abbreviated as DHB-3-MAP, DHB-4-MAP, and DHB-6-MAP were synthesized by the condensation reactions of 2,4-dihydroxy benzaldehyde (DHB) with amino-methyl pyridines (2-amino-3-methylpyridine, 2-amino-4-methylpyridine, and 2-amino-6-methylpyridine), respectively .
Synthesis of Schiff base
metal complexes [SB-M(II)]
The IR spectral data of the Schiff base
ligands and their complexes are given in Table 2.
of ethylenediamine as corrosion inhibitors of zinc in sulphuric acid.
At the alkaline pH, the free primaquine dissociated from the diphosphate salt would enter into reaction with the aldehdye groups of the oxidized polysaccharide leading to the formation of Schiff base
linkage between the drug and the polysaccharide and we expected the covalent immobilization of the drug onto the polymer to be high.
What Birge noticed was that the energy required to shift the counterion in a Schiff base
salt of the right structure is very small.
In the electronic spectra of Schiff base
hard segment PUs, the aromatic bands at 255 and 264 nm are attributed to benzene [pi]-[pi]* transitions, whereas those observed at 315 and 321 nm are assigned to--CH=N--[pi]-[pi]* transitions.
16] Myeong Soon Park, Koon Ha Park, Kun Jun, Seung Rim Shin, Sea Wha Oh, 2002 "Synthesis of 2-(2-, 3-, and 4-pyridyl)benzoxazoles by the reaction of phenolic schiff bases
with thianthrene cation radical" Journal of Heterocyclic Chemistry,Volume 39(6), pp.
The Bio-Rad instrument manual advises users to "let samples stand at 18-28 [degrees]C for at least 10 min to allow Schiff base
removal" (this was increased recently to 15 min).
To the hot ethanolic solution of the appropriate Schiff base
ligand (1mmol, (1a) 0.
The presence of normal Schiff base
bands indicated that these bands were intact in the complexes.
A Schiff base
is a functional group that contains a carbon-nitrogen double bond with the nitrogen atom connected to an aryl or alkyl group but not hydrogen.