A1 Journal article (refereed)
Bipyridine based metallogels : an unprecedented difference in photochemical and chemical reduction in the in situ nanoparticle formation (2017)

Tatikonda, Rajendhraprasad, Bertula, Kia, Nonappa, Hietala, Sami, Rissanen, Kari, Haukka, Matti. (2017). Bipyridine based metallogels : an unprecedented difference in photochemical and chemical reduction in the in situ nanoparticle formation. Dalton Transactions, 46(9), 2793-2802. https://doi.org/10.1039/C6DT04253H

JYU authors or editors

Tatikonda, Rajendhraprasad
Rissanen, Kari
Haukka, Matti

Publication details

All authors or editors: Tatikonda, Rajendhraprasad; Bertula, Kia; Nonappa; Hietala, Sami; Rissanen, Kari; Haukka, Matti

Journal or series: Dalton Transactions

ISSN: 1477-9226

eISSN: 1477-9234

Publication year: 2017

Volume: 46

Issue number: 9

Pages range: 2793-2802

Publisher: Royal Society of Chemistry

Publication country: United Kingdom

Publication language: English

DOI: https://doi.org/10.1039/C6DT04253H

Publication open access: Not open

Publication channel open access:

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/53578

Abstract

Metal co-ordination induced supramolecular gelation of low molecular weight organic ligands is a rapidly expanding area of research due to the potential in creating hierarchically self-assembled multi-stimuli responsive materials. In this context, structurally simple O-methylpyridine derivatives of 4,4′-dihydroxy-2,2′-bipyridine ligands are reported. Upon complexation with Ag(I) ions in aqueous dimethyl sulfoxide (DMSO) solutions the ligands spontaneously form metallosupramolecular gels at concentrations as low as 0.6 w/v%. The metal ions induce the self-assembly of three dimensional (3D) fibrillar networks followed by the spontaneous in situ reduction of the Ag-centers to silver nanoparticles (AgNPs) when exposed to daylight. Significant size and morphological differences of the AgNP's was observed between the standard chemical and photochemical reduction of the metallogels. The gelation ability, the nanoparticle formation and rheological properties were found to be depend on the ligand structure, while the strength of the gels is affected by the water content of the gels.

Keywords: ligands; nanoparticles

Free keywords: metallogels; supramolecular gelation

Fields of science: