AI Article Synopsis
- Tetrasulfanyl terephthalic acid (TST) serves as a versatile ligand that helps advance metal-coordination materials by leveraging a carboxyl-thiol synergy for selective bonding with Zr(IV) ions, creating a structure similar to UiO-66 with a 3D network of connections.
- The resulting ZrTST compound maintains stability in high temperatures (over 300 °C) and boiling water and features a unique composition with some connections sealed by acetate ions.
- Importantly, the ZrTST material demonstrates remarkable properties, including high mercury adsorption from water and enhanced proton conductivity, particularly after the thiol groups are oxidized into sulfonate groups.
Article Abstract
With 2-COOH and 4-SH donors all packed onto the benzene ring, tetrasulfanyl terephthalic acid (TST) is a simple yet fully equipped ligand to move the field of metal-coordination materials─it is now accomplished. The hard-soft carboxyl-thiol synergy is leveraged here in selectively bonding the carboxyl units to Zr(IV) ions to form the same cubic net of UiO-66 (this being based on the terephthalic linker)─with the free-standing dithiolene units equipping the grid of ZrTST. The 3D network of ZrTST averages about 7.6 connections [as in ZrO(OH)(CHOS)], with the other 4.4 sealed by acetate ions. The ZrTST solid is stable in boiling water (it is formed in water/acetic acid/ethane dithiol) and remains ordered even above 300 °C. The thiol-enabled ZrTST (powder) takes up mercury from water with a high distribution coefficient (e.g., 1.2 × 10 mL·g); it also shows proton conductivity (1.9 × 10 S·cm at 90 °C and 90% relative humidity), which, most notably, increases to a highest value of 3.7 × 10 S·cm after oxidizing the -SH into the -SOH groups.
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| http://dx.doi.org/10.1021/acsami.1c20762 | DOI Listing |
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