Five new Cu(II) complexes [Cu(psa)(phen)] · 3H2O (1), [Cu(psa)(2bpy)] · 0.5H2O (2), [Cu(psa)(2bpy)(H2O)] · 3H2O (3), [Cu(psa)(4bpy)] · H2O (4), and [Cu(psa)0.5(N3)(2bpy)] (5) (H2psa = phenylsuccinic acid, phen = 1,10-phenanthroline, 2bpy = 2,2′-bipyridine, and 4bpy = 4,4′-bipyridine) were ...

A new process has been developed to separate phenylsuccinic acid (H2A) enantiomers, based on the oppositely preferential recognition of hydrophobic and hydrophilic chiral selectors in organic and aqueous phases, respectively, which is named as biphasic recognition chiral extraction (BRCE). BRCE ...

Two new coordination polymers [Cd5(OH)2(psa)4(bpe)(H2O)2]n (1) and [Cd5(psa)5(bpp)(H2O)2]n (2) (H2psa = phenylsuccinic acid, bpe = 1,2-bis(4-pyridyl)ethylene, bpp = 1,3-bis(4-pyridyl)propane) have been synthesized by methods of hydrothermal reaction and their crystal structures determined. In 1,...

This paper deals with the enantioseparation of phenylsuccinic acid (H2A) enantiomers by liquid-liquid reactive extraction using β-CD derivatives as aqueous selectors. Cyclodextrin and its derivatives can interact with guest molecules selectively to form complexes with different stabilities. Cyc...

Sulphidisation xanthate flotation is a common process in dealing with zinc oxide minerals and sulphidisation is the key procedure in the zinc mineral recovery. In this study, the effect of Ca2+ on the sulphidisation flotation of smithsonite was investigated by flotation tests. The results show t...

Considering the lack of lithium resources, sodium- and potassium-ion storage systems possess great potential for large scale energy storage. However, the slow charge storage kinetics of graphite hinders the intercalation of large sodium and potassium ions, leading to low capacity and poor cyclin...

Meat enhancement strategies like sodium tripolyphosphate (STP) are used to improve fresh meat quality attributes like color, water-holding capacity, and tenderness. However, alternatives are necessary because of reduced consumer acceptance of STP. One alternative is potassium carbonate (K2CO3). ...

This work concentrates on the separation mechanism and application of chiral ligand exchange high-speed countercurrent chromatography in enantioseparation of ten racemic aromatic α-hydroxyl acids, including mandelic acid, 2-chloromandelic acid, 4-methoxymandelic acid, 4-hydroxymandelic acid, α...

A resolution method has been elaborated for mandelic acid and 2-chloromandelic acid applying the (R)-(−)-3-(aminomethyl)-5-methylhexanoic acid (Pregabalin) as the resolving agent. The formation of the corresponding diastereomers was kinetically controlled. This observation was rationalized by th...

The racemate and enantiomers of 2-chloromandelic acid were characterized by SS-NMR, XRPD, and FTIR. The binary melting point phase diagram was constructed by DSC (differential scanning calorimetry). The solid-state nature of 2-chloromandelic acid was identified to be a racemic compound. The crys...

Due to a relatively small size of bile acid salts, their mixed micelles with nonionic surfactants are analysed. Of the special interests are real binary mixed micelles that are thermodynamically more stable than ideal mixed micelles. Thermodynamic stability is expressed with an excess Gibbs ener...

Direct leaching of sphalerite has been considered as a cost effective and an environmentally benign alternative to the traditional two-step roasting-leaching approach. Yet the slow leaching rate due to the formation of surface passivating phases remains the main challenge. Here, we studied the m...

A new analogue of the proline derived organocatalyst ‘pyrrolidine-HOBt’ has been designed and synthesized from l-prolinol and hydroxybenzotriazole (HOBt) employing a simple reaction protocol. The catalyst was found to be effective in promoting the asymmetric Michael addition of cyclohexanone t...

The UDFT method has been successfully applied to study the thermal conversion of Z-1,3-hexadien-5-yne, 1 to benzene, 4. UB3LYP calculations give excellent agreement with available experimental energy values. A four-step mechanism is predicted. The results are compared with the previous studies. ...

Ab initio calculations at the MRCI//ROHF/6-31G** level show that the barrier for isomerization of the 1,3-hexadien-5-yne radical cation to nonclassical structures with a five-membered ring and an exocyclic CH bond is about 15 kcal mol−1. The barrier for a subsequent isomerization to the benzene ...

The isomerization of the 1,3-hexadien-5-yne radical cation to the benzene structure, which is known to have a low energy barrier, is studied by charge exchange ionization. Unexpectedly, no simple relation between the recombination energy of the reactant ion and the fraction of isomerized ions co...

The blue-shifting intramolecular CH⋯π hydrogen bonds (H-bonds) in conformer I of 1,3-hexadien-5-yne (13HD5Y) and its halogen-substituted derivatives are explored by theoretical calculations. The geometric analysis indicates that the CH bond in conformer I is shortened in comparison with the non...

NIR-FT Raman and FT-IR spectra of 6-chloroflavone were recorded and analyzed. The vibrational wavenumber of the compound have been computed using B3LYP/6-31++G(d,p) level to derive the equilibrium geometry, conformational stability, molecular orbital energies and vibrational wavenumbers. The car...

In this paper, we synthesized a novel Re(I) complex of Re(CO)3Br(PBI-Cab) owing a diamine ligand of 9-(4-(2-(pyridin-2-yl)-1H-benzo[d]imidazol-1-yl)butyl)-9H-carbazole (PBI-Cab), where the carbazole moiety was connected by an alkyl chain, hoping to realize an optical sensor immune to surrounding...

Microporous polyurethane elastomer, based on diphenylmethane diisocyanate (MDI) and polyester polyol-Bayflex 2003E has been converted into a liquid by treatment with diethyl phosphonate and tris(1-methyl-2-chloroethyl) phosphate. The structure of the degraded products has been studied by 1H, 13C...