ABSTRACT. For lump and nanocobalt sulfate (CoSO4) in pure water, the affiliation thermodynamic association characteristics were measured at 298.15, 303.15, 308.15, 313.15 K. Based on bulk nano CoSO4 molar conductance, estimates made for parameters of solvation, such as activity coefficient, free energy association, enthalpy constant, entropy association. We discussed about each these solvation ...

The technique used previously to observe complex formation between bacitracin, Mg++, and Ca5-isoprenyl pyrophosphate has been employed to measure association constants. The constant for the bacitracin A, Mg++, C55-isoprenyl pyrophosphate complex was lo6 M-I. The binding constants for other bacitracin peptides were lower and correlated with their antibiotic activities. &farnesyl pyrophosphate al...

Charge-transfer (CT) π-complexes are formed between planar porphyrins and 1,4,5,8,9,12-hexaazatriphenylene (HAT) derivatives with large formation constants (e.g., 104 M-1), exhibiting broad CT absorption bands. The unusually large formation constants result from close face-to-face contact between two planar π-planes of porphyrins and HAT derivatives. The redox potentials of porphyrins and HAT d...

Since the pH is treated as an independent variable in biochemical thermodynamics, the Gibbs energy G does not provide the criterion for equilibrium, but the transformed Gibbs energy G’ does. The standard transformed Gibbs energy of formation DfG’ of a reactant (sum of species) can be calculated at the desired temperature, pH, and ionic strength if the standard Gibbs energies of formation DfG an...

A large number of different polymers have been developed and studied for application as DNA carriers for non-viral gene delivery, but the DNA binding properties are not understood. This study describes the efficiency of nanoparticle formation by time-resolved fluorescence measurements for poly(β-amino esters), cationic biodegradable polymers with DNA complexation and transfection capability. Fr...

The interaction of diphenyltin(IV) with selected bioligands having a variety of model functional groups were investigated using the potentiometric technique. The hydrolysis constants of diphenyltin(IV) cation and the step-wise formation constants of the complexes formed in solution were calculated using the non linear least-squares program MINIQUAD-75. The participation of different ligand func...

The radiation-chemicalreduction of TlC, Co2C and Ni2C ions in water-in-oilmicroemulsion has been described. Rate constants for the reduction of the metal ions by eaq were found to be much lower compared to those in aqueous solution. The absorption spectrum and the rate constants of formation of the transient intermediates of metal clusters were correlated with the water-pool size, surrounding e...

Equilibrium constants have been measured potentiometrically for the mixed-ligand complexes, copper (U)-amines (A)-dipeptides (L). The aromatic amines (A) used are 5-nitro-l,lO-phenanthroline (Nphen), 2,2'-pyridyl benzimidazoline (pybz), 1,lO-phenanthroline (phen) and 2,2'-pyridyl imidazoline (pyz). The dipeptides used are glycylglycine (gg), glycyl-l-alanine (ga) and glyeyl-l-Ieucine (gl), The ...

Equilibrium studies in aqueous solution are reported for dibutyltin(IV) (DBT) complexes of the zwitterionic buffers "Good's buffers" Mes and Mops. Stoichiometric and formation constants of the complexes formed were determined at different temperatures and ionic strength 0.1 mol·L-1 NaNO3. The results show that the best fit of the titration curves were obtained when the complexes ML, MLH-1, MLH-...

Rate and activation parameters for the complex-formation reaction of Ni(2+) with 4-(2-pyridylazo)-N,N-dimethyl aniline (PADA) were studied as a function of pH in different buffers in both aqueous and sodium dodecyl sulfate (SDS) micelle solutions. In aqueous Tris buffer solution, the forward and backward rate constants increased with increasing pH, while the complex-formation constant decreased...