We report the solvatochromic, viscosity-sensitive, and single-molecule photophysics of the fluorophores DCDHF-N-6 and DCDHF-A-6. These molecules are members of the dicyanomethylenedihydrofuran (DCDHF) class of single-molecule emitters that contain an amine electron donor and a DCDHF acceptor ...

A series of dicyanomethylenedihydrofuran (DCDHF) fluorophores with different hydrophilic groups were synthesized and their photophysical properties and water solubilities were measured. Significant water solubility was achieved without compromising desirable photophysical properties, permitting applications of these fluorophores in ...

There is a persistent need for small-molecule fluorescent labels optimized for single-molecule imaging in the cellular environment. Application of these labels comes with a set of strict requirements: strong absorption, efficient and stable emission, water solubility and membrane permeability, low background emission, and red-shifted absorption to avoid cell autofluorescence. We have designed and ...

A group of new fluorescent dye materials for single-molecule imaging applications comprised of an amine donor, a ?-system comprised of phenyl and thiophene rings and a 2-dicyanomethylene-3-cyano-2,5-dihydrofuran acceptor group have been synthesized. Relative to comparable single-ring compounds these doubly aromatic conjugated fluorophores have red-shifted absorption and ...

A group of new fluorescent dye materials for single-molecule imaging applications comprised of an amine donor, a ?-system comprised of phenyl and thiophene rings and a 2-dicyanomethylene-3-cyano-2,5-dihydrofuran acceptor group have been synthesized. Relative to comparable single-ring compounds these doubly aromatic conjugated fluorophores have red-shifted absorption and ...

- tions in dicyanodihydrofurane (DCDHF) guest�host mix- tures of 40% DCDHF-6-V and 60% Poly(bisphenol

A method comprising reducing an acenequinone to form an acenepolyhydrodiol by exposing the acenequinone to a reducing environment comprising an alkoxyaluminate.

2,7-Dichlorodihydrofluorescein (DCDHF), commonly known as dichlorofluorescin, and dihydrorhodamine 123 (DHR) are often used to detect the production of reactive nitrogen and oxygen species in cells via oxidation to their respective fluorescent products. To determine which biological oxidants might be involved, DCDHF and DHR were exposed to a number of ...

Absorption spectra of n-acenes (n from 2 to 6, for naphthalene, anthracene, tetracene, pentacene, and hexacene, respectively) have been calculated using a newly developed code based on time-dependent density-functional theory. Our calculations show that absorption spectra and charge carrier mobility of acenes not only depend on the molecular identity but ...

... The nature of bonding between the layer of linear acenes, molecules such as tetracene and pentacene that have great potential as organic ...

On the basis of the n-acenes (n = 1, 2, 3 and 4), the ?-Li@n-acenes and ?-Li@n-acenes salts were selected to investigate how increasing the number n of conjugated benzenoid rings affects the linear and nonlinear optical responses. The ?-Li@n-acenes and ?-Li@n-acenes salts are obtained by a ...

... rubidium. Alkaline metal doping of thin films of other acene compounds such as tetracene and hexacene was also performed. ...

The high reactivity of acenes can reduce their potential applications in the field of molecular electronics. Although pentacene is an important material for use in organic field-effect transistors because of its high charge mobility, its reactivity is a major disadvantage hindering the development of pentacene applications. In this study, several reaction pathways for the ...

The sorption course of anthracene (ACENE-3) into Br�nsted-acidic medium pore MFI zeolites was monitored by in situ EPR and diffuse reflectance UV-visible absorption over one year. Weighed amounts of solid ACENE-3 were merely exposed to H(n)ZSM-5 (H(n)(AlO(2))(n)(SiO(2))(96-n)), with the following Br�nsted acid site (BAS) densities, n = 0.0, 0.17, 0.57, ...

Absorption spectra of n-acenes (n from 2 to 6, for naphthalene, anthracene, tetracene, pentacene, and hexacene, respectively) have been calculated using a newly developed code based on time-dependent density-functional theory. Our calculations show that absorption spectra and charge carrier mobility of acenes not only depend on the molecular identity but ...

'informazione tessile in Umbria F.S. 05.01.03.01- A.ACEN.AMMI.ATTNPU.PG603330065; - IFTS " Tecnico superiore della.01.03.01- A.ACEN.AMMI.ATTNPU.TR60333010; - IFTS " Tecnico superiore della trasformazione e della-narnese" F.S. 05.01.03.01.- A.ACEN.AMMI.ATTNPU.TR60333009; DDA. n. 553 Oggetto: Approvazione atti

Mar 4, 2005 ... aCen, alpha Centauri; 36 Oph,. 36 Ophiunchi. Fig. 3. A schematic view of the heliosphere in the case of a BIS inclined with respect ...

Novel bisimide-fused acenes were synthesized via bismuth triflate mediated double-cyclization reaction of acid chlorides and isocyanates. Their optical and electrical properties revealed significantly smaller HOMO-LUMO gaps compared with those of their parent acenes. Fabricated OFET based on tetracene bisimide showed n-type OFET outputs. PMID:21833410

Herein are described the synthesis and characterization of the complexes of formula LAlR (where R = Cl and L = Salen (1), SalenCl (2), Acen (3) and where R = Me and L = Salen (4), SalenCl (5), Acen (6); Salen = N,N'-ethylenebis((2-hydroxyphenyl)methylimine), SalenCl = N,N'-ethylenebis((2-hydroxy-5-chlorophenyl)methylimine), Acen = ...

Recent Advances in Understanding and Development of Photorefractive Polymers and Glasses By Oksana�1 at an applied field of only 25 V lm�1 observed in DCDHF-6-based photorefractive glasses[38 steady-state and dynamical photorefractive performance of these glasses at the wavelength k = 676 nm when

High-performance photorefractive organic glasses: understanding mechanisms and limitations 1 O, monolithic glasses 1. INTRODUCTION The photorefractive (PR) effect is a dynamic refractive index change photorefractive glasses[10] prompted us to extend our exploration to a number of additional DCDHF derivatives.[11

A series of edge-sharing condensed oligopyrazine analogues of acenes, the pyrazinacenes, were synthesized and characterized. X-ray crystallographic determinations revealed intermolecular interactions that affect the propensity of the molecules to undergo pi-pi stacking. Increasing heteroatom substitution of the acene framework induces shorter ...

Acenes have emerged as an important class of organic electronic material. Related heteroatom-substituted compounds, or heteroacenes, introduce an important means for modulating properties and improving materials' stability. In this perspective, we will review the historical origins of the heteroacenes and discuss recent progress in the field of acene and ...

The interaction of a water monomer with a series of linear acenes (benzene, anthracene, pentacene, heptacene, and nonacene) is investigated using a wide range of electronic structure methods, including several "dispersion"-corrected density functional theory (DFT) methods, several variants of the random phase approximation (RPA), DFT-based symmetry-adapted perturbation theory ...

.800,00, graver� sul fondo F.S. 5.1.3.1 A.ACEN.AMMI.ATTNPU.PG60333060. Perugia, 18 settembre 2008 Il Direttore

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Functionalized Higher Acenes: Hexacene and Heptacene Marcia M. Payne, Sean R. Parkin, and John E. L.; Parkin, S. R. Org. Lett. 2002, 4, 15. (b) Maliakal, A.; Raghavachari, K.; Katz, H.; Chandross, E.; Mu�llen, K. Chem. Commun. 1998, 1138. (13) Payne, M. M.; Odom, S. A.; Parkin, S. R.; Anthony, J. E

Acenes (such as pentacene and tetracene) and functionalized acenes (such as rubrene) have demonstrated remarkable electronic properties in thin film devices and in single crystals. Our research effort is directed toward the synthesis of new classes of acene-based compounds that are stable, soluble, and that can be used to probe the ...

Linearly conjugated benzene rings (acenes), belt-shape molecules (cyclic acenes) and model single wall carbon nanotubes (SWCNTs) were fully optimized at the unrestricted level of density functional theory (UB3LYP/6-31G*). The models of SWCNTs were selected to get some insight into the potential changes of NMR chemical shift upon systematic increase of the ...

The present work uses fluorescein as the model fluorophore and points out critical steps in the use of MESF (Molecules of Equivalent Soluble Fluorophores) values for quantitative flow cytometric measurements. It has been found that emission spectrum match...

... One end of branes, the fluorophor was also dissolved in ... The only fluorophor that showed promise branes were conducted with a fiber optic pho- ...

... Abstract : We report synthetic routes for modifying the fluorophore cypate, an indocyanine green (FDA approved) derivative, with custom thiol ...

... separation of individual fluorophores or fluorophore pools present in seawater. ... The oil industry will find this sensor to be an easy and cheap ...

A simple model of the electromagnetic field coupled to matter as a system of coupled quantum harmonic oscillators (QHOs) with a photon number conserving Hamiltonian is specialized to a translationally invariant optical fiber and then equipped with a QHO model for a one-photon fluorophore source. In the narrowband fluorescence limit, this fluorophore model ...

... The formation of inclusion complexes can be followed with the appearance of ... This fluorophore is determined to be an inclusion complex between a ...

We present in vivo measurements of the excitation-wavelength dependence of the autofluorescence of major endogenous fluorophores of human skin with a multiphoton tomograph. For the investigation high-resolution multiphoton images at different depths inside the skin were recorded and the main fluorophores identified. In particular, for the autofluorescence ...

Multiplexed measurements of several analytes in parallel using analyte-sensitive organic fluorophores can be hampered by spectral overlap of the different fluorophores. The authors discuss how nanoparticles can help to overcome this problem. First, different organic fluorophores can be separated spatially by confining them to separate ...

Cyanine fluorophores are commonly used in single-molecule FRET experiments with nucleic acids. We have previously shown that indocarbocyanine fluorophores attached to the 5'-termini of DNA and RNA via three-carbon atom linkers stack on the ends of the helix, orienting their transition moments. We now investigate the orientation of sulfoindocarbocyanine ...

Two phenylboronic acid based saccharide sensors bearing conjugated oligomer fluorophores with linear and cruciform ?-frameworks were synthesized in a modular approach utilizing a Cu-catalyzed alkyne azide cycloaddition (click) reaction. The cruciform fluorophore showed excellent saccharide sensing function under physiological conditions in the mM range, ...

The synthesis and characterization of some linear acene quinones of up to nine fused rings prepared by the Friedel-Craft's reaction of hydroquinone (HQ) and 1,4,9,10 tetrahydroxy anthracene (THA) with pyromellitic dianhydride (PMDA), and fused AlCl/sub 3/, was carried out. The intermediate product of the reaction of THA and PMDA, 1,4 dihydroxy anthraquinone, 6,7 ...

We study the length dependence of electron transport through three families of rigid, ribbonlike molecular wires. These series of molecules, known as polyacene dithiolates, polyphenanthrene dithiolates, and polyfluorene dithiolates, represent the ultimate graphene nanoribbons. We find that acenes are the most attractive candidates for low-resistance molecular-scale wires ...

Electron-phonon interactions in the monocation of corannulene are studied by using the hybrid Hartree-Fock (HF)/density-functional-theory (DFT) method in the Gaussian 98 program package. The C-C stretching mode of 1498 cm(-1) most strongly couples to the e1 highest occupied molecular orbitals (HOMO) in corannulene. The total electron-phonon coupling constant for the monocation (l(HOMO)) of ...

Previously, we developed an iterative elongation methodology to synthesize acene esters, nitriles, and imides. The strategy uses the concept of bidirectional synthesis, and we can now make a series of electron deficient anthracene, tetracene, and pentacene derivatives via the bidirectional iterative elongation protocol. Central units, used to initiate the bidirectional ...

This report is divided into sections appropriate for the four publications which were or will soon be published from this research. Additional references and information can be obtained from these papers. The basic premise behind this work has been, and continues to be, the preparation of stable electronic polymeric conductors, which have reversible, high capacity, oxidation-reduction ...

Organic-inorganic hybrid heterojunctions have potential as the basis for future photovoltaic devices. Herein, we report the results of investigations exploring the possibility of using pentacene and tetracene as photoelectron donors in conjunction with PbS nanocrystals (PbS-NCs). Photoinduced charge transfer was probed using external quantum efficiency measurements on ...

Organic-inorganic hybrid heterojunctions have potential as the basis for future photovoltaic devices. Herein, we report the results of investigations exploring the possibility of using pentacene and tetracene as photoelectron donors in conjunction with PbS nanocrystals (PbS-NCs). Photoinduced charge transfer was probed using external quantum efficiency measurements on ...

We use the finite-difference time-domain method to predict how fluorescence is modified if the fluorophore is located between two silver nanoparticles of a dimer system. The fluorophore is modeled as a radiating point dipole with orientation defined by its polarization. When a fluorophore is oriented perpendicular to the metal surface, ...

We use the finite-difference time-domain method to predict how fluorescence is modified if the fluorophore is located between two silver nanoparticles of a dimer system. The fluorophore is modeled as a radiating point dipole with orientation defined by its polarization. When a fluorophore is oriented perpendicular to the metal surface, ...

We use the finite-difference time-domain method to predict how fluorescence is modified if the fluorophore is located between two silver nanoparticles of a dimer system. The fluorophore is modeled as a radiating point dipole with orientation defined by its polarization. When a fluorophore is oriented perpendicular to the metal surface, ...

We examined the emission intensity and wavelength of 40 nm diameter silver particles covalently coated with organic fluorophores with different absorption and emission wavelengths. The objective of this study is to use the interactions of fluorophores with the plasmon in the metal particles to create the brightest possible probes. We refer to the complexes ...

We examined the emission intensity and wavelength of 40 nm diameter silver particles covalently coated with organic fluorophores with different absorption and emission wavelengths. The objective of this study is to use the interactions of fluorophores with the plasmon in the metal particles to create the brightest possible probes. We refer to the complexes ...

Near-infrared (NIR) fluorescence tomography of multiple fluorophores has previously been limited by the bandwidth of the NIR spectral regime and the broad emission spectra of most NIR fluorophores. We describe in vivo tomography of three spectrally overlapping fluorophores using fluorescence lifetime-based separation. Time-domain ...

Near-infrared (NIR) fluorescence tomography of multiple fluorophores has previously been limited by the bandwidth of the NIR spectral regime and the broad emission spectra of most NIR fluorophores. We describe in vivo tomography of three spectrally overlapping fluorophores using fluorescence lifetime-based separation. Time-domain ...

Near-infrared (NIR) fluorescence tomography of multiple fluorophores has previously been limited by the bandwidth of the NIR spectral regime and the broad emission spectra of most NIR fluorophores. We describe in vivo tomography of three spectrally overlapping fluorophores using fluorescence lifetime-based separation. Time-domain ...

We study the nature of fluorescence scattering by a radiating fluorophore placed near a metal nanoparticle with the finite-difference time-domain method. Angle-resolved light-scattering distributions are contrasted with those that result when ordinary plane waves are scattered by the nanoparticle. For certain sized nanoparticles and fluorophore dipoles ...

5,12-Dicyanonaphthacene and 6,13-dicyanopentacene have been synthesized for the first time. The LUMO and HOMO levels are deepened as predicted and fabricated organic field-effect transistors (OFETs) showed ambipolar responses with carrier mobilities of 10(-3) cm(2)/V�s. PMID:21341719

The rhodium-catalyzed oxidative 1:2 coupling reactions of arylboronic acids or their esters with alkynes smoothly proceed to produce the corresponding annulated products. Of special note, highly substituted, readily soluble, and tractable anthracene and tetracene derivatives can be obtained selectively from 2-naphthyl- and 2-anthrylboron reagents, respectively. PMID:21395298

Human somatic angiotensin I-converting enzyme (sACE) has two active sites present in two sequence homologous protein domains (ACE_N and ACE_C) possessing several biochemical features that differentiate the two active sites (i.e. chloride ion activation). Based on the recently solved X-ray structure of testis angiotensin-converting enzyme (tACE), the 3D structure of ...

Polyaromatic hydrocarbons (PAHs) are a class of organic molecules with importance in several branches of science, including medicine, combustion chemistry, and materials science. The delocalized ?-orbital systems in PAHs require highly accurate electronic structure methods to capture strong electron correlation. Treating correlation in PAHs has been challenging because (i) traditional wave ...

... M. Uhartbc aAsociación para la Conservación y el Estudio de la Naturaleza (ACEN), Iberá 1575 8vo. �B,� Ciudad de Buenos Aires (1429), Argentina (JAP, NGF) bField Veterinary Program, Wildlife ... ...

Density fitting (DF) approximations have been used to increase the efficiency of several quantum mechanical methods. In this work, we apply DF and a related approach, Cholesky decomposition (CD), to wave function-based symmetry-adapted perturbation theory (SAPT). We also test the one-center approximation to the Cholesky decomposition. The DF and CD approximations lead to a dramatic improvement in ...

locust (Gleditsia tria- canthos), and box elder (Acer negundo). Tree sample selection To assess spatial Juniperus virginiana Acer negundo Rhus glabra Gleditsia triacanthos Near Far Near Far Near Far Near Far Near, Cornus drummondii; ACENE, Acer negundo; GLETR, Gleditsia triacanthos; ULMRU, Ulmus ru- bra; JUNVI

Imaging and treating cancer with the same tool. New works advances understanding of sexual chemistry of the Germanic cockroach. Enzymatic reaction unmasks a fluorophore.

Fluorescence detection is a central technology in biological research and biotechnology. A vast array of fluorescent probes are available with diverse spectral properties. These properties were 'engineered' into fluorophores by modification of the chemical structures. Essentially, all present uses of fluorescence rely on the radiation of energy into optically transparent ...

Fluorescence detection is a central technology in biological research and biotechnology. A vast array of fluorescent probes are available with diverse spectral properties. These properties were �engineered� into fluorophores by modification of the chemical structures. Essentially, all present uses of fluorescence rely on the radiation of energy into optically transparent ...

... 5 as fluorophor on the 5? end and Black Hole Quencher� 2 on the 3? end. The REV- ... was modified with 6-FAM as fluorophor and Black Hole Quencher� 1. Multiplex qPCR Multiplex qPCR was done ... ...

A procedure is presented to convert the comparison of measured fluorescence signals into a comparison of fluorescence yields (FY). The fluorescence yield, which is a property of a solution or a suspension, is defined as the product of the fluorophore conc...

We show fluorescence-detected quantum interference in a microscope setup and demonstrate selective enhancement or suppression of fluorophores using femtosecond pulse-pair excitation with periodic modulation of the interpulse phase.

Selective nucleophilic substitution on a perfluorophenyl unit comprising a BODIPY fluorophore using an alkanethiol or a primary amine offers a quantitative fluorophore labelling strategy, while retaining high photostability and emission quantum yields approaching unity. PMID:21853176