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Volume 6, Issue 7(Suppl) Med chem
ISSN: 2161-0444 Med chem, an open access journal Stereochemistry 2016
August 18-19, 2016
Page 22
Notes:
conferenceseries.com
Stereochemistry
August 18-19, 2016 Sao Paulo, Brazil
International Conference on
Effect of urea on ion pair formation: The hydrophilic urea effect
We recently focused that urea produces a higher solution polarity and directly affects liophilic colloidal aggregates.
Using 79Br NMR line broadening and solubility data of bis(tri-methyl)-α,ɷ-alkanediammonium, (1-n-1)Br2 (n=2-4)
(bolaform) and tetramethylammonium bromide and perchlorate salts the effect of urea in weakening ion pair association are
investigated. The high association constant of perchlorate with ammonium salts was used to titrate the ammonium-bromide
interactions. Bromide counter ion in bolaform salts derivative having two, three, and four methylene spacers or in tetramethyl
ammonium salts were replaced by perchlorate. Addition of urea leads to the loss of anion selectivity and the new pairs binds
unspecific both anions.
Biography
Mário José Politi is currently a Professor of Biochemistry for under-graduates and Colloid Chemistry for graduates at the Biochemistry department of the Chemistry
Institute at the University of Sao Paulo. He received a Pharmaceutical degree from USP in 1974, a Master’s degree from USP in 1978, and a PhD from Clarkson
University in 1983. After that, he became a full Professor at the Biochemistry department in 2002. He has over 100 publications in international journals in the areas
of Colloids and Photochemistry. His current interests are in new materials, colloid polymers, silanes, siloxanes and nanostructured colloids, colloids, e-surfaces and
surfactants, photo chemistry and photo physics and organic physical chemistry.
Mário José Politi
University of Sao Paulo, Brazil
Mário José Politi, Med chem 2016, 6:7(Suppl)