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Beheshti, Azizolla; Soleymani-Babadi, Susan; Mayer, Peter; Abrahams, Carmel T.; Motamedi, Hossein; Trzybinski, Damian; Wozniak, Krzysztof (2017): Design, Synthesis, and Antibacterial Assessment of Silver(I)-Based Coordination Polymers with Variable Counterions and Unprecedented Structures by the Tuning Spacer Length and Binding Mode of Flexible Bis(imidazole-2-thiones) Ligands. In: Crystal Growth & Design, Vol. 17, Nr. 10: S. 5249-5262
Volltext auf 'Open Access LMU' nicht verfügbar.

Abstract

An investigation of the impact of alkyl spacer length of the flexible ligands and influence of shape and coordination ability of the counterions has been done on a series of five silver(I)-bis(imidazole-2-thione) coordination polymers. The five compounds, namely, [Ag2L4(NO3)(2)](n), {[AgL4](2)[CF3SO3](2)}(n), [Ag2L6(CF3SO3)(2)](n), [Ag2L6(NO3)(ClO4)](n), and [(Ag2LBr2)-Br-6](n) (L-4 = 1,1'-(butane-1,4-diyl)-bis(3-methylimidazoline-2-thione) and L-6 = 1,1'-(hexane-1,4-diyl)-bis(3-methylimidazoline-2-thione) have been characterized by elemental analysis, IR spectra, thermogravimetric analysis (TGA), powder X-ray diffraction, and single crystal X-ray diffraction. In the title polymers, the L-4 and L-6 ligands exhibit unprecedented coordination modes, and the Ag(I) centers adopt a range of coordination geometries. The single crystal structural analysis of the title compounds shows that polymers based on the L-4 ligand predominately adopt AgS4 core structure which does not appear in the polymers containing L-6 ligand. The TGA experimental data reveal that these compounds start to decompose in the temperature range of 240-341 degrees C. All of the synthesized compounds, in particular, polymer 2, possess antibacterial activity against the selected strain of Gram-negative (Escherichia coli, Pseudomonas aeruginosa) and Gram-positive (Staphylococcus aureus, Bacillus subtilis) bacteria.