Dual emission light-emitting dendrimers composed of phosphorescent fac-tris[2-phenylpyridyl]iridium(III) [Ir(ppy)3] cores and thermally activated delayed fluorescence-based (TADF-based) dendrons have been prepared. The TADF-based are designed to green or blue emission. show solvatochromism, with the switching between phosphorescence TADF depending on medium in which measurement is undertaken. T...

In this study, four arylazobenzylidene dyes (a-d) were synthesized with excellent yields in two steps using Knoevenagel condensation and azo-coupling reactions. Absorption spectra of these dyes with different substituents were investigated in organic solvents as a function of solvent polarity. The spectral features of synthesized arylazobenzylidene dyes were described according to azo-hydrazone...

2-N-aminoquinazolines were prepared by consecutive SNAr functionalization. X-ray structures display the nitrogen lone pair of 2-N-morpholino group in conjugation with electron deficient quinazoline core and thus representing electronic push-pull systems. show a positive solvatochromism are fluorescent solution solid state quantum yields up to 0.73. Increase donor strength 2-amino substituent ca...

Non-classical protomerism of Schiff bases offers several advantages; for example, specific interactions in the -C[double bond, length as m-dash]N- linkage can be controlled and differentiated because the interactions are not governed by keto-enol tautomerism. Herein, the pH sensing properties of a new protomeric Schiff base probe () are reported. In particular, among several acids, the probe di...

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...

Emission and UV-vis absorption spectra of (hydrotris(pyrazolyl)borato)(triphenylarsine)copper(I), (CuTpAsPh3), (hydrotris(pyrazolyl)borato)(triethylamine)copper(I), (CuTpNEt3), and (hydrotris(pyrazolyl)borato)(triphenylphosphine)copper(I), (CuTpPPh3), are reported. The spectra of the arsine complex contain low-energy bands (with a band maximum at 16,500 cm(-1) in emission and a weak shoulder ce...

The neurotransmitter serotonin plays a modulatory role in the regulation of various cognitive and behavioral functions such as sleep, mood, pain, depression, anxiety, and learning by binding to a number of serotonin receptors present upon the cell surface. The spectroscopic properties of serotonin and their modulation with ionization state have been studied. Results show that serotonin fluoresc...

We report the structural characterization of vanadyl acetylacetonate in imidazolium room temperature ionic liquids--bbimNTf(2), bmimNTf(2), C(3)OmimNTf(2), bm(2)imNTf(2), bmimPF(6), bmimOTf, bmimBF(4), bmimMeCO(2), bmimMeSO(4), bmimMe(2)PO(4) and bmimN(CN)(2)--and organic solvents. The complex was characterized by visible electronic (Vis) and EPR spectroscopies. VO(acac)(2) shows solvatochromis...

The properties of chiral donor–acceptor systems displaying CPL sign inversion are investigated in solvents different polarity. solvent enables control their deexcitation pathways favoring either locally excited or charge-transfer states.