Infinite coordination polymer networks: metallogelation of aminopyridine conjugates and in situ silver nanoparticle formation

Research output: Contribution to journalArticleScientificpeer-review

Researchers

Research units

  • University of Jyväskylä
  • University of Chemistry and Technology, Prague
  • Institute of Experimental Botany

Abstract

Herein we report silver(I) directed infinite coordination polymer network (ICPN) induced self-assembly of low molecular weight organic ligands leading to metallogelation. Structurally simple ligands are derived from 3-aminopyridine and 4-aminopyridine conjugates which are composed of either pyridine or 2,2′-bipyridine cores. The cation specific gelation was found to be independent of the counter anion, leading to highly entangled fibrillar networks facilitating the immobilization of solvent molecules. Rheological studies revealed that the elastic storage modulus (G′) of a given gelator molecule is counter anion dependent. The metallogels derived from ligands containing a bipyridine core displayed higher G′ values than those with a pyridine core. Furthermore, using single crystal X-ray diffraction studies and 1H–15N two-dimensional (2D) correlation NMR spectroscopy, we show that the tetracoordination of silver ions enables simultaneous coordination polymerization and metallosupramolecular cross-linking. The resulting metallogels show spontaneous, in situ nanoparticle (d < 2–3 nm) formation without any additional reducing agents. The silver nanoparticle formation was followed using spectroscopic studies, and the self-assembled fibrillar networks were imaged using transmission electron microscopy (TEM) imaging.

Details

Original languageEnglish
Pages (from-to)442-451
Number of pages10
JournalSoft Matter
Volume15
Issue number3
Publication statusPublished - 1 Jan 2019
MoE publication typeA1 Journal article-refereed

    Research areas

  • CRYSTAL-STRUCTURES, PHASE-TRANSITION, HYBRID MATERIALS, METAL, GELS, STABILIZATION, LUMINESCENCE, REDUCTION, PARTICLES, GELATION

ID: 30486421