A fluorescence chemosensor, 2-hydroxy-1-naphthaldehyde azine (HNA) was designed and synthesized for sequential detection of Cu(2+) and biothiols. It was found that HNA can specifically bind to Cu(2+) with 1:1 stoichiometry, accompanied with a dramatic fluorescence quenching and a remarkable bathochromic-shift of the absorbance peak in HEPES buffer. The generated HNA-Cu(2+) ensemble displayed a ...

This work presents an analysis of the structural, electrochemical, and optical properties of a family of triisopropylsilyl end-capped oligothienoacenes (TIPS-Tn-TIPS, n=4-8) by combining cyclic voltammetry, spectroscopic techniques, and quantum-chemical calculations. TIPS-Tn-TIPS compounds form stable radical cations, and dications are only obtained for the longest oligomers (n=7 and 8). Oxidat...

The anti-inflammatory glucocorticosteroid beclomethasone dipropionate was found previously to degrade in human plasma at 37 degrees C to yield beclomethasone 17-monopropionate, beclomethasone 21-monopropionate, and beclomethasone together with three unknown species, D-1, D-2, and D-3. In this paper, we report the isolation of D-2 and D-3 by preparative HPLC and the elucidation of their structur...

The 521-pigment extracted out of the retina of the Tokay gecko has the typical stereospecificity of the vertebrate visual pigments. This is true for the pigment in the chloride-depleted, "blue-shifted" state as well as for the normal pigment with added chloride. While in the chloride-deficient state, pigment regeneration occurred with both 11-cis- and 9-cis-retinals and the regenerated photopig...

Received 06 July 2012, Revised 15 December 2012, Accepted 16 December 2012 -------------------------------------------------------------------------------------------------------------------------------------------Abstract The study focuses on the interaction between morin and Tin(II) and the resulting complex was characterized through various analytical techniques by comparing it with morin. T...

The ground-(S0) and excited-(S) and Ti) state spectra o f seven derivatives o f 9-acetoxy10(4'-acetoxy)phenylanthracene were determined in the region 50000 15000 cm -1 (200 — 660 nm). Comparison o f these spectra to the unsubstituted molecule (anthracene) indicates the presence o f bathochromic shift and the steric effect. The substituents cause changes o f positions of the energy levels (bigge...

The study has focused on the development of a treatment technique and method for dye wastewater, such as an oxidation reduction process. The potentiochromic study of voltage sensitive methylene blue dye was performed in acidic medium at carbon electrodes. It was found that the carbon electrode shows sensitivity and durability for the retardation of dye. From the results it is revealed that the ...

Far-red emitting fluorescent dyes for optical microscopy, stimulated emission depletion (STED), and ground-state depletion (GSDIM) super-resolution microscopy are presented. Fluorinated silicon-rhodamines (SiRF dyes) and phosphorylated oxazines have absorption and emission maxima at about λ≈660 and 680 nm, respectively, possess high photostability, and large fluorescence quantum yields in water...

Measurement of the primary photochemical reaction of iodopsin, a chicken red-sensitive cone visual pigment, was carried out at room temperature by using picosecond (ps) laser photolysis. Excitation of iodopsin with a ps green pulse (pulse width, 21 ps) caused the instantaneous formation of a bathochromic product, which was stable on a ps time scale. This product may correspond to "bathoiodopsin...

The thermally induced self-healing mechanisms in metallopolymers based on bisterpyridine complexes of iron(II) sulfate and cadmium(II) bromide, respectively, were studied by means of combined quantum mechanical/molecular mechanical (QM/MM) simulations and Raman spectroscopy. Two possible healing schemes, one based on a decomplexation of the cross-linking complexes and a second one relying on th...