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In this paper, synthesis and characterization of metal complexes [Cu 2 (L) 3 ]ClO 4 ( 1 ), [Ga(L) 2 ]NO 3 ·2H 2 O ( 2 ) and [In(L) 2 ]NO 3 ·H 2 O ( 3 ) (HL = 2-acetylpyridine N (4)-phenylthiosemicarbazone) was carried out, including elemental analysis, spectral analysis (IR, UV-vis, NMR), and X-ray crystallography. Complex 1 contains one S-bridged binuclear [Cu 2 (L) 3 ] + unit, where two Cu atoms display diverse coordination geometries: one being square planar geometry and the other octahedral geometry. Both 2 and 3 are mononuclear complexes, and the metal centers in 2 and 3 are chelated by two NNS tridentate ligands possessing a distorted octahedral geometry. Biological studies show that all the complexes possess a wide spectrum of modest to effective antibacterial activities and remarkable cytotoxicities against HepG2 cells, and 1 , in particular, with an IC 50 value of 0.19 ± 0.06 μM, is 113-fold and 28-fold more cytotoxic than HL and the antitumor drug mitoxantrone, respectively. In addition, 3 exhibits excellent photoluminescence properties. Upon the addition of 1 equiv of In 3+ ions, a remarkable fluorescence intensity of HL and fluorescent color change (from transparent to light-green) could be observed with 365 nm light, indicating that this ligand may be used as a promising colorimetric and fluorescent probe for In 3+ detection.

medchemcomm

Cu(<scp>ii</scp>), Ga(<scp>iii</scp>) and In(<scp>iii</scp>) complexes of 2-acetylpyridine <i>N</i>(4)-phenylthiosemicarbazone: synthesis, spectral characterization and biological activities

Cu(ii), Ga(iii) and In(iii) complexes of 2-acetylpyridine N(4)-phenylthiosemicarbazone: synthesis, spectral characterization and biological activities