A sensitive and selective chemiluminogenic probe for palladium

Palladium triggered removal of a propargyl group leads to the cleavage of the 1,2-dioxetane ring, leading to bright chemiluminescence. The reaction of the probe is highly specific for the Pd species, thus the probe described here has considerable potential for practical utility. © The Royal Society of Chemistry.2015

Tetrastyryl-BODIPY-Based Dendritic Light Harvester and Estimation of Energy Transfer Efficiency

Cataloged from PDF version of article.Versatile BODIPY dyes can be transformed into bright near-IR-emitting fluorophores by quadruple styryl substitutions. When clickable functionalities on the styryl moieties are inserted, an efficient synthesis of a light harvester is possible. In addition, clear spectral evidence is presented showing that, in dendritic light harvesters, calculations commonly based on quantum yield or emission lifetime changes of the donor are bound to yield large overestimations of energy transfer efficiency

Heteroleptic Metallosupramolecular Complexes of Bodipy Dyes as Energy Transfer Cassettes

Cataloged from PDF version of article.Bodipy dyes with integral phenanthroline and terpyridine units heteroleptically assemble in the presence of zinc(II) ions to form energy transfer cassettes. These discrete complexes exhibit an approach to modularly designed efficient energy transfer and light harvesting systems through metal ion coordination

Towards unimolecular luminescent solar concentrators: bodipy-based dendritic energy-transfer cascade with panchromatic absorption and monochromatized emission

Cataloged from PDF version of article.Ein in ein Polymer eingebetteter, panchromatischer Bodipy-Absorber mit eingebautem Energiegradienten konzentriert einfallende Sonnenstrahlung an einem endständigen Chromophor und erzeugt so eine monochromatische Emission an den Seiten des Polymer-Wellenleiters (siehe Bild). Dieses besondere Design minimiert Selbstabsorptionsverluste der peripheren Antennen-Einheiten mit einem beeindruckenden S-Faktor von 10 000

Proof of principle for a molecular 1:2 demultiplexer to function as an autonomously switching theranostic device

Cataloged from PDF version of article.Guided by the digital design concepts, we synthesized a two-module molecular demultiplexer (DEMUX) where the output is switched between emission at near IR, and cytotoxic singlet oxygen, with light at 625 nm as the input (I), and acid as the control (c). In the neutral form, the compound fluoresces brightly under excitation at 625 nm, however, acid addition moves the absorption bands of the two modules in opposite directions, resulting in an effective reversal of excitation energy transfer direction, with a concomitant upsurge of singlet oxygen generation and decrease in emission intensity

Novel molecular building blocks based on the boradiazaindacene chromophore: Applications in fluorescent metallosupramolecular coordination polymers

We designed and synthesized novel boradiazaindacene (Bodipy) derivatives that are appropriately functionalized for metal-ion-mediated supramolecular polymerization. Thus, ligands for 2-terpyridyl-, 2,6-terpyridyl-, and bipyridyl-functionalized Bodipy dyes were synthesized through Sonogashira couplings. These fluorescent building blocks are responsive to metal ions in a stoichiometry-dependent manner. Octahedral coordinating metal ions such as Zn II result in polymerization at a stoichiometry corresponding to two terpyridyl ligands to one Zn II ion. However, at increased metal ion concentrations, the dynamic equilibria are re-established in such a way that the monomeric metal complex dominates. The position of equilibria can easily be monitored by 1H NMR and fluorescence spectroscopies. As expected, although open-shell Fe II ions form similar complex structures, these cations quench the fluorescence emission of all four functionalized Bodipy ligands. © 2009 Wiley-VCH Verlag GmbH & Co. KGaA

COMMUNICATION OF MATLAB GUI AND ANSYS MAXWELL: AN EDUCATION TOOL FOR TUBULAR LINEAR GENERATOR

In this study, analytical calculations of a tubular linear generator model are performed by using Matlab Gui for free-piston applications. A training tool including the processes of design of linear generator, sizing with the analytical equations and analyzing with the finite elements methods was suggested. Geometric dimensions in Matlab Gui interface are solved by transferring automatically to finite element model Ansys-Maxwell 2D-rz plane. The results of analytical analysis are in concordance with the results of finite elements.  In addition, Ansys-Maxwell Script and Matlab codes are given in the appendix

Singlet Oxygen Generation with Chemical Excitation of an Erythrosine-Luminol Conjugate

Chemical generation of singlet oxygen under biologically relevant conditions is very important, considering the role played by singlet oxygen in cancer therapeutics. We now demonstrate that a luminol derivative can be chemically excited and transfer the excitation energy to the covalently attached photosensitizer derived from erythrosin. A photosensitizer module, when excited in this manner, can generate singlet oxygen in solution. As hydrogen peroxide is present in a relatively high concentration in cancer cells, singlet oxygen generation through chemical excitation may evolve into an important therapeutic approach. © 2017 American Chemical Society

Tetrastyryl-BODIPY-based dendritic light harvester and estimation of energy transfer efficiency

Versatile BODIPY dyes can be transformed into bright near-IR-emitting fluorophores by quadruple styryl substitutions. When clickable functionalities on the styryl moieties are inserted, an efficient synthesis of a light harvester is possible. In addition, clear spectral evidence is presented showing that, in dendritic light harvesters, calculations commonly based on quantum yield or emission lifetime changes of the donor are bound to yield large overestimations of energy transfer efficiency. © 2012 American Chemical Society

Amplified Chemiluminescence Signal for Sensing Fluoride Ions

Bringing together the concepts of self-immolative linkers and chemiluminogen dioxetane modules, a chemiluminescence-based sensor for fluoride with signal amplification is presented. Signal amplification is obtained by triggering two chemiluminescence events for each reacting fluoride ion that in turn releases two fluoride ions for each ion. As expected, the chemiluminescence signal starts to rise following an induction period. In addition to the analytical potential, this chemical system is also of interest as a demonstration of positive feedback loop character. © 2017 American Chemical Society