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A small family of [Co₂( L pytrz  )₃] 6+ cylinders was synthesised from bis(bidentate) 2-pyridyl-1,2,3-triazole "click" ligands ( L pytrz  ) through an "assembly-followed-by-oxidation" method. The cylinders were characterised using ¹H, 13 C, and DOSY NMR, IR, and UV-Vis spectroscopies, along with electrospray ionisation mass spectrometry (ESMS). Stability studies were conducted in dimethyl sulfoxide (DMSO) and D₂O. In contrast to similar, previously studied, [Fe₂( L pytrz  )₃] 4+ helicates the more kinetically inert [Co₂( L pytrz  )₃] 6+ systems proved stable (over a period of days) when exposed to DMSO and were even more stable in D₂O. The triply stranded [Co₂( L pytrz  )₃] 6+ systems and the corresponding "free" ligands were tested for antimicrobial activity in vitro against both Gram-positive ( Staphylococcus aureus ) and Gram-negative ( Escherichia coli ) microorganisms. Agar-based disk diffusion and Mueller-Hinton broth micro-dilution assays showed that the [Co₂( L pytrz  )₃] 6+ cylinders were not active against either strain of bacteria. It is presumed that a high charge of the [Co₂( L pytrz  )₃] 6+ cylinders is preventing them from crossing the bacterial cell membranes, rendering the compounds biologically inactive.

molecules/molecules online/molecules annual

Oxidatively Locked [Co2L3]6+ Cylinders Derived from Bis(bidentate) 2-Pyridyl-1,2,3-triazole “Click” Ligands: Synthesis, Stability, and Antimicrobial Studies