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Novel zinc complexes of a non-steroidal anti-inflammatory drug, niflumic acid: Structural characterization, human-DNA and albumin binding properties.

Three novel Zn(II) complexes of NSAID niflumic acid (Hnif) were prepared and studied, namely; [Zn(MeOH)4 (nif)2 ] (1), [Zn(cyclam)(nif)2 ] (2) and [Zn(nif)2 (tmen)] (3), where nif is deprotonated niflumic acid, cyclam is 1,4,8,11-Tetraazacyclotetradecane and tmen is N,N,N',N'-Tetramethylethylenediamine. The complexes have been characterized by infrared spectroscopy, elemental and thermal analysis and single-crystal X-ray structure analysis. All three complexes contain two deprotonated niflumato anions monodentately coordinated via carboxylato groups. Furthermore, fluorescence binding studies of the prepared compounds with human genomic DNA-EB (ethidium bromide) were carried out, which suggest that all complexes are able to bind to DNA via intercalation. Moreover, from the obtained results it followed that complexes 2 and 3 bind to DNA from the tissue with aortic aneurysm (aDNA) and control (cDNA) with a different strength. Additionally, complexes 1-3 exhibit good binding affinity to human serum albumin with high binding constant.

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