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New highly fluorescent silver complexes and their thin films obtained by spin coating method

Abstract

The new silver complexes with ligands obtained from 2(2-pirydyl)ethylamine (epy) or o-phenylenediamine and series aldehydes were obtained and characterized by crystal, molecular and spectroscopic (UV-Vis, fluorescence, IR, NMR) methods. Molecular architecture of the synthesized complexes [Ag2(epy(5-Brthca))2(NO3)2] 1 and [Ag(bzim-anthr)2]+ NO3- 2 has been determined by the X-ray crystal structure analysis. 1H NMR NOE diff. spectra of Ag complexes reveal different ligand conformation in the solution and in the solid state (crystal structure). Thin layers of the studied silver(I) complexes were obtained in the spin coating method in order to get thin (13-113 nm average thickness), homogenous layers. New materials were characterized with AFM, SEM/EDX and ellipsometry. Calculated band-gap energies related to the conformational transitions in layers of complexes 3, 1 and 2 on Si(111) were 2.83±0.02 eV (438±3 nm), 2.90±0.01 eV (428±2 nm) and 2.95±0.02 eV (420±3 nm), respectively. The fluorescence bands of layers observed in the range 470 -580 nm revealed significant intensity and were bathochromically shifted in comparison to the complexes solutions. The influence of the polarity of the solvent on the fluorescence properties of the obtained complexes were studied. The highest quantum yield of the fluorescence was achieved in methylene chloride for 2 with φ2 = 0.52 (λex = 335 – 385 nm) and is related to the anthracene moiety.

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Publication details

The article was received on 30 Jul 2018, accepted on 09 Oct 2018 and first published on 09 Oct 2018


Article type: Paper
DOI: 10.1039/C8NJ03801E
Citation: New J. Chem., 2018, Accepted Manuscript
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    New highly fluorescent silver complexes and their thin films obtained by spin coating method

    M. J. barwiolek, E. Szlyk, A. Wojtczak, A. Kozakiewicz, L. Skowronski, R. Szczęsny and M. babinska, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ03801E

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