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Radnović, Nikola D; Štetin, Nađa; Radanović, Mirjana M; Borišev, Ivana Đ; Rodić, Marko V; Jaćimović, Željko K; Barta Holló, Berta
Inorganics, 01/2024, Volume: 12, Issue: 1Journal Article
The synthesis of the first Ag(I) complexes with ethyl-5-amino-1-methyl-1H-pyrazole-4-carboxylate (L) is presented. The reaction of AgClO4 with the ligand in a molar ratio of 1:1 gives a bis(ligand) complex AgL2ClO4 (1) in the presence of 4-formylbenzonitrile, monoperiodic polymer {AgL2ClO4}n (2). Characterization involved IR spectroscopy, conductometric measurements, thermogravimetric analysis, antioxidant tests, powder, and single crystal X-ray diffraction. Structural analysis revealed ligand coordination in a monodentate manner through the nitrogen atom of the pyrazole ring in both complexes. Complex 1 displayed a linear coordination environment for Ag(I), whereas, in complex 2, square-planar coordination was achieved with the additional involvement of two oxygen atoms from bridging perchlorate anions. Notably, the thermal properties of both isomers are found to be nearly identical. The significant antioxidant activity of the isomer with a reverse-oriented pyrazole-type ligand suggests its potential relevance in biological studies.
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