Molecular structures and properties of the complete series of bromophenols: Density functional theory calculations.
The complete series of 19 bromophenols have been studied by density functional theory (DFT) calculations at the B3LYP/6-311G++(d,p) level. The molecular structures and properties of bromophenols are strongly influenced by intramolecular hydrogen bonding of ortho-bromine, steric and inductive effects of substituted bromine, and other intramolecular electrostatic interactions. Systematic trends in several structural parameters and molecular properties of bromophenols have been found with the increasing number of bromine substitutions, including increase in O-H bond length, decrease in C-O bond length, red shift in O-H stretching frequency, and blue shift in O-H torsional frequency. Correlations among several key molecular parameters as well as those with available aqueous pKa values are examined. Comparisons with chlorophenols have indicated that the inductive effect of substituted bromine appears larger and bromophenols are slightly stronger acids than chlorophenols.
Han
Jun
J
Department of Chemistry and Biochemistry, California State University, Fullerton, California 92834, USA.
Lee
Hyunji
H
Tao
Fu-Ming
FM
D001966:Bromine / Q000737:chemistry*; D015394:Molecular Structure; D010636:Phenols / Q000737:chemistry* / Q000145:classification; D011789:Quantum Theory; D013816:Thermodynamics
D010636:Phenols; C032038:2-bromophenol; D001966:Bromine