Binary mixtures of organic solvents with limited miscibility are investigated by a two parameter equation which reliably describes the polarity of mixtures as a function of their composition. A relation is found between limited miscibility and critical change of solvent structure. The polarity of liquid mixtures of organic solvents has been quantitatively investigated in preceding papers I-6). ...

A novel series of the title compound 4-(5-arylazo-2-hydroxystyryl)-1-methylpyridinium iodide 6 has been synthesized via condensation reactions of the arylazosalicylaldehyde derivatives 4a-i with 1-methyl-picolinium iodide 5. The structures of the new arylazo compounds were characterized by ¹H NMR, IR, mass spectroscopy, as well as spectral and elemental analyses. The electronic absorption spect...

In this work, a voltage-heating actuated flexible solvatochromic film is developed using the composites of Nafion film-nickel complexes with spray-coated silver nanowires (AgNWs). The nickel complexes, inside through ion exchange, serve as colorable components due to coordination number change water molecules in solvatochromism. color-changing process was characterized experimentally by adjusti...

A series of thirteen 2-acyl-6,7-dihydro-1H,5H-pyrazolo[1,2-a]pyrazole derivatives were synthesized by using a copper-catalyzed azomethine-imine-alkyne cycloaddition as key step. These bimane-related fluorescent compounds with λex = 338–400 nm and λem 522–644 exhibit interesting promising optical properties, including remarkably large Stokes shift (150–268 nm), positive solvatochromism, strong d...

Fourteen dyes based on 2,4,5,7-tetranitrofluorene (TNF) as the electron acceptor have been designed and prepared in a one-step synthesis. By modifying donor, optical properties of could be efficiently tuned an absorption ranging between 450 nm 700 determined by UV–visible spectroscopy. To get deeper insight into properties, solvatochromism fourteen has also examined. For all dyes, positive was ...

In this contribution, we designed a 4,6-distyrylpyrimidine chromophore with diphenylamino electron-donating groups and biphenylenevinylene extended π-conjugated linkers. This compound has been synthesized in two steps from 4,6-dimethyl-2-phenylpyrimidine by double Knoevenagel reaction 4-bromobenzaldehyde followed Suzuki–Miyaura cross coupling 4-(N,N-diphenylamino)phenylboronic acid. exhibits in...

[2.2]Paracyclophanes with chiral ketimine side chains constitute a class of highly versatile and enantioselective ligands for catalytic carbon-carbon bond forming reactions. Proper matching of the side chain and [2.2]paracyclophane configurations induces chiral cooperativity, which is key to high selectivities. Here we show that the absolute configuration of both chirotropic elements may be ful...

Important information about a geometrical transformation of solute molecules undergoing charge transfer in the excited state could be obtained from the knowledge of its dipole moment change in time, while experimental methods allow to obtain only stationary values of dipole moments for both the local excited and the charge transfer states. On the basis of the theory of solvatochromism the relat...

The ability of molecules to change colour on account of changes in solvent polarity is known as solvatochromism and used spectroscopically to characterize charge-transfer transitions in donor-acceptor molecules. Here we report that donor-acceptor-substituted molecular wires also exhibit distinct properties in single-molecule electronics under the influence of a bias voltage, but in absence of s...