Fig 1.
Schematic representation of the tetradentate ligand H2L.
Fig 2.
1H NMR spectra of (a): the free ligand H2L and (b): The Cd-nano complex.
Fig 3.
13C NMR spectrum of the Cd-nano complex.
Table 1.
13C chemical shifts (in ppm) for the free ligand H2L and Cd nano complex.
Fig 4.
SEM image of Cd-nano complex.
Fig 5.
X-ray diffractogram of Cd-nanocomplex.
Fig 6.
Suggested structure of the Cd nano metal complex.
Fig 7.
Optimized structures of 1-hydroxy-2-naphthaldehyde (A), amino-N-(4,6-dimethylpyrimidin-2-yl)-4-benzenesulfonamide (B), the Schiff base ligand H2L (C), and Cd(II) complex conformers (D-G). Conformers D and F exhibit a zwitterionic configuration, while conformers E and G feature a neutral arrangement. Additionally, D and E conformers adopt cis configurations, whereas F and G conformers adopt trans configurations.
Table 2.
Reaction energy (ΔE), enthalpy (ΔH), and free energy (ΔG) for the condensation reaction (Eq 1) and complexation reaction (Eq 2).