3 years ago

Zinc coordination polymers containing isomeric forms of p-(thiazolyl)benzoic acid: blue-emitting materials with a solvatochromic response to water

Lapo Luconi, Samuele Staderini, Andrea Rossin, Giuliano Giambastiani, Philipp Muller, Giulia Tuci, Franziska Eichler, Alexander Eychmüller, Stefan Kaskel
Two coordination polymers of assorted dimensionality (1D, 2D) have been prepared, namely [Zn3(L2Th)4(OH)2 ∙ 2(HL2Th)]n (1) and [Zn(L5Th)(OAc)]n (2), starting from Zn(II) salts and the isomeric forms of the organic linker p-(thiazolyl)benzoic acid: p-(2-thiazolyl)benzoic acid (HL2Th) and p-(5 thiazolyl)benzoic acid (HL5Th). The isomers have been prepared ad hoc following straightforward Pd-catalysed C−C coupling reaction protocols. In 1, the deprotonated ligand is coordinated through its carboxylate group only, with dangling thiazole groups. The -COO- units are bridging adjacent metal centers, thus creating a 1D chain. The structure of 2 is instead made of Zn2(carboxylate)4 "paddle wheel" dimers as the constituting inorganic node. The resulting final assembly is two-dimensional (2D). The luminescent properties of both polymers have been analyzed in the solid state; they are featured by ligand-centered emissions at lambda = 434 nm (1) and 427 nm (2), respectively. The theoretical analysis of the ligands electronic features and related molecular orbitals reveals that the observed transitions are mainly of p - p* nature, involving p orbitals delocalized on both aromatic cycles. A significant (reversible) blue shift of the emission maximum of ca. 60 nm from the visible to the UV region has been observed for 1 when suspended in water.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/ejic.201700830

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.