A photo-responsive polymeric azopyridine ligand with metal-complexation sensitivity: application to coordination equilibrium studies on the polymer complexes of a cobalt(ii) Schiff base

2017 ◽  
Vol 8 (4) ◽  
pp. 761-768 ◽  
Author(s):  
T. Suzuki ◽  
T. Moriya ◽  
R. Endo ◽  
N. Iwasaki
Keyword(s):  
Schiff Base ◽  
Metal Complexation ◽  
Dilute Solution ◽  
Equilibrium Studies ◽  
Polymer Complexes ◽  
Coordination Equilibrium

A photo-responsive polymeric azopyridine ligand with complexation sensitivity provided coordination equilibrium for complexation with cobalt salen in a dilute solution.

SBDTC Derived Schiff Base Metal Complexation: Synthesis, Physicochemical, and Spectral Studies with Antibacterial Activity

2020 ◽  
Vol 90 (8) ◽  
pp. 1529-1532
Author(s):  
N. A. Bitu ◽  
S. Hossain ◽  
A. Kader ◽  
M. S. Islam ◽  
M. M. Haque ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Schiff Base ◽  
Base Metal ◽  
Metal Complexation ◽  
Spectral Studies

Polymeric complexes — LXII. Coordination chemistry of supramolecular Schiff base polymer complexes — A review

2016 ◽  
Vol 216 ◽  
pp. 318-329 ◽  
Author(s):  
A.A. El-Bindary ◽  
A.Z. El-Sonbati ◽  
M.A. Diab ◽  
M.M. Ghoneim ◽  
L.S. Serag
Keyword(s):  
Schiff Base ◽  
Coordination Chemistry ◽  
Polymer Complexes ◽  
Base Polymer ◽  
Polymeric Complexes

Schiff base equilibria. IV. N-Methylimines of m- and p-hydroxybenzaldehydes

1966 ◽  
Vol 19 (2) ◽  
pp. 233 ◽  
Author(s):  
RW Green ◽  
RJ Sleet
Keyword(s):  
Schiff Base ◽  
Ionic Strength ◽  
Schiff Bases ◽  
Formation Constants ◽  
Dilute Solution

The formation of Schiff bases between methylamine and m- and p-hydroxybenzaldehydes has been studied by spectrophotometry. Because of overlapping equilibria and ionic strength effects, the formation constants, KF, of the neutral Schiff bases are determined with less precision than for the ortho compound. In dilute solution they are estimated by extrapolation to be 1.0 x 103 and 1.0 x 104, respectively. The formation constants, KA, of the anionic forms of the Schiff bases have been more precisely measured as 1.45 x 102 and 5.52, respectively. The equilibria are compared with those for salicylaldehyde.

scholarly journals Control of 5-aminolaevulinate synthetase activity in Rhodopseudomonas spheroides. Binding of pyridoxal phosphate to 5-aminolaevulinate synthetase

1979 ◽  
Vol 177 (2) ◽  
pp. 661-671 ◽  
Author(s):  
R C Davies ◽  
A Neuberger
Keyword(s):  
Schiff Base ◽  
High Activity ◽  
Pyridoxal Phosphate ◽  
Enzymic Activity ◽  
Synthetase Activity ◽  
Dilute Solution ◽  
Concentrated Solutions ◽  
Active Centre ◽  
Rhodopseudomonas Spheroides ◽  
Low Activity

1. Pyridoxal 5′-phosphate is a cofactor essential for the enzymic activity of aminolaevulinate synthetase from Rhodopseudomonas spheroides. It also aids activation of the low-activity enzyme by trisulphides such as cystine trisulphide, whereas inactivation of enzyme is facilitated by its absence. 2. The fluorescence spectrum of purified high-activity enzyme is that expected for a pyridoxal phosphate–Schiff base, but the firmly bound cofactor does not appear to be at the active centre. In dilute solutions of enzyme this grouping is inaccessible to nucleophiles such as glycine, hydroxylamine, borohydride and cyanide, at pH 7.4. 3. An active-centre Schiff base is formed between enzyne and added pyridoxal phosphate, which is accessible to nucleophiles. Concentrated solutions of this enzyme–Schiff base on treatment with glycine yield apo- and semi-apoenzyme, which can re-bind pyridoxal phosphate. 4. Two types of binding of pyridoxal phosphate are distinguishable in dilute solution of enzyme, but these become indistinguishable when concentrated solutions are treated with cofactor. A change occurs in the susceptibility towards borohydride of the fluorescence of the “structural” pyridoxal phosphate. 5. One or two molecules of cofactor are bound per subunit of mol. wt. 50 000 in semiapo- or holo-enzyme. The fluorescence of pyridoxamine phosphate covalently bound to enzyme also indicates one to two nmol of reducible Schiff base per 7000 units of activity in purified and partially purified samples of enzyme. 6. Cyanide does not convert high-activity into low-activity enzyme, but with the enzyme-pyridoxal phosphate complex it forms a yellow fluorescent derivative that is enzymically active.

Sign in / Sign up

Export Citation Format

Share Document