Results 21 to 30 of about 3,274,216 (342)
Chemistry, 2020 A quantitative Lewis acidity/basicity scale toward boron‐centered Lewis acids has been developed based on a set of 90 experimental equilibrium constants for the reactions of triarylboranes with various O‐, N‐, S‐, and P‐centered Lewis bases in ...
R. Mayer, N. Hampel, A. Ofial
semanticscholar +1 more source
Química Nova, 2009 The pKa values of the 6-[2´-(6´-methyl-benzothiazolylazo)]-1,2-dihydroxy-3,5-benzenedisulfonic acid (Me-BDBD) have been determined at 25 °C, in 0.10 mol L-1 NaCl medium by spectrophotometric method.
Regina Terumi Yamaki +5 more
doaj +1 more source
Determination of the pKa for caffeic acid in mixed solvent using the net analyte signal method and ab initio theory [PDF]
Journal of the Serbian Chemical Society, 2019 Due to the biological effects of phenolic acid components, polyphenol-rich foods are a significant part of human and animal diets. In this study, the acidity constants of caffeic acid (3,4-dihydroxycinnamic acid) in binary mixtures of ethanol–water were ...
Dadras Abbas +6 more
doaj +1 more source
The ammonolysis of esters in liquid ammonia [PDF]
, 2013 The rates of ammonolysis of alkyl benzoate and phenylacetate esters in liquid ammonia increase with the acidity of the leaving group alcohol and show relatively large Brønsted βlg values of −1.18 and −1.34, respectively, when plotted against the aqueous ...
Atherton, John +2 more
core +1 more source
Spectrophotometric Determination of Acidity Constants of Thiamine in Water, Water-Triton X-100 Micellar Media Solutions [PDF]
Iranian Journal of Chemistry & Chemical Engineering, 2008 In this work the acidity constants of Thiamine in water and water-Triton X-100 micelle media solutions, at 25 °C, have been determined spectrophotometrically.
Mohammad Goodarzi, Tahmineh Goodarzi
doaj
Acidity of edge surface sites of montmorillonite and kaolinite [PDF]
, 2013 Peer ...
Cheng, Jun +5 more
core +1 more source
Spectrophotometric Determination of Acidity Constants of Some Anthraquinone Derivatives in Methanol-Water Mixtures [PDF]
Iranian Journal of Chemistry & Chemical Engineering, 1999 A spectrophotometric method is used to determine the acidity constants of some derivatives of 9,10-anthraquinone in binary methanol-water mixtures at 25 °C. There is a linear inverse relationship between pKa of all acids and the mole fraction of methanol
Mohammad Mahdi Khodaei +1 more
doaj
Journal of Lipid Research, 1992 Cholic acid, deoxycholic acid, chenodeoxycholic acid, and ursodeoxycholic acid were purified by a foam fractionation method. Using thermogravimetric analysis, the attached water molecule was found to be completely removed from solids of the latter three ...
Y Moroi, M Kitagawa, H Itoh
doaj +1 more source
pH-Mediated Regulation of Polymer Transport Through SiN Pores [PDF]
, 2018 We characterize the pH controlled polymer capture and transport thorough silicon nitride (SiN) pores subject to protonation. A charge regulation model able to reproduce the experimental zeta potential of SiN pores is coupled with electrohydrodynamic ...
Ala-Nissila, Tapio, Buyukdagli, Sahin
core +2 more sources
CIT-5: a high-silica zeolite with 14-ring pores [PDF]
, 1997 The synthesis and structure of a new zeolite, CIT-5 (California Institute of Technology Number Five), is described, which possesses one-dimensional pores comprised of 14 T-atoms (tetrahedrally coordinated silicon or aluminium atoms)
Katsuyuki Tsuji +6 more
core +1 more source