| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Lang, H.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (22/22 displayed)
- 2018Cobalt and manganese carboxylates for metal oxide thin film deposition by applying the atmospheric pressure combustion chemical vapour deposition processcitations
- 2018The synthesis, chemical and physical properties of silver(I) carboxylates and their use for joining of copper
- 2018Joining of copper at low temperatures using silver(I) carboxylatescitations
- 2018Enantiorecognition performances of "inherently chiral" film electrodes: a successful first example with planar-chirality probes
- 2017Co(II) ethylene glycol carboxylates for Co<inf>3</inf>O<inf>4</inf> nanoparticle and nanocomposite formationcitations
- 2016Manganese half-sandwich complexes as metal-organic chemical vapor deposition precursors for manganese-based thin filmscitations
- 2016Atomic layer deposition of ultrathin Cu2O and subsequent reduction to Cu studied by in situ x-ray photoelectron spectroscopycitations
- 2016Investigation on the structural behavior of a metallically 3D-reinforced CFRP/CFRP joint using a variable search based on finite element analyzescitations
- 2016Structural Aspects of Thermally Cleavable Adducts Derived from the Reaction of Imidazolines with Isocyanatescitations
- 2015Influence of surface treatment and design of 3D-reinforcements on delamination resistance & mechanical properties of CFRP/CFRP joints under static & fatigue loading ; Influence Of Reinforcement Design On Delamination Resistance & Mechanical Properties Of Cfrp/Cfrp Joints Under Static & Fatigue Loading
- 2014Surface chemistry of a Cu(I) beta-diketonate precursor and the atomic layer deposition of Cu2O on SiO2 studied by x-ray photoelectron spectroscopycitations
- 2014High energy X-ray diffraction study of a dental ceramics–titanium functional gradient material prepared by field assisted sintering techniquecitations
- 2014Structural health monitoring with quantum dots
- 2014Influence of an optimized 3D-reinforcement layout on the structural mechanics of co-bonded CFRP joints
- 2013Molecular Wires using (Oligo)pyrroles as Connecting Units: An Electron Transfer Studycitations
- 2012Development and optimization of an innovative joining technique for composite structures using the Finite Element method
- 2012Magneto-optical Kerr-effect studies on copper oxide thin films produced by atomic layer deposition on SiO2citations
- 2009Copper oxide ALD from a Cu(I) beta-diketonate: Detailed growth studies on SiO2 and TaNcitations
- 2009Copper oxide ALD from a Cu(I) beta-diketonate: Growth studies and application as seed layers for electrochemical copper depositioncitations
- 2009Detailed study of copper oxide ALD on SiO2, TaN, and Ru
- 2008ALD of Copper and Copper Oxide Thin Films for Applications in Metallization Systems of ULSI Devices
- 2008Investigation into the strength of components made of UFG aluminium alloys
Places of action
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article
Molecular Wires using (Oligo)pyrroles as Connecting Units: An Electron Transfer Study
Abstract
A series of (oligo)pyrroles featuring redox-active terminal ferrocenyl groups (Fc2-(cC4H2NPh)n (4, n = 1; 9, n = 2; 16, n = 3; 20, n = 4)) has been prepared using a Negishi C,C cross-coupling reaction protocol. The bi-, ter-, and quaterpyrrole wire moieties have been built up by C,C cross-coupling reactions of trimethylsilyl-protected pyrrole units in the presence of [Pd(CH2C(CH3)2P(tC4H9)2)(μ-Cl)]2 as precatalyst. The structural properties of the title compounds were investigated by spectroscopic means and single-crystal X-ray diffraction studies (9, 16, and 20). The influence of the increasing number of N-phenylpyrrole units on the electronic interaction between the iron centers was studied using electrochemistry (cyclic (CV) and square wave voltammetry (SWV)) as well as spectroelectrochemistry (in situ UV/vis/near-IR spectroscopy). With the exception of the diferrocenyl quaterpyrrole 20, the application of [NnBu4][B(C6F5)4] as electrolyte allows the discrete oxidation of the ferrocenyl termini (ΔE°′ = 450 mV (4), ΔE°′ = 320 mV (9), ΔE°′ = 165 mV (16)) in cyclic and square wave voltammograms. However, the iron centers of 20 were oxidized simultaneously, generating dicationic 202+. Additionally, one (9) or two (16 and 20) pyrrole-related well-defined reversible one-electron-redox processes were observed. The cyclic voltammetry data reveal that the splitting of the ferrocene-based redox couples, ΔE°′, decreases with increasing oligopyrrole chain length and, hence, a greater metal–metal distance. The trends in ΔE°′ with oligopyrrole structure also map to the electronic coupling between the ferrocene moieties, as estimated by spectroelectrochemical UV/vis/near-IR measurements. Despite the fact that there is no direct metal–metal interaction in diferrocenyl quaterpyrrole 20, a large absorption in the near-IR region is observed arising from photoinduced charge transfer from the oligopyrrole backbone to the redox-active ferrocenyl termini. These charge transfer absorptions have also been found in the dicationic oxidation state of the mono-(4), bi- (9), and terpyrroles (16). Within this series of diferrocenyl(oligo)pyrroles this CT band is shifted bathochromically with increasing chain length of the backbone motif.