The effect of functional groups in the aqueous-phase selective sensing of Fe(iii) ions by thienothiophene-based zirconium metal-organic frameworks and the design of molecular logic gates

Dalton Transactions : an International Journal of Inorganic Chemistry
Rana DalapatiShyam Biswas

Abstract

The synthesis of four isoreticular, water-stable Zr(iv) metal-organic frameworks (MOFs) was conducted under solvothermal conditions by using thienothiophene-based ligands. The MOFs were fully characterized by XRPD analyses, FT-IR spectroscopy and TG analyses. The ligands were systematically modified with methyl and phenyl groups for tuning the fluorescence and hydrophobic behaviour of the MOFs. The photophysical properties of free ligands and the corresponding MOFs were investigated by steady-state as well as time-resolved fluorescence experiments. The MOFs containing π-electron rich, conjugated thieno[3,2-b]thiophene units were employed for the sensing of metal ions. All the MOFs displayed high selectivity and sensitivity towards the sensing of biologically important Fe3+ions in pure aqueous medium through the fluorescence quenching mechanism. Detailed experimental investigations suggest that the transfer of electrons from the electron-rich frameworks to the half-filled 3d orbitals of Fe3+ions results in fluorescence quenching. Surprisingly, the electron acceptor methyl viologen (MV2+) ions exhibited a reverse trend in the quenching efficiency compared to the Fe3+ions. Both the steric and electronic effects of the attached fun...Continue Reading

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Citations

May 22, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Dou-Dou FengJie Yang
Jan 15, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Chiranjib GogoiShyam Biswas
Aug 8, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·M Shahnawaz KhanMusheer Ahmad
Jul 1, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Rana DalapatiShyam Biswas
Feb 3, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Jing JinYao-Yu Wang
Feb 14, 2021·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Run-Dong DingJi-Qing Xu
Oct 9, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Bei LiLiming Fan

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Methods Mentioned

BETA
fluorescence titration
X-ray
fluorescence titration measurement
thermal treatment
fluorescence

Software Mentioned

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