| 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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Zhang, Chi
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (16/16 displayed)
- 2024Nanostructure and interfacial mechanical properties of PEG/cellulose nanocomposites studied with molecular dynamicscitations
- 2024Anisotropic Deformation in a Polymer Slab Subjected to Fluid Adsorptioncitations
- 2023Phytic Acid-Silica System for Imparting Fire Retardancy in Wood Compositescitations
- 2022Adaptive duplication and genetic diversification of protein kinase R contribute to the specificity of bat-virus interactionscitations
- 2022Growth-microstructure-thermal property relations in AlN thin filmscitations
- 2022Unravelling thermal-mechanical effects on microstructure evolution under superplastic forming conditions in a near alpha titanium alloycitations
- 2020Moisture-induced crossover in the thermodynamic and mechanical response of hydrophilic biopolymercitations
- 2020Disentangling heat and moisture effects on biopolymer mechanicscitations
- 2019Wood–moisture relationships studied with molecular simulations: methodological guidelinescitations
- 2018Quadratic and cubic hyperpolarizabilities of nitro-phenyl/-naphthalenyl/-anthracenyl alkynyl complexescitations
- 2018Using modeling to understand the hygromechanical and hysteretic behavior of the S2 cell wall layer of woodcitations
- 2015Syntheses, Electrochemical, Linear Optical, and Cubic Nonlinear Optical Properties of Ruthenium-Alkynyl-Functionalized Oligo(phenylenevinylene) Starscitations
- 2015Pressure, stress, and strain distribution in the double-stage diamond anvil cellcitations
- 2010Highly sensitive bend sensor based on Bragg grating in eccentric core polymer fibercitations
- 2007Recent developments of Bragg gratings in PMMA and TOPAS polymer optical fibers
- 2007Recent developments of Bragg gratings in PMMA and TOPAS polymer optical fibers
Places of action
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article
Syntheses, Electrochemical, Linear Optical, and Cubic Nonlinear Optical Properties of Ruthenium-Alkynyl-Functionalized Oligo(phenylenevinylene) Stars
Abstract
<p>The syntheses of trans-[Ru(C≡CC<sub>6</sub>H<sub>4</sub>-4-CHO)(C≡CC<sub>6</sub>H<sub>4</sub>-4-R)(dppe)<sub>2</sub>] (R=H (9a), NO<sub>2</sub> (9b), CHO (9c), C≡CC<sub>6</sub>H<sub>3</sub>-3,5-Et<sub>2</sub> (9d), (E)-CHCHC<sub>6</sub>H<sub>4</sub>-4-tBu (9e); dppe=1,2-bis(diphenylphosphino)ethane), trans-[Ru(C≡CC<sub>6</sub>H<sub>4</sub>-4-R)Cl(dppe)<sub>2</sub>] (R=C≡CC<sub>6</sub>H<sub>3</sub>-3,5-Et<sub>2</sub> (11a), (E)-CHCHC<sub>6</sub>H<sub>4</sub>-4-tBu (11b), (E)-CHCHC<sub>6</sub>H<sub>4</sub>-4-NO<sub>2</sub> (11c)), 1,2,4,5-{trans-[(dppe)<sub>2</sub>(RC<sub>6</sub>H<sub>4</sub>C≡C)Ru{C≡CC<sub>6</sub>H<sub>4</sub>-4-(E)-CHCH}]}<sub>4</sub>C<sub>6</sub>H<sub>2</sub> (R=H (14a), C≡CC<sub>6</sub>H<sub>3</sub>-3,5-Et<sub>2</sub> (14b), (E)-CHCHC<sub>6</sub>H<sub>4</sub>-4-tBu (14c)), 1-I-3,5-{trans-[(L<sub>2</sub>)<sub>2</sub>(R)Ru{C≡CC<sub>6</sub>H<sub>4</sub>-4-(E)-CHCH}]}<sub>2</sub>C<sub>6</sub>H<sub>3</sub> (L<sub>2</sub>=1,1-bis(diphenylphosphino)methane (dppm)), R=Cl (15a); L<sub>2</sub>=dppe, R=C≡CPh (15b), R=C≡CC<sub>6</sub>H<sub>4</sub>-4-NO<sub>2</sub> (15c)), 1-Me<sub>3</sub>SiC≡C-3,5-{trans-[(L<sub>2</sub>)<sub>2</sub>(R)Ru{C≡CC<sub>6</sub>H<sub>4</sub>-4-(E)-CHCH}]}<sub>2</sub>C<sub>6</sub>H<sub>3</sub> (L<sub>2</sub>=dppm, R=Cl (16a); L<sub>2</sub>=dppe, R=C≡CPh (16b)), 1-HC≡C-3,5-{trans-[(dppe)<sub>2</sub>(R)Ru{C≡CC<sub>6</sub>H<sub>4</sub>-4-(E)-CHCH}]}<sub>2</sub>C<sub>6</sub>H<sub>3</sub> (R=Cl (17a), R=C≡CPh (17b)), and 1,3,5-{trans-[(dppe)<sub>2</sub>(3,5-R<sub>2</sub>-C<sub>6</sub>H<sub>3</sub>C≡C)Ru{C≡CC<sub>6</sub>H<sub>4</sub>-4-(E)-CHCH}]}<sub>3</sub>C<sub>6</sub>H<sub>3</sub> (R=(E)-CHCHC<sub>6</sub>H<sub>4</sub>-4-C≡C-trans-[Ru(C≡CPh)(dppe)<sub>2</sub>] (18)) are reported together with those of the precursor alkynes 1-RC≡C-3,5-Et<sub>2</sub>C<sub>6</sub>H<sub>3</sub> (R=SiMe<sub>3</sub> (2), H (3), C<sub>6</sub>H<sub>4</sub>-4-C≡CSiMe<sub>3</sub> (5), C<sub>6</sub>H<sub>4</sub>-4-C≡CH (6)). The identities of 9c, 9d, 9e, 11a, and trans-[Ru{C≡CC<sub>6</sub>H<sub>4</sub>-4-(E)-CHCHC<sub>6</sub>H<sub>4</sub>-4-tBu}<sub>2</sub>(dppe)<sub>2</sub>] (12 and 12′) were confirmed by single-crystal X-ray diffraction studies. The electrochemical properties of 9a-e, 11a-b, 14a-c, 15a-c, 16b, 17a, 17b, and 18 were assessed by cyclic voltammetry; the studies reveal that potentials for the fully/quasi-reversible metal-centered oxidation processes decrease upon introduction of solubilizing alkyl substituents and increase upon increasing acceptor substituent strength; other structural variations have little impact. UV/Vis-NIR spectroscopic studies on these complexes reveal lowest-energy metal-ligand charge transfer (MLCT) bands that redshift upon increasing the acceptor substituent strength, blueshift on alkyl incorporation, and gain in intensity on progression from linear to star complexes. Low-temperature UV/Vis-NIR spectroelectrochemical studies of 14a-c show the appearance of an intense low-energy band at 7400-7900cm<sup>-1</sup> that is redshifted upon π-system lengthening and alkyl substituent incorporation. The cubic nonlinear optical properties of 9d, 9e, 14a-c, 15a-c, 16b, 17a,b, and 18 were assayed by femtosecond Z-scan studies at benchmark wavelengths (750 and 800nm) in the near-IR region, with nonlinearity increasing upon nitro incorporation; the values for the E-ene-linked dendrimers in these studies are much larger than yne-linked analogues. Compounds 9d, 9e, 14a-c, and 18 were further examined by broad-spectral-range femtosecond Z-scan studies; the cruciform complexes have appreciable multiphoton absorption cross-sections, with maximal values close to two and three times the wavelength of the linear optical absorption maxima. Super stars: (4-Formylphenylethynyl)ruthenium complexes (see figure) are shown to undergo "chemistry-on-complex" Horner-Wadsworth-Emmons coupling to afford a range of tri- and tetraruthenium-functionalized star molecules and a nonaruthenium dendrimer. The products are nonlinear optical (NLO)-active, with linear optical properties that are redox-switchable.</p>