Journal
INORGANICA CHIMICA ACTA
Volume 537, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ica.2022.120923
Keywords
Coordination polymers; Zinc; Uranium; Thiazole; Powder X-ray diffraction (PXRD); Single-crystal X-ray Diffraction; UV-Vis spectroscopy
Categories
Funding
- Universita dell'Insubria
- National Research Foundation of Ukraine [2020.02/0071]
- Italian MIUR through the PRIN 2017 project MULTI-e [20179337R7]
- TRAINER project Catalysts for Transition to Renewable Energy Future [ANR-17-MPGA-0017]
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A new ditopic ligand [2,2'-(1,4-phenylene)bithiazole]-5,5'-dicarboxylic acid (H2TzPhTz) was synthesized and its crystal structure determination revealed an extended hydrogen-bond network. Reaction with ZnII and UVI salts yielded two coordination polymers, [Zn(TzPhTz)(H2O)(2)] (Zn_TzPhTz) and [UO2(TzPhTz)(DMF)].DMF (U_TzPhTz). Both polymers emit blue-green light in the solid state.
The new ditopic ligand [2,2'-(1,4-phenylene)bithiazole]-5,5'-dicarboxylic acid (H2TzPhTz) was synthesized in similar to 70% yield through a classical Hantzsch synthesis. Isolation of the dimethyl ester intermediate Me2TzPhTz as the trifluoroacetic acid adduct Me2TzPhTz.2CF3CO2H allowed its crystal structure determination, revealing that the constituting molecules are interconnected through an extended hydrogen-bond network. Reaction of H2TzPhTz with suitable ZnII and UVI salts yielded the 1-D coordination polymers [Zn(TzPhTz)(H2O)(2)] (Zn_TzPhTz) and [UO2(TzPhTz)(DMF)].DMF (U_TzPhTz). The former is characterized by zig-zag chains with cis- {Zn(OCOO)4(OH2O)(2)} nodes and mu-12:12-TzPhTz2-spacers, while in the latter TzPhTz-bridged {UO2(TzPhTz) (DMF)}2 dimeric units form polymeric strands. In the solid state, both H2TzPhTz and Zn_TzPhTz emit in the blue-green visible region (lambda em = 474 and 477 nm, respectively). The two coordination polymers witness the versatility of H2TzPhTz as a linker toward d and f metal ions, and they should be considered as the preliminary step toward the preparation of TzPhTz-based metal-organic frameworks for practical applications in the field of luminescence sensing.
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