scholarly journals Study of formation constant of schiff base containing Thiazole ring in mixed solvent media and their thermodynamic parameters

2020 ◽  
Vol 8 (2) ◽  
pp. 31-34
Author(s):  
BN Muthal
Keyword(s):  
Schiff Base ◽  
Thermodynamic Parameters ◽  
Formation Constant ◽  
Mixed Solvent ◽  
Thiazole Ring

scholarly journals Potentiometric and spectrophotometric studies of the complexation of Schiff-base hydrazones containing the pyrimidine moiety

2003 ◽  
Vol 68 (10) ◽  
pp. 729-749 ◽  
Author(s):  
H.S. Seleem ◽  
B.A. El-Shetary ◽  
S.M.E. Khalil ◽  
M. Shebl
Keyword(s):  
Schiff Base ◽  
Ionic Strength ◽  
Thermodynamic Parameters ◽  
Stability Constants ◽  
Elemental Analysis ◽  
Mass Spectra ◽  
Dissociation Constants ◽  
The Stability ◽  
Pyrimidine Moiety ◽  
Metal Ligand

Three Schiff-base hydrazones (ONN ? donors) were prepared by condensation of 2-amino-4-hydrazino-6-methylpyrimidine with 2-hydroxyacetophenone 2-methoxybenzaldehyde and diacetyl to yield 2-OHAHP, 2-OMeBHPand DHP respectively. The structures of these ligands were elucidated by elemental analysis, UV, IR, 1H-NMR and mass spectra. The metal?ligand stability constants of Mn2+, Fe3+,Co2+,Ni2+,Cu2+, Zn2+,Cd2+,UO22+ and Th4+ chelates were determined potentiometrically in two different media (75%(v/v) dioxane?water and ethanol?water) at 283, 293, 303 and 313 K at an ionic strength of 0.05 M (KNO3). The thermodynamic parameters of the 1:1 and 1:2 complexes were evaluated and are discussed. The dissociation constants of 2-OHAHP, 2-OMeBHP and DHPligands and the stability constants of Co2+, Ni2 and Cu2+ with 2-OHAHP were determined spectrophotometrically in 75 % (v/v) dioxane?water.

Schiff base equilibria. VI. n- and t-Butylimines of pyridine-2-aldehyde

1968 ◽  
Vol 21 (10) ◽  
pp. 2427 ◽  
Author(s):  
RW Green ◽  
MJ Rogerson
Keyword(s):  
Schiff Base ◽  
Schiff Bases ◽  
Formation Constant ◽  
Equilibrium Constants

Equilibrium constants at 25� have been measured for the formation of Schiff bases of pyridine-2-aldehyde with n-butylamine (1.45 x 108) and t-butylamine (93). The Schiff base of salicylaldehyde with t-butylamine has a formation constant 9.1 x 108 and pK 13.0.

Schiff base equilibria. V. Beryllium complexes of N-ethylsalicylideneimine

1966 ◽  
Vol 19 (11) ◽  
pp. 2101 ◽  
Author(s):  
RW Green ◽  
RJ Sleet
Keyword(s):  
Schiff Base ◽  
Distribution Coefficient ◽  
Stability Constants ◽  
Formation Constant ◽  
Mixed Complex ◽  
High Ph ◽  
The Stability ◽  
Hydrolysis Of ◽  
Beryllium Complexes

The formation constant and pK at 25� of the Schiff base N- ethylsalicylideneimine (HL) have been found by spectrophotometry to be 2.75x104 and 11.8 respectively. The distribution coefficient of the base from water into toluene is 160. The stability constants of the beryllium complexes determined by solvent distribution are logβ1 10.4 and log β2 18.3, and the distribution coefficient of BeL2 is 260. At high pH the equilibria are complicated by hydrolysis of the Be2+ ion and by formation of the mixed complex, BeL(OH)-2. The latter is formed according to the reaction BeL(H2O)+2 ↔ BeL(OH)-2+2H+ with logKm2 -18.4.

scholarly journals Evaluation of the physical parameters of nano-sized tetrachlorosilane as an inorganic material a mixed solvent using Fuoss-Shedlovsky and Fuoss-Hsia-Fernández-Prini techniques

2020 ◽  
Vol 10 (4) ◽  
pp. 5741-5746
Keyword(s):  
Thermodynamic Parameters ◽  
Association Constant ◽  
Inorganic Material ◽  
Mixed Solvent ◽  
Electrical Conductance ◽  
Molar Conductance ◽  
Energy Of Activation ◽  
Physical Parameters ◽  
Walden Product ◽  
Limiting Molar Conductance

The electrical conductance of nano-sized tetrachlorosilane is measured in 50% mixed solvent of (absolute ethanol-H2O) at various temperatures. The Λ0 (limiting molar conductance) and the KA (association constant) are evaluated via using Fuoss-Shedlovsky (F-SH) and Fuoss-Hsia-Fernández-Prini (FHFP) theories. The standard thermodynamic parameters for association (ΔS°A, ΔH°A& ΔG°A), energy of activation (Ea), hydrodynamic radii (RH) and Walden product (Λ0 η0) are calculated for tetrachlorosilane. These various physical parameters for tetrachlorosilane are evaluated and discussed.

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