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- W2019763360 abstract "Abstract The azo containing groups may behave as +R as well as R groups, depending on the electronic requirements of the reaction. The aryl azo group is sufficiently polar for proximity effects to become significant in the ortho position, where its inherent behaviour may be marked by field effects and by even more interaction with side chain [1]. The β-diketoaryl azo compounds were taken as an example (I). The azo group can act as a proton acceptor in hydrogen bonds and the carbonyl oxygen act as a proton acceptor with protonic solvents. The sole interaction with acetone will be the hydrogen bonding between the hydrogen of the OH-group and the oxygen of the solvent molecules to decrease the electron density on the oxygen atoms; similar behaviour is apparent in chloroform with slight increase in the strength of the intra -molecular hydrogen bonding. The 1 L a − 1 A) transition of the phenyl ring was solvent independent. The donor p -OCH 3 substituent with mesomeric and inductive effects properties, where the electron density on the oxygen atoms of the carbonyl groups assists the electron migration from the highest occupied orbitals of the methoxy group of the vacant orbital on the carbonyl group [2]. The intra -molecular hydrogen bonding of the p -NO 2 compounos, mainly with π-π * transition of the chromphoric groups is influenced by charge migration from the O-H group, not affected by non polar solvents. The o NO 2 compounds are affected by increasing the volumes of R 1 and R 2 . The polar solvent molecules are oriented to the polar sites of the solute in the ground state and on excitation, the solvent molecules are in a position to solvate the more stabilized polar excited states. The non-protonated ligands were the counter part for complexation with divalent transition metals in water-alcohol medium. The stability constants of the traced 1:1 chelates proved that the metals behave as π-electron acceptor depending on the nature of the substituents (σ), the dissociation constants of the ligands (pK) and the nature of the solvent (mainly its dielectric constant) [3]." @default.
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- W2019763360 date "1980-01-01" @default.
- W2019763360 modified "2023-09-27" @default.
- W2019763360 title "The role of solvents on the behaviour of some azo compounds" @default.
- W2019763360 doi "https://doi.org/10.1016/s0020-1693(00)92276-x" @default.
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