title: Synthesis, solvatochromaticity and bioactivities of some transition metal complexes with 2-(R-benzylideneamino)-pyridin-3-ol Schiff base derivatives.
abstract: New four Schiff bases are prepared by condensation of 2-amino-pyridin-3-ol with 3, 4-dihydroxy-benzaldehyde (I), 2-hydroxybenzaldehyde (II), 5-bromo-2-hydroxybenzaldehyde (III), and 4-dimethylaminobenzaldehyde (IV). The structures of these compounds are characterized based on elemental analyses (C. H. N), IR and (1)H NMR. Also, the electronic absorption spectra are recorded in organic solvents of different polarity. The solvents are selected to be covered a wide range of parameters (refractive index, dielectric constant and hydrogen bonding capacity). The UV-vis absorption spectra of Schiff base compounds are investigated in aqueous buffer solutions of varying pH and utilized for the determination of ionization constant, pK(a) and activation free energy, DeltaG(*) of the ionization process. The biological activity against bacterial species and fungi as microorganisms representing different microbial categories such as (two Gram-negative bacteria, Eschericha coli and Agrobacterium sp.),three Gram-positive bacteria (Staphylococcus aureus, Bacillus subtlus and Bacillus megatherium), yeast (Candida albicans), and fungi (Aspergillus niger) were studied.
authors.affiliation: Chemistry Department, Faculty of Science, Benha University, Benha, Egypt. isahmed61@gmail.com
authors.forename: I S
authors.initials: IS
authors.lastname: Ahmed
authors.forename: M A
authors.initials: MA
authors.lastname: Kassem
mesh_terms: D000890:Anti-Infective Agents / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D001419:Bacteria / Q000187:drug effects; D001547:Benzaldehydes / Q000737:chemistry*; D002176:Candida albicans / Q000187:drug effects; D005658:Fungi / Q000187:drug effects; D009682:Magnetic Resonance Spectroscopy; D008826:Microbial Sensitivity Tests; D015394:Molecular Structure; D011725:Pyridines / Q000737:chemistry*; D012545:Schiff Bases / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D012997:Solvents / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D028561:Transition Elements / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology
chemical_list: D000890:Anti-Infective Agents; D001547:Benzaldehydes; D011725:Pyridines; D012545:Schiff Bases; D012997:Solvents; D028561:Transition Elements