| 1. |
- Gründlinger, Petra, et al.
(author)
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Aggregation of Au(i)-complexes on amorphous substrates governed by aurophilicity
- 2019
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In: Dalton Transactions. - : ROYAL SOC CHEMISTRY. - 1477-9226 .- 1477-9234. ; 48:39, s. 14712-14723
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Journal article (peer-reviewed)abstract
- In single crystals of 2-naphthylisonitrile-gold(i)-halide (halide = Cl, Br, I) complexes, AuMIDLINE HORIZONTAL ELLIPSISAu distances are found to be significantly shorter than twice the van der Waals radius, indicating attractive interactions between gold atoms in adjacent molecules. In the particular case of the studied 2-naphthylisonitrile-gold(i) complexes, homodimers are the common structural motifs, in which the linearly coordinated gold exhibits a crossed swords arrangement with the Au atoms of two molecules being at the intersection point. The crossed swords motif is preserved upon physical vapour deposition of both the chlorine and bromine derivatives on amorphous substrates like glass and glassy carbon. The determined activation energies of desorption for the chlorine (0.9 eV) and the bromine (1.2 eV) derivative are comparable to that of unsubstituted naphthalene. Using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and ion scattering (RBS), we confirmed the chemical integrity of the molecules in thin films and revealed the orientation of the crossed swords dimers with respect to the substrate surface.
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| 2. |
- Miglbauer, Eva, et al.
(author)
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Synthesis and Investigation of N,N-benzylated Epindolidione Derivatives as Organic Semiconductors
- 2016
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In: CHEMISTRYSELECT. - : WILEY-V C H VERLAG GMBH. - 2365-6549. ; 1:20, s. 6349-6355
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Journal article (peer-reviewed)abstract
- We report how the N, N-disubstitution of epindolidione with a benzyl group surprisingly leads to irreversibility of oxidation and thus to only n-type transport in a material with otherwise quasi-reversible reduction and oxidation and charge transport ambipolarity. Cyclic voltammetry, bulk electrolysis and UV-Vis spectroscopic methods were applied to elucidate the electrochemical reaction pathway leading to oxidative degradation and conclude that the same product that can be produced electrochemically is also found in the solid-state device. The chemical substitution of hydrogen-bonded acridone-based semiconductors can lead to substantial changes in their electrical properties, and more broadly, the electrochemistry of organic semiconductors in solution can be closely related to their solid-state charge transport phenomena.
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