Structural, photolysis and biological studies of novel mixed metal Cu(I)-Sb(III) mixed ligand complexes.
Direct reaction of copper(I) halides with triphenylstibine (tpSb) and 2-mercapto-thiazolidine (tzdtH) in 1:1:1 molar ratio, results in the formation of the [CuX(μ2-S)-tzdtH)(tpSb)]2 (X=Cl (1), Br (2) and I (3)) complexes. The complexes have been characterized by melting point, FT-IR, UV-vis, (1)H NMR spectroscopic data and X-ray crystallography. Complexes 1-3 are di-nuclear and they are the first examples of mixed metals (CuSb), mixed ligand (thioamide, stibine and halogen) containing complexes. Two μ2-S (1-3) atoms bridge the two copper(I) ions with tetrahedral geometry. The coordination sphere around copper atoms is completed by one Sb from tpSb and one halogen (chlorine, bromine or iodine) atom. Intermolecular via N-H⋯X (Cl (1) and Br (2)) interactions stabilized the assembly. The short coppercopper bond distances of 3.103 (1), 3.061 (2) and 3.110, 3.108 (3) Ǻ found in 1-3 indicates d(10)-d(10) interaction between metal centers. The complexes exhibit high photo-sensitivity to UVB light. The complexes 1-3 and the already known [Cu(μ2-I)(tpSb)2]2 (4) were tested for their in vitro cytotoxic activity against human cancer cell lines: MCF-7 (breast, estrogen receptor (ER) positive), MDA-MB-231 (breast, estrogen receptor (ER) negative) and MRC-5 (normal human fetal lung fibroblast cells) with sulforhodamine B (SRB) colorimetric assay. Since estrogen receptors (ERs) are located in MCF-7, in contrast to MDA-MB-231 cells, the estrogenic effect of 1-4 on MCF-7 cells was studied by the mean of methylene blue assay. Compound 4 exhibits the highest estrogenic effect. None of 1-4 exceeds the activity of cisplatin against MCF-7 cells, but they are more active than cisplatin towards MDA-MB-231 cells. UVB light increases the effectiveness of complexes on MCF-7 cells which in the case of 4 is up to 28% higher than the corresponding initial complex (without irradiation).
Section of Inorganic and Analytical Chemistry, Department of Chemistry, University of Ioannina, 45110 Ioannina, Greece.
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Tsiatouras
Section of Inorganic and Analytical Chemistry, Department of Chemistry, University of Ioannina, 45110 Ioannina, Greece. Electronic address: cbanti@cc.uoi.gr.
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Banti
Department of Chemistry, A. Mickiewicz University, ul. Umultowska 89b, 61-614 Poznan, Poland.
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Grześkiewicz
Medical Physics Laboratory, Medical School, University of Ioannina, Greece.
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Rossos
Medical Physics Laboratory, Medical School, University of Ioannina, Greece.
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Kourkoumelis
Department of Chemistry, A. Mickiewicz University, ul. Umultowska 89b, 61-614 Poznan, Poland.
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Kubicki
Section of Inorganic and Analytical Chemistry, Department of Chemistry, University of Ioannina, 45110 Ioannina, Greece. Electronic address: shadjika@uoi.gr.
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Hadjikakou
D000965:Antimony / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D004355:Drug Stability; D006801:Humans; D008024:Ligands; D061986:MCF-7 Cells; D008958:Models, Molecular; D008968:Molecular Conformation; D009942:Organometallic Compounds / Q000737:chemistry* / Q000494:pharmacology*; D010782:Photolysis; D017319:Photosensitizing Agents / Q000737:chemistry* / Q000494:pharmacology*
D008024:Ligands; D009942:Organometallic Compounds; D017319:Photosensitizing Agents; D003300:Copper; D000965:Antimony
Copper(I) complexes; Cytotoxic activity; Photo-activated bio-material; Photochemistry; Triphenylstibine and 2-mercpato-thiazolidine