at 325 and 350 nm and emission at 385 nm. Upon complexation with Er(III), the emission was quenched. The emissions of CN 4 were due to the intraligand transitions.
Ligand-elaboration as a strategy for engendering structural diversity in porous metal-organic framework compounds
Gadzikwa, Tendai,Zeng, Bi-Shun,Hupp, Joseph T.,Nguyen, SonBinh T.
supporting information; experimental part, p. 3672 - 3674 (2009/02/05)
A series of 4,4′-ethynylenedibenzoic acids were synthesized and used in the construction of Zn-based, mixed-ligand metal-organic frameworks; through variation of functionality in the 3- and 3′-positions of these linkers, a collection of MOFs with differing connectivities and varying levels of interpenetration was obtained. The Royal Society of Chemistry.
