Publication details
The acid-base and complex-forming properties of cytokinins
| Authors | |
|---|---|
| Year of publication | 2026 |
| Type | Peer-reviewed scientific article |
| Magazine / Source | INORGANICA CHIMICA ACTA |
| MU Faculty or unit | |
| Citation | |
| web | https://doi.org/10.1016/j.ica.2026.123178 |
| Doi | https://doi.org/10.1016/j.ica.2026.123178 |
| Keywords | Cytokinins (CKs); 6-(benzylamino)purine derivatives; Protonation/stability constants; Thermodynamic parameters; Ionic strength dependence; Zn(II) complexes |
| Description | The acid-base properties of cytokinin (CK) phytohormones (kinetin and 6-(benzylamino)purine (BAP) derivatives) were studied by means of multiwavelength molecular absorption spectroscopy in aqueous solutions over the temperature range of 25-50 degrees C and at ionic strengths of 0.1-0.3 M. The thermodynamic parameters (Delta H degrees and Delta S degrees) of the protonation processes of the studied CKs were estimated from the temperature dependence of these equilibrium constants. In addition, the protonation constants for the BAP derivatives at infinite dilution were calculated from their dependence on ionic strength. The existence of weak Na+ complexes with the studied ligands was also assumed in aqueous solution. The complexing properties of CK ligands with Zn(II) ions were investigated, and their stability constants were estimated from the shift of their protonation constants determined in the presence of a high excess of metal ion. The LFER demonstrated that the log beta Zn(HL) values corelated with the basicity of the CK ligands. |
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