3 years ago

Stable host–guest complexes of bis-2,6-pyridinedicarboxylate iron(III) with dihydroxybenzenes

Stable host–guest complexes of bis-2,6-pyridinedicarboxylate iron(III) with dihydroxybenzenes
The high reactivity of iron(III) complexes towards phenolic compounds, such as catechol, is well known. We show here that concealing the iron(III) site by ligands helps to obtain stable host–guest iron(III) complexes with phenolic compounds. Host–guest complexes of Htriam[Fe(2,6-pdc)2] with catechol and resorcinol (where 2,6-pdc=2,6-pyridinedicarboxylate and Htriam is mono-protonated 6-phenyl-1,3,5-triazine-2,4-diamine) were prepared and characterized. The observed color for the inclusion complex of Htriam[Fe(2,6-pdc)2] with catechol in the solid state has a distinction from the colored species generated in solution by interactions between the same components. The solid state structures of these two host–guest complexes have differences in the CO distances of dihydroxybenzene ligands as well as the arrangements of π-stacks; in the case of resorcinol, phenolic character is retained. In the catechol host–guest complex the CO distances in catechol are 1.310(7) and 1.370(6)Å, whereas in the resorcinol host–guest complex similar CO distances are 1.368(4) and 1.374(3)Å. The dissimilarity in the CO bond distances of catechol in the host–guest complex suggests charge-transfer through a semi-quinone cation radical type interactions with the iron ion showing an absorption at 570nm for the solid sample. A prior activation of catechol in the second coordination sphere through a ligand–catechol interaction is depicted.

Publisher URL: www.sciencedirect.com/science

DOI: S0277538717305909

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.