http://publicationslist.org/data/michel.sliwa/atom.xml Michel Sliwahttp://publicationslist.org/michel.sliwa$basepathfavicon.icoRecent additions to Michel Sliwa's PublicationsList.org pagehttp://publicationslist.org/publications.png2008-11-06T18:46:47Z http://publicationslist.org/michel.sliwa/refid21 2008-11-06T12:50:10Z

Highly fluorescent organic nanoparticles with size of about 300 nm were prepared by nanosecond laser ablation of micrometer-sized powder of dendronized perylenediimide dispersed in water. The nanoparticle colloidal solution provided a fluorescence quantum yield of 0.58. The absorption and emission spectral studies demonstrated that the bulky dendron groups at the side bays of perylenediimide chrom...<br/><br/>R Yasukuni, T Asahi, T Sugiyama, H Masuhara, M Sliwa, J Hofkens, F C De Schryver, M Van der Auweraer, A Herrmann, K Muller (2008) <i>Applied Physics a-Materials Science & Processing</i> <i></i> <i><Go to ISI>://WOS:000258524000002 </i> 93: 1 5-9<br/>

http://publicationslist.org/michel.sliwa/refid9 2008-11-06T12:50:10Z

In situ observation of single oxidation/halogenation events by catalytically generated hypobromite species using single molecule fluorescence microscopy allows montioring of the diffusion behavior of these halonium species from the catalyst into the bulk solution. The fluororgenic probe specifically reacts with hypohalites, yielding fluorescein that can be detected with single molecule sensitivity...<br/><br/>V M Martinez, G De Cremer, M B J Roeffaers, M Sliwa, M Baruah, D E De Vos, J Hofkens, B F Sels (2008) <i>Journal of the American Chemical Society</i> <i></i> <i><Go to ISI>://WOS:000259675500004 </i> 130: 40 13192-13193<br/>

http://publicationslist.org/michel.sliwa/refid3 2008-11-06T12:50:10Z

G De Cremer, Y Antoku, M B J Roeffaers, M Sliwa, J Van Noyen, S Smout, J Hofkens, D E De Vos, B F Sels, T Vosch (2008) <i>Angewandte Chemie-International Edition</i> <i></i> <i><Go to ISI>://WOS:000254885200016 </i> 47: 15 2813-2816<br/>

http://publicationslist.org/michel.sliwa/refid16 2008-11-06T12:50:10Z

N-(3,5-Ditert-butylsalicylidene)-2-aminopyridine (1) exhibits bulk second harmonic generation (SHG) activity (2 vs urea). X-ray diffraction measurements show a non-centrosymmetric structure (P3(2)). Experimental data of polarization-dependent SHG match the theoretical calculations on the basis of the crystallographic data. 1 is also thermochromic in the crystalline state, and SHG at 120 K is 4 tim...<br/><br/>M Sliwa, A Spangenberg, I Malfant, P G Lacroix, R Metivier, R B Pansu, K Nakatani (2008) <i>Chemistry of Materials</i> <i></i> <i><Go to ISI>://WOS:000256854800040 </i> 20: 12 4062-4068<br/>

http://publicationslist.org/michel.sliwa/refid11 2008-11-06T12:50:10Z

A new pH and metal ion-responsive BODIPY-based fluorescent probe with an aza crown ether subunit has been synthesized via condensation of 4-(1,4,7,10-tetraoxa-13-aza-cyclopentadec-13-yl)-benzaldehyde with the appropriate 1,3,5,7-tetramethyl substituted boron dipyrromethene moiety. Steady-state and time-resolved fluorometries have been used to study the spectroscopic and photophysical characteristi...<br/><br/>W W Qin, M Baruah, M Sliwa, M Van der Auweraer, W M De Borggraeve, D Beljonne, B Van Averbeke, N Boens (2008) <i>Journal of Physical Chemistry A</i> <i></i> <i><Go to ISI>://WOS:000257335000008 </i> 112: 27 6104-6114<br/>

http://publicationslist.org/michel.sliwa/refid17 2008-11-06T12:50:10Z

In photochromic materials, we demonstrated that non-linear optical (NLO) properties such as second harmonic generation (SHG) can be switched reversibly by alternate UV and visible irradiations. We report here on the design of materials fulfilling the prerequisites for SHG activity (push-pull and acentric space group) and photochromic properties. Photochromic and NLO properties of a series of anils...<br/><br/>M Sliwa, A Spangenberg, R Metivier, S Letard, K Nakatani, P Yu (2008) <i>Research on Chemical Intermediates</i> <i></i> <i><Go to ISI>://WOS:000254677100008 </i> 34: 2-3 181-190<br/>

http://publicationslist.org/michel.sliwa/refid20 2008-11-06T12:50:10Z

By using single molecule fluorescence spectroscopy we have investigated the excitation energy migration processes occurring in a series of cyclic porphyrin arrays bearing a close proximity in overall architectures to the LH2 complexes in purple bacterial photosynthetic systems. We have revealed that the conformational heterogeneity induced by the structural flexibility in large cyclic porphyrin ar...<br/><br/>J Yang, M Park, Z S Yoon, T Hori, X B Peng, N Aratani, P Dedecker, J I Hotta, H Uji-I, M Sliwa, J Hofkens, A Osuka, D Kim (2008) <i>Journal of the American Chemical Society</i> <i></i> <i><Go to ISI>://WOS:000253100200026 </i> 130: 6 1879-1884<br/>

http://publicationslist.org/michel.sliwa/refid8 2008-11-06T12:50:10Z

Several authors demonstrated that an oligonucleotide based pH-sensitive construct can act as a switch between an open and a closed state by changing the pH. To validate this process, specially designed fluorescence dye-quencher substituted oligonucleotide constructs were developed to probe the switching between these two states. This paper reports on bulk and single molecule fluorescence investiga...<br/><br/>B Kolaric, M Sliwa, M Brucale, R A L Vallee, G Zuccheri, B Samori, J Hofkens, F C De Schryver (2007) <i>Photochemical & Photobiological Sciences</i> <i></i> <i><Go to ISI>://WOS:000247783100014 </i> 6: 6 614-618<br/>

http://publicationslist.org/michel.sliwa/refid7 2008-11-06T12:50:10Z

Shape persistent perylene diimide (PDI) multichromophores incorporating ethynylene bridges have been synthesized in high yield via palladium-catalyzed Hagihara coupling, which provides compounds with no rotational or constitutional isomerism in contrast to polyphenylene dendrimers. Their excited-state pathways have been studied at the ensemble and at the single-molecule level and compared to sever...<br/><br/>C Flors, I Oesterling, T Schnitzler, E Fron, G Schweitzer, M Sliwa, A Herrmann, M van der Auweraer, F C de Schryver, K Mullen, J Hofkens (2007) <i>Journal of Physical Chemistry C</i> <i></i> <i><Go to ISI>://WOS:000245084100057 </i> 111: 12 4861-4870<br/>

http://publicationslist.org/michel.sliwa/refid4 2008-11-06T12:50:10Z

In situ observation of the catalytic activity of individual M-chymotrypsin enzymes reveals a novel pathway for spontaneous deactivation. Rather than deactivating abruptly in a one-step process, the enzyme seems to struggle for life; the activity decreases stepwise with intermittent inactive periods before deactivating irreversibly. During the active periods, dynamic disorder and memory effects are...<br/><br/>G De Cremer, M B J Roeffaers, M Baruah, M Sliwa, B F Sels, J Hofkens, D E De Vos (2007) <i>Journal of the American Chemical Society</i> <i></i> <i><Go to ISI>://WOS:000251581900024 </i> 129: 50 15458-+<br/>

http://publicationslist.org/michel.sliwa/refid2 2008-11-06T12:50:10Z

The single-molecule fluorescence blinking behavior of the organic dye Atto647N in various polymer matrixes such as Zeonex, PVK, and PVA as well as aqueous media was investigated. Fluorescence blinking with off-times in the millisecond to second time range is assigned to dye radical ions formed by photoinduced electron transfer reactions from or to the environment. In Zeonex and PVK, the measured o...<br/><br/>J N Clifford, T D M Bell, P Tinnefeld, M Heilemann, S M Melnikov, J Hotta, M Sliwa, P Dedecker, M Sauer, J Hofkens, E K L Yeow (2007) <i>Journal of Physical Chemistry B</i> <i></i> <i><Go to ISI>://WOS:000247435700005 </i> 111: 25 6987-6991<br/>

http://publicationslist.org/michel.sliwa/refid5 2008-11-06T12:50:10Z

The fast and reversible on/off switching of the fluorescence emission of the GFP-like fluorescent protein Dronpa has attracted considerable interest for applications in subdiffraction imaging. In this paper we study the use of a donut-mode beam in combination with two more overlapping laser beams to increase the imaging resolution through selective switching to the nonfluorescent photoswitched sta...<br/><br/>P Dedecker, J I Hotta, C Flors, M Sliwa, H Uji-I, M B J Roeffaers, R Ando, H Mizuno, A Miyawaki, J Hofkens (2007) <i>Journal of the American Chemical Society</i> <i></i> <i><Go to ISI>://WOS:000251974000067 </i> 129: 51 16132-16141<br/>

http://publicationslist.org/michel.sliwa/refid19 2008-11-06T12:50:10Z

N-(3,5-Di-tert-butylsalicylidene)-4-iodobenzene (1) is photochromic in the solid state, owing to its ability to yield enol-keto tautomerism. Despite its centrosymmetric structure (P2(1)/c), polycrystalline thin films of I show second harmonic generation (SHG). Moreover, this SHG can be reversibly switched by light. Investigations using confocal microscopy showed that a morphology change occurs whe...<br/><br/>A Spangenberg, M Sliwa, R Metivier, R Dagnelie, A Brosseau, K Nakatani, R Pansu, I Malfant (2007) <i>Journal of Physical Organic Chemistry</i> <i></i> <i><Go to ISI>://WOS:000251947100028 </i> 20: 11 992-997<br/>

http://publicationslist.org/michel.sliwa/refid13 2008-11-06T12:50:10Z

Single-molecule fluorescence spectroscopy was performed on a number of perylene diimide multichromophores with different dendritic geometries, with the particular goal of characterizing their performance as single-photon sources at room temperature. The quality of the different perylene diimide-containing dendrimers as single-photon sources was evaluated by determining the Mandel parameter. Values...<br/><br/>M Sliwa, C Flors, I Oesterling, J Hotta, K Mullen, F C De Schryver, J Hofkens (2007) <i>Journal of Physics-Condensed Matter</i> <i></i> <i><Go to ISI>://WOS:000250688400006 </i> 19: <br/>

http://publicationslist.org/michel.sliwa/refid15 2008-11-06T12:50:10Z

Polarization dependence of the second harmonic generation (SHG) was studied on a single crystal of the photochromic N-(3,5-di-tertbutylsalicylidene)-4-aminopyridine (4P). The optimal polarization condition for SHG is obtained when both the fundamental and second harmonic waves are parallel to the main axis of the crystal. This experimental result was correlated with calculations based on X-ray dif...<br/><br/>M Sliwa, K Nakatani, T Asahi, P G Lacroix, R B Pansu, H Masuhara (2007) <i>Chemical Physics Letters</i> <i></i> <i><Go to ISI>://WOS:000245737600010 </i> 437: 4-6 212-217<br/>

http://publicationslist.org/michel.sliwa/refid10 2008-11-06T12:50:10Z

Covalently linked cyclic porphyrin arrays have been synthesized to mimic natural light-harvesting apparatuses and to investigate the highly efficient energy migration processes occurring in these systems for future applications in molecular photonics. To avoid an ensemble-averaged picture, we performed a single-molecule spectroscopic study on the energy migration processes of cyclic porphyrin arra...<br/><br/>M Park, M C Yoon, Z S Yoon, T Hori, X B Peng, N Aratani, J I Hotta, H Uji-i, M Sliwa, J Hofkens, A Osuka, D Kim (2007) <i>Journal of the American Chemical Society</i> <i></i> <i><Go to ISI>://WOS:000245041300037 </i> 129: 12 3539-3544<br/>

http://publicationslist.org/michel.sliwa/refid12 2008-11-06T12:50:10Z

We have prepared two fluorescent dyes derived from 8-(4-tolyl)-4,4-difluoro-4-bora-3a, 4a-diaza-s-indacene with phenoxy and (o-bromo) phenoxy substituents at the 3,5- positions by a novel nucleophilic substitution reaction of the corresponding 3,5-dichloroBODIPY analogue. UV-vis absorption, steady-state and time-resolved fluorimetry have been used to investigate their solvent-dependent photophysic...<br/><br/>T Rohand, J Lycoops, S Smout, E Braeken, M Sliwa, M Van der Auweraer, W Dehaen, W M De Borggraeve, N Boens (2007) <i>Photochemical & Photobiological Sciences</i> <i></i> <i><Go to ISI>://WOS:000249925700011 </i> 6: 1061-1066<br/>

http://publicationslist.org/michel.sliwa/refid18 2008-11-06T12:50:10Z

Vapor deposition method was used to obtain nanocrystals of N-(3,5-di-tert-butylsalicylidene)-4-aminopyridine (1) and N-(3,5-di-tert-butylsalicylidene)-4-iodoaniline (2), and nanoscale thin layers (65 nm thick) of cis-1,2-dicyano-1,2-bis(2,4,5-trimethyl-3-thienyl)ethene (3). Compound 3 was also deposited on a substrate previously covered by gold nanoparticles (phi = 100 nm). Nanoscale crystals of 1...<br/><br/>A Spangenberg, A Brosseau, R Metivier, M Sliwa, K Nakatani, T Asahi, T Uwada (2007) <i>Journal of Physical Organic Chemistry</i> <i></i> <i><Go to ISI>://WOS:000251947100027 </i> 20: 11 985-991<br/>

http://publicationslist.org/michel.sliwa/refid1 2008-11-06T12:50:10Z

This paper reports the dynamics of the photochromic reaction of crystalline N-(3,5di-tert-butylsalicyliden)-4-aminopyridine which can be applied for nonlinear optical photoswitches. The transient absorption spectra of the microcrystalline powder were measured by femtosecond diffuse reflectance spectroscopy and compared with those in ethanol solution. Similar photochromic reaction occurs in solid s...<br/><br/>T Asahi, H Masuhara, K Nakatani, M Sliwa (2005) <i>Molecular Crystals and Liquid Crystals</i> <i></i> <i><Go to ISI>://WOS:000230579800036 </i> 431: 541-548<br/>

http://publicationslist.org/michel.sliwa/refid14 2008-11-06T12:50:10Z

Two new anil molecules exhibiting photochromism in the crystalline state, N-(4-hydroxy)-salicylidene-amino-4-(methylbenzoate) (2) and N-(3,5-di-tert-butylsalicylidene)-4-aminopyridine (3), are obtained. Upon irradiation in the UV, the yellow crystals change color to red, owing to enol-keto intramolecular tautomerism. The red color disappears, when crystals are left in the dark or irradiated with v...<br/><br/>M Sliwa, S Letard, I Malfant, M Nierlich, P G Lacroix, T Asahi, H Masuhara, P Yu, K Nakatani (2005) <i>Chemistry of Materials</i> <i></i> <i><Go to ISI>://WOS:000231742600025 </i> 17: 18 4727-4735<br/>

http://publicationslist.org/michel.sliwa/refid6 2008-11-06T12:50:10Z

Although being an efficient photochromic compound which absorbs in the blue in its stable form and in the orange in its photoactivated form, the mercury dithizonate complex is shown to be a poor optical limiter for nanosecond laser pulses at the wavelengths where both isomers absorb. Optical limiting effect, which is a consequence of reverse saturable absorption due to the photoactivated form, is ...<br/><br/>P Feneyrou, F Soyer, P Le Barny, E Ishow, M Sliwa, J A Delaire (2003) <i>Photochemical & Photobiological Sciences</i> <i></i> <i><Go to ISI>://WOS:000182082600004 </i> 2: 3 195-202<br/>