Non-covalent interactions between {N,N′-bis[(2-pyridinyl)methylene]-1, 2-benzenediamine]-bis(nitrato)}Cu(II) with pyridoxine hydrochloride in methanol at T = (298.15, 308.15 and 318.15) K

• Methanolic solution of pyridoxine hydrochloride used as solvent.
• {N,N′-bis[(2-pyridinyl)methylene]-1, 2-benzenediamine]-bis(nitrato)}Cu(II) used as solute.
• Partial molar volumes and viscosity B-coefficients of the solute were determined.
• Weak 1:1 association between the complex and pyridoxine hydrochloride found.
• Non-covalent interactions and Cu(II) complex acts as a net structure maker in the ternary solutions.

Non-covalent interactions between of {N,N′-bis[(2-pyridinyl)methylene]-1, 2-benzenediamine]-bis(nitrato)}Cu(II) with pyridoxine hydrochloride in methanol were investigated by a combination of physico-chemical and spectrophotometric methods at T = (298.15, 308.15 and 318.15) K under ambient pressure. From measured density and viscosity data the apparent molar volume (ϕV  ), the slope (SV∗), standard partial molar volume (ϕV0), standard transfer volume (ΔtϕV0), isobaric apparent molar expansibility (ϕE  ), standard isobaric partial molar expansibility (ϕE0), the viscosity B-coefficient, its temperature derivative (∂B/∂T), solvation number (Sn) were calculated and discussed on the basis of specific or non-specific (solute + cosolute) and (solute + solvent) interactions. Thermodynamics of viscous flow were discussed on the basis of the transition state theory. Spectrophotometric results indicated 1:1 (solute + cosolute) interaction between the complex and pyridoxine hydrochloride.

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