The synthesis of 5-arylazosubstituted bithiophenes and their UV-visible, solvatochromic and nonlinear optical properties (NLO) are described. In agreement with the solvatochromic data and also with the second-order molecular NLO characterization, the new donor-acceptor systems could find application as suitable solvatochromic probes and also as new NLO materials.

In this investigation, influences on solution behavior and solvatochromism caused by the attachment of a 1H,1H,2H,2H-perfluorooctyl side chain onto derivatives well-known Brooker's Merocyanine (BM) chromophore are explored. Starting from either 4-picoline or 2-picoline, corresponding polyfluoroalkylated o- p-BM have been synthesized in three steps. For all dyes, UV–Vis measurements were conduct...

Abstract Silica nanoparticles with embedded fluorescent dyes represent an important class of markers for example in biological imaging. We systematically studied the various incorporation mechanisms xanthene 30–40 nm silica nanoparticles. An parameter was interaction dye matrix material, either by weak electrostatic or strong covalent interactions, which also has implications on stability fluor...

Three BODIPY derivatives substituted at meso position by aryl (phenyl or N,N-dimethylaminonaphthyl) groups and functionalized 2 with electron-withdrawing formyl electron deficient benzimidazole heterocycle were synthesized completely characterized the usual spectroscopic techniques. A comprehensive photophysical study showed a remarkable enhancement of singlet oxygen sensitization quantum yield...

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 linked by a conjugated unit; DCDHF-N-6 and DCDHF-A-6 have naphthalene- and anthracene-conjugated linkers...

A series of five tetracyclic mono azo dyes based on the diazotization 1-amino-8-hydroxynaphthalene-3,6-disulphonic acid and subsequent coupling with substituted (un)sulphonated naphthalene derivatives have been synthesized. The chemical structures were established using UV–visible, IR, NMR as well mass spectrometry. Based number sulphonic other hydrophilic groups they contain, compounds showed ...

As they have been designed to undergo colorimetric changes that are dependent on the polarity of solvents, the majority of conventional solvatochromic molecule based sensor systems inevitably display broad overlaps in their absorption and emission bands. As a result, colorimetric differentiation of solvents of similar polarity has been extremely difficult. Here we present a tailor-made colorime...

The polarity of solutions of LiCIO 4 in acetic acid has been investigated. However, polarity scal4s based on light absorption, e.g. the ~-scale, are interfered by aggregation phenomena of the used ~olvatochromic dyes, whereas solvatochromic fluorescent dyes give proper results. Salt containing solvents are used in mechanistic studies of solvolytic displacement reactions. The special salt effect...