Traditional organic compounds in dilute solutions exhibit different photophysical properties in comparison to their concentrated solutions. For example, organic materials which obey the aggregation-caused quench (ACQ) effect phenomena are known to have weak luminescence at solid-state (or in hig...

The effect of the thermal decomposition of calcium hydroxide, in the 500–800 °C range, for CaO production was studied. The produced materials were characterized by X-ray powder diffraction, thermogravimetric analysis, N2 adsorption-desorption at −196 °C, Scanning Electron Microscopy and Diffu...

TPA is known to be a highly sensitive process. Open aperture Z-scan technique has been employed to measure two photon absorption cross section (TPCS) of Rhodamine B and Rhodamine 6G solutions in MeOH. An in depth analysis is carried out to assess the influence of medium as well as laser paramete...

A novel “off-on” terminated polyurethane based on the rhodamine B modified dye RhEA was constructed with the polyethylene glycol (PEG) and 1,4-butanediol (BDO) as soft segment, isophorone diisocyanate (IPDI) as hard segment. The RhEA terminated polyurethane turned to red from colorless after 2...

Time-resolved resonance heterodyne optical Kerr-effect spectroscopy is employed to measure the solvation dynamics of rhodamine 800 in water and D2O. Unlike other large dye molecules, rhodamine 800 solvation dynamics in water exhibits a long-time component which we attribute to hydrogen-bond form...

The determination of fluorescence quantum yields (Φf) of deep red dyes emitting at 635–900 nm is difficult due to lack of suitable standards. In this work, we propose a commercial dye, rhodamine 800 (Rho800), as reference standard which belongs to the family of xanthenes. The quantum yield of ...

Megalomycin C, a natural macrolide antibiotic showed a potent antiherpetic activity. At concentrations that efficiently prevented HSV-1 multiplication, the compound had no cytotoxic or antiproliferative effects. Viral DNA and protein synthesis took place at normal levels in the presence of the a...

The reactions of 3,6-dibromo-2,7-dioxotetracyclo[6.3.0.04,11.05,9]undecane with organomagnesium halides are investigated as a method of preparing unusual tetrasubstituted pentacycloundecanes (D3-trishomocubanes). The tetrasubstituted pentacycloundecanes have been characterized and product geomet...

Application of our original photooxidation–reduction methodology to prenylated dihydroxycoumarin and trihydroxyxanthone compounds led to the corresponding ortho-(2-hydroxy-3-methylbut-3-enyl)phenol derivatives with yields ranging from 8 to 65%. In most of the reported experiments, the oxidation...

The leaves of stevia [Stevia rebaudiana (Bertoni)] are a rich source of steviol glycosides that are used as non-calorific sweetener in many countries around the world. Steviol moiety of steviol glycosides is synthesized via plastidial 2C-methyl-D-erythritol 4-phosphate pathway, where (E)-4-hydro...

Electroactive thiophene substituted polyacetylene derivative, namely poly(2-methylbut-2-enyl thiophene-3-carboxylate) (PMT) was synthesized. First, novel acetylene monomer was synthesized by the reaction of 3-thiophenecarboxylic acid with propargyl bromide and then polymerized with a Rh catalyst...

SummaryIn green algae, the final step of the plastidial methylerythritol phosphate (MEP) pathway is catalyzed by 4-hydroxy-3-methylbut-2-enyl diphosphate reductase (HDR; EC: 1.17.1.2), an enzyme proposed to play a key role in the regulation of isoprenoid biosynthesis. Here we report the isolatio...

A new aryl ketone 1-[2′,4′-dihydroxy-3′-(3″-methylbut-2″-enyl)-5′-(1‴-ethoxy-3‴-methylbutyl)-6′-methoxy]phenylethanone was isolated from the leaves of Acronychia pedunculata. Its structure was determined directly by two-dimensional NMR spectroscopy and by comparison with the known compoun...

Serum albumin is the most abundant protein in the circulatory system. It plays an important role in the transport and deposition of many molecules in the body. The 7-O-β-d-glucopyranosyl-6-(3-methylbut-2-enyl)-5,4′-dihydroxyflavonol (PF) is a glycosylated flavonoid isolated from Ouratea hexasp...

The 4-hydroxy-3-methylbut-2-enyl diphosphate reductase (HDR) is the last step key enzyme of the methylerythritol phosphate (MEP) pathway, synthesizing isopentenyl diphosphate and its allyl isomer dimethylallyl diphosphate, which is important for regulation of isoprenoid biosynthesis. Here the fu...

This work evaluated the activity and ultrastructural and morphological alterations induced by the xanthone 1,3,7-trihydroxy-2-(3-methylbut-2-enyl)-xanthone (C23) isolated from Kielmeyera coriacea against Trypanosoma cruzi. This xanthone had inhibitory activity against the three forms of this pro...

Conventional and functional imidazole-based ionic liquids (abbr. ILs) were mixed based on their advantage and disadvantage on CO2 reduction. Additionally, CO2 absorption effect and regeneration performance of imidazole-based IL mixtures were discussed. It was showed that imidazole-based IL mixtu...

Alzheimer’s disease (AD) is a progressive neurodegenerative disorder with multiple factors associated with its pathogenesis. Our strategy against AD involves design of multi-targeted 2-substituted-4,5-diphenyl-1H-imidazole analogues which can interact and inhibit AChE, thereby, increasing the s...

In order to address the environment pollution problem in the cleaning process of metal, a green corrosion inhibitor with the size of 3–5.5 nm was synthesized from imidazole ionic liquids and citric acid-based carbon dots. The inhibition behaviors of this inhibitor for Q235 steel in 1 M HCl and ...

Quaternization of common N-functionalized imidazoles (vinyl-, allyl-, propargyl-) with pentafluorobenzyl bromide afforded the respective series of differently substituted imidazolium salts. Likewise, chemospecific S- and N-alkylation of the commercial medicinal drug methimazole (1-methyl-3H-imid...