Abstract
Cu(II), Zn(II) and Re(I) complexes have been synthesized with the Schiff base, N′-[1-(2-oxo-2H-chromen-3-yl)-ethylidene]-hydrazinecarbodithioic acid benzyl ester (SBCM-H) which was prepared by condensation of S-benzyldithiocarbazate and 3-acetylcoumarin. The metal complexes were characterized on the basis of various physico-chemical and spectroscopic techniques including elemental analysis and electrochemical studies, and FT-IR, UV–Vis, NMR, EPR and mass spectroscopy. The Schiff base was found to behave as a bidentate ligand coordinating with Cu(II) and Zn(II) in the thiolate form with 1:2 metal to ligand stoichiometry. Crystals suitable for X-ray diffractometry (XRD) were obtained from the reaction of ReCl(CO)5 with SBCM-H forming a centrosymmetric dimeric complex Re2L2(CO)6 linked by Re–S–Re bridges, where S is the thiolate sulfur of the N,S-bidentate ligand. This Re(I) complex is the first metal carbonyl complex with a bidentate dithiocarbazate ligand to have been characterized by XRD. Cytotoxicity assays revealed enhancement of the bioactivity of SBCM-H upon complexation. Both Cu(II) and Re(I) complexes are found to be active against human breast adenocarcinoma cancer cell lines MDA-MB-231 and MCF-7.
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Abbreviations
- Abs:
-
Absorbance
- ACN:
-
Acetonitrile
- CI:
-
Chemical ionization
- CV:
-
Cyclic voltammetry
- DMEM:
-
Dulbecco’s modified Eagle’s medium
- DMF:
-
Dimethylformamide
- DMSO:
-
Dimethyl sulfoxide
- DMSO-d6 :
-
Deuterated dimethyl sulfoxide
- ER:
-
Estrogen receptor
- EPR:
-
Electron paramagnetic resonance
- ESI–MS:
-
Electrospray ionization–mass spectra
- FAB:
-
Fast atom bombardment
- FT-IR:
-
Fourier transform-infrared spectroscopy
- GC–MS:
-
Gas chromatography–mass spectral
- HR-MS:
-
High resolution-mass spectra
- MCF-7:
-
Human breast carcinoma cells expressing nuclear estrogen receptors
- MDA-MB-231:
-
Human breast carcinoma cells not expressing nuclear estrogen receptors
- MS:
-
Mass spectroscopy
- MTT:
-
3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide
- NMR:
-
Nuclear magnetic resonance
- ORTEP:
-
Oak ridge thermal ellipsoid plot
- PBS:
-
Phosphate buffered saline
- Pyta:
-
4-(2-Pyridyl)-1,2,3-triazole
- RP-HPLC:
-
Reversed phase-high performance liquid chromatography
- SBCM-H:
-
N′-[1-(2-Oxo-2H-chromen-3-yl)-ethylidene]-hydrazinecarbodithioic acid benzyl ester
- % T:
-
Percentage of transmission
- TFA:
-
Trifluoroacetic acid
- UV–Vis:
-
Ultraviolet–Visible
- XRD:
-
X-ray diffractometry
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Acknowledgments
Support for the Project came from Universiti Putra Malaysia (UPM), the Ministry of Higher Education (Malaysia), French ANR Blanc 2010, METABACT Grant and the French Infrastructure for Integrated Structural Biology (FRISBI) ANR-10-INSB-05-01. M. L. Low is grateful for the award of an Erasmus Mundus: Maheva Scholarship and a UPM Graduate Research Fellowship (GRF).
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Low, M.L., Paulus, G., Dorlet, P. et al. Synthesis, characterization and biological activity of Cu(II), Zn(II) and Re(I) complexes derived from S-benzyldithiocarbazate and 3-acetylcoumarin. Biometals 28, 553–566 (2015). https://doi.org/10.1007/s10534-015-9831-2
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DOI: https://doi.org/10.1007/s10534-015-9831-2