Bekarek, V. published the artcileCorrelations between proton chemical shifts of hydroxyl groups with intramolecular hydrogen bondings and Hammett substituent constants, Quality Control of 21784-73-6, the main research area is hydrogen bonding intramol; proton chem shift; chem shift proton; shift chem proton; intramol H bonding; hydroxyl group chem shift; Hammett substituent constant.
The dependence of the proton chem. shifts of OH groups on Hammett σ constant is proposed in the form: τ = a + bσ1 + cσ2. bσ1 describes the substituent effect on the proton chem. shift of the OH group across the O-H bond and cσ2 the effect of substituents upon the electron donor involved in the formation of the H bonding. Three series of compounds were used to test the validity of the equation proposed, namely, 0-nitrophenols, salicylaldehydes, and 0-hydroxyazobenzenes. The values of the constant a, b, and c were calculated by the least sqs. method: 0-nitrophenols: -0.57, -1.260, +0.990; salicylaldehydes: -0.93, -1.186, +0.900; and 0-hydroxyazobenzenes: -1.21, -2.040, +2.484. A good agreement was found for substituted 0-nitrophenols. In the case of salicylaldehydes a considerable deviation was found for the 5-NO2 derivative There is an intramol. H bonding under exptl. conditions and such H bonding exists even in 0-hydroxyazobenzene for the data measured in Me2SO.
Collection of Czechoslovak Chemical Communications published new progress about Hydrogen bond. 21784-73-6 belongs to class iodides-buliding-blocks, name is 4-Iodo-2-nitrophenol, and the molecular formula is C6H4INO3, Quality Control of 21784-73-6.
Referemce:
Iodide – Wikipedia,
Iodide – an overview | ScienceDirect Topics – ScienceDirect.com