Structural studies on thiosalicylate complexes of Zn(II) & Hg(II). First insight into Zn(II)-thiosalicylate complex as potential antibacterial, antibiofilm and anti-tumour agent

Publication date: Available online 5 November 2019Source: Inorganica Chimica ActaAuthor(s): Mousumi Nayak, Ashish Kumar Singh, Pradyot Prakash, Rajni Kant, Subrato BhattacharyaAbstractThiosalicylato complexes of Zn(II) and Hg(II), [Zn(SC6H4CO2)(TMEDA)]2 (1) and [TMEDA-H2][Hg(SC6H4CO2)2] (2) where (TMEDA = N,N,N',N'-tetramethylethylenediamine) have been synthesized and characterized by spectral and single crystal X-ray analyses. Thiosalicylate opted different binding modes; in 1 all three binding sites are used whereas in 2 bonding of the ligands are mainly through S atoms, however, Hg-O distances indicate the existence of significant Hg…O interactions. Bonding features have been explained on the basis of DFT calculations. Electronic absorption and emission spectral properties of both complexes have been studied. Electronic transitions have been calculated by TDDFT method and the results are consistent with the experimental spectra. We further have evaluated anti-bacterial, anti-biofilm and anti-tumour activities of 1 in addition to its cytotoxicity profile. It has been found to be highly effective against Escherichia coli, Klebsiella pneumoniae, Methicillin sensitive Staphylococcus aureus, Methicillin resistant Staphylococcus aureus (MRSA) and Pseudomonas aeruginosa clinical as well as reference strains. Interestingly, complex 1 has been found to be more potent than earlier reported Au(III) as well as Pt(II) thiosalicylate complexes. The effect of complex 1 on 72 h ol...
Source: Inorganica Chimica Acta - Category: Chemistry Source Type: research