A novel hydrazone, formed by the condensation of the hydrochloride salt of hydralazine with 3-chlorobenzaldehyde, and its Co (II), Ni(II), Cu(II) and Zn(II) complexes have been synthesized. Their structures have been elucidated on the basis of elemental analyses, conductance measurements, magnetic moments, and spectral (infrared, 1 H NMR, UV-visible, electrospray ionization (ESI) mass) and thermal studies. The bidentate behaviour of the ligand is proposed on the basis of spectral studies. Interestingly, all four complexes exhibit different geometry around the metal centre. The conductance data of the complexes suggest them to be non-electrolytes. The ESI mass spectra of the complexes support their monomeric nature. The compounds were tested against two Gram-positive and three Gram-negative bacterial strains and three fungal strains. Excellent inhibitory activity is observed against the Gram-positive bacteria Streptococcus mutans and Enterococcus faecalis which play major roles in tooth decay. Among the fungal strains used, Candida albicans is inhibited predominantly.
2,4-Dichlorophenoxyacetic acid derived Schiff base (HL) and its lanthanide [La(III), Pr(III), Nd(III), Sm(III), Eu(III), Gd(III), Dy(III), Y(III)] complexes were synthesized and characterized by various spectroscopic ( 1 H, 13 C, DEPT and 2D HMQC NMR, FT-IR, �V-Vis, and mass) techni�ues and other analytical methods. HL exhibits �E� and ��� isomerism and was con�rmed by variable temperature 1 H NMR studies. e spectral and analytical data reveals the bidentate coordination of HL to lanthanide(III) ion, through carboxylic acid group via deprotonation. Fluorescence spectrum of europium complex shows bands at 578, 592, and 612 nm assignable to 5 D0 → 7 F0, 5 D0 → 7 F1, and 5 D0 → 7 F2, respectively. Auxin activity of HL and lanthanum(III) complex on wheat seeds (Triticum durum) was measured at different concentrations. e percentage germination, root length, and shoot length were recorded. An enhancement in the plant growth activity of the ligand was observed on complexation and the best activity was observed at 10 −6 M concentration.
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