title: Synthesis, structure, DNA/BSA interaction and in vitro cytotoxic activity of nickel(II) complexes derived from S-allyldithiocarbazate.
abstract: Two nickel(II) complexes with formula NiL1 and NiL2 (HL1 = S-allyl-4-methoxybenzylidene hydrazinecarbodithioate, HL2 = S-allyl-1-napthylidenehydrazinecarbodithioate) have been synthesized and characterized by elemental analysis, FT-IR, NMR, UV-vis spectroscopy and ESI mass spectrometry. The crystal structure of complex 1 has been determined by single crystal X-ray diffractometry. Both HL1 and HL2 ligands are coordinated to the metal in thiolate form. In complexes, squareplanar geometry of the nickel is coordinated with two bidentate ligand units acting through azomethine nitrogen and thiolato sulfur atoms. To explore the potential medicinal value of the complexes with calf thymus DNA and bovine serum albumin (BSA) were studied at normal physiological conditions using fluorescence spectral techniques. The DNA binding constant values of the complexes were found in the range from 5.02 × 10(4), 3.54 × 10(4), and the binding affinities are in the following order 1 > 2. In addition, nickel complexes 1 and 2 shows better binding propensity to the bovine serum albumin (BSA) protein, giving a Ksv value 5.8 × 10(4), 4.47 × 10(4) respectively. From the oxidative cleavage of the complexes with pBR322 DNA, it is inferred that the effects of cleavage are dose-dependent. In addition, in vitro cytotoxicity of the complexes assayed against Vero and HeLa cell lines have shown higher cytotoxic activity with the lower IC50 values indicating their efficiency in killing cancer cells even at various concentrations.
authors.affiliation: Department of Chemistry, Coimbatore Institute of Technology, Coimbatore 641 014, India.
authors.forename: Nanjan
authors.initials: N
authors.lastname: Nanjundan
authors.affiliation: Department of Chemistry, Coimbatore Institute of Technology, Coimbatore 641 014, India.
authors.forename: Ponnusamy
authors.initials: P
authors.lastname: Selvakumar
authors.affiliation: Department of Chemistry, Coimbatore Institute of Technology, Coimbatore 641 014, India. Electronic address: narayanasamycit@gmail.com.
authors.forename: Ramaswamy
authors.initials: R
authors.lastname: Narayanasamy
authors.affiliation: The School of Chemical Sciences, Universiti Sains Malaysia, 11800 USM Penang, Malaysia.
authors.forename: Rosenani A
authors.initials: RA
authors.lastname: Haque
authors.affiliation: Department of Chemistry, Karunya University, Karunya Nagar, Coimbatore 641 114, India.
authors.forename: Krishnaswamy
authors.initials: K
authors.lastname: Velmurugan
authors.affiliation: Department of Chemistry, Karunya University, Karunya Nagar, Coimbatore 641 114, India.
authors.forename: Raju
authors.initials: R
authors.lastname: Nandhakumar
authors.affiliation: Department of Microbiology, Periyar University, Salem 636 011, India.
authors.forename: Tamilselvan
authors.initials: T
authors.lastname: Silambarasan
authors.affiliation: Department of Microbiology, Periyar University, Salem 636 011, India.
authors.forename: Ramamurthy
authors.initials: R
authors.lastname: Dhandapani
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000187:drug effects; D002417:Cattle; D002522:Chlorocebus aethiops; D056831:Coordination Complexes / Q000138:chemical synthesis* / Q000737:chemistry / Q000633:toxicity; D018360:Crystallography, X-Ray; D004247:DNA / Q000737:chemistry* / Q000378:metabolism; D053837:DNA Cleavage / Q000187:drug effects; D006367:HeLa Cells; D006801:Humans; D006834:Hydrazines / Q000737:chemistry*; D008968:Molecular Conformation; D009532:Nickel / Q000737:chemistry*; D011485:Protein Binding; D012545:Schiff Bases / Q000737:chemistry; D012710:Serum Albumin, Bovine / Q000737:chemistry* / Q000378:metabolism; D013050:Spectrometry, Fluorescence; D014709:Vero Cells
chemical_list: D056831:Coordination Complexes; D006834:Hydrazines; D012545:Schiff Bases; D012710:Serum Albumin, Bovine; C010877:carbazic acid; D009532:Nickel; D004247:DNA; C427203:calf thymus DNA