Schiff Base Derivatives in Zinc(II) and Cadmium(II) Complexation with the closo-Dodecaborate Anion

A series of Schiff base derivatives, namely N-(4-methoxyphenyl)-1-(1-methylbenzimidazol-2-yl)methanimine (L-1), 4-methoxy-N-[(1-methylbenzimidazol-2-yl)methyl]aniline (L-2), and 2-[(E)-(1-propylbenzimidazol-2-yl)iminomethyl]phenol (L-3), were synthesized. These compounds feature different linker groups, including -CH=N-, -CH2-NH-, and -N=CH-, respectively. During the process of zinc(II) and cadmium(II) complexation in the presence of the closo-dodecaborate [B12H12](2-) anion, it was observed that ligand L-3 underwent degradation. Consequently, two compounds were isolated, [Zn(Bz-NH2)(2)(CH3COO)(2)] and (HBz-NH2)(2)[B12H12]center dot 2CH(3)CN, both containing 1-propyl-2-aminobenzimidazole (Bz-NH2), which is a degraded fragment of the ligand. Several new zinc(II) and cadmium(II) coordination compounds were synthesized and characterized using various physicochemical analysis methods, including elemental analysis, IR, and UV spectroscopy. Additionally, X-ray diffraction and Hirshfeld surface analysis were performed for compounds [Cd(L-2)(2)(CH3CN)(H2O)][B12H12], [Zn(Bz-NH2)(2)(CH3COO)(2)], and (HBz-NH2)(2)[B12H12]center dot 2CH(3)CN, as well as for ligand L-2.

Automated summary

A series of Schiff base derivatives with different linker groups were synthesized and characterized. During the coordination process, ligand L-3 underwent degradation and degradation products were obtained. X-ray diffraction and Hirshfeld surface analysis were performed for structural characterization.