Supercritical fluid CO 2 is an alternative solvent for extraction of metals. The solubility parameter of supercritical CO 2 varies with density resembling that of liquid hexane at moderate pressures in the supercritical region to those of chlorinated solvents at very high pressures. By changing density of supercritical CO 2 , the solvation environment of a metal chelate system can vary continuo...

This study reports the formation of solid vanillin/cyclodextrin inclusion complexes (vanillin/CD ICs) with the aim to enhance the thermal stability and sustained release of vanillin by inclusion complexation. The solid vanillin/CD ICs with three types of CDs (α-CD, β-CD, and γ-CD) were prepared using the freeze-drying method; in addition, a coprecipitation method was also used in the case of γ-...

this study presents the influence of hydroxypropyl-β-cyclodextrin (hpbcd) on the aqueous solubility of acyl esters of cyproterone. first, a number of esters of cyproterone were synthesized. then the phase solubility analysis of the compounds in the presence of hpbcd was investigated in phosphate buffer solution at a ph of 7.4. to gain a better understanding of the complexation mechanism, the sy...

Conformational flexibility of cyclen controlled by complexation with Ni( ii ) and Cu( as evidenced structural studies.

The ‘circular economy’ concept envisages deriving the maximum value out of resources and reducing waste to a minimum. In textiles, that includes recovery fiber materials used clothing reusing them in construction new clothes. Processes such as mechanical separation, depolymerization treatment, selective dissolutions individual polymers are applied. We investigate approach nondestructive dissolu...

The present work reports the synthesis and complexation properties of five mixed bridge P=O/P=S cavitands toward N,N-methyl butyl ammonium chloride (1) as prototype guest. The influence of number and position of P=O and P=S groups on the affinity of phosphonate cavitands toward 1 is assessed via ITC titrations in DCE as solvent. Comparison of the resulting Kass values, the enthalpic and entropi...

We consider the complexation of highly charged semiflexible polyelectrolytes with oppositely charged macroions. On the basis of scaling arguments we discuss how the resulting complexes depend on the persistence length of the polyelectrolyte, the salt concentration, and the sizes and charges of the chain and the macroions. We study first the case of complexation with a single sphere and calculat...

The accurate description of the complexation of the CUO molecule by Ne and Ar noble gas matrices represents a challenging task for present-day quantum chemistry. Especially, the accurate prediction of the spin ground state of different CUO-noble-gas complexes remains elusive. In this work, the interaction of the CUO unit with the surrounding noble gas matrices is investigated in terms of comple...

decreased to 2276±288 nm at the end of 120 min having a polydispersity over 0.7 for both of the incubations. Among the CLDC10 and CLDC11 prepared at the highest ratios (1:0.186 w/w) the complexation process was the fastest and the size observed between 2900 nm to 3044 nm remained nearly unchanged with CLDC10, whereas a progressive increase and then decrease was observed with CLDC11. The measure...

1) Concentration determination and isolation of purified fractions of natural thiols and natural acid polysaccharides for trace metal complexation and structural experiments. 2) Determination of conditional stability constants for the complexation of selected B metal ions (such as Ag, Hg, Cd, Cu, Pb) to specific thiolic functional groups in estuarine organic matter, and of A (e.g., Cs, Ba, Th) ...