Zeolitic imidazolate frameworks MAF-5 and MAF-6 based on Zn2+ 2-ethylimidazole were demonstrated to be efficient heterogeneous catalysts in solvent-free coupling of CO2 propylene oxide (PO) produce carbonate (PC) at 0.8 MPa 80 °C. Activity was lower comparison with due the difference their structural textural characteristics. samples particle size 190 ± 20, 360 30, 810 30 nm prepared room tempe...

A rapid, sensitive, and reliable method was developed for the simultaneous determination of magnesium L-ascorbyl-2-phosphate (AS-PM) and kojic acid (KA), commonly using bleaching agents in cosmetic products. The method uses a prepacked C18 microbore column for ion-pair liquid chromatography with photodiode array detection. The eluant is 0.5mM tetrabutylammonium bromide and 0.05M phosphate buffe...

the complex formation reaction between iodine with tetrabutylammonium halides (tbax) has been studied spectrophotometrically in chloroform solution at 25ºc. various aspects of the spectra of iodine in the presence of various concentration of different tetrabutylammonium halides have been discussed in terms of electronic specifications of iodine and halides. in the case of tetrabutylammonium iod...

Cell-penetrating peptides (CPPs) are short 8-30 amino-acid oligopeptides that act as effective transducers of macromolecular cargo, particularly nucleic acids. They have been implemented in delivering dsDNA, ssDNA, and dsRNA into animal and plant cells. CPPs and nucleic acids form nano-complexes that are often 100-300 nm in size but still effectively transit the cell membrane of animal cells, b...

Hydrofluorocarbons (HFC) are fluorinated compounds used globally for refrigeration. These gases have been shown to contain a greenhouse potential of up 22,000 times that CO2. Thus, 1298 type-5 deep eutectic solvents (DES) were examined the absorption and interaction mechanisms difluoromethane (R32), due their non-polar attributes. Of these solvents, quaternary ammonium salts mixed with various ...

Abstract Direct mixing (de novo) and Solvent Assisted Ligand Exchange (SALE) are the main methods used for synthesis of Mixed-Linker Zeolitic Imidazolate Frameworks (ML-ZIFs). ML-ZIFs with combined –NO 2 –Br/–Cl functionalities were prepared via both synthetic routes. Thereafter CO uptake compared, as well their abilities to fixate epoxide substrates. The de novo resulted in SOD topologies, 60:...

This study investigated the effects of four structurally different quaternary ammonium salts (QASs), i.e., tetrabutylammonium tetrafluoroborate [TBA][BF4], tetrahexylammonium tetrafluoroborate [THA][BF4], tetrabutylammonium hexafluorophosphate [TBA][PF6], and tetrahexylammonium hexafluorophosphate [THA][PF6], on the growth and development of three weed species: gallant soldier (Galinsoga parvif...