title: Synthesis, characterization, thermal behavior, and DNA-cleaving studies of cyano-bridged nickel(II)-copper(II) complexes of 4-(pyridin-2-ylazenyl)resorcinol.
abstract: We present here the syntheses of a mononuclear Cu(II) complex and two polynuclear Cu(II)-Ni(II) complexes of the azenyl ligand, 4-(pyridin-2-ylazenyl)resorcinol (HL; 1). The reaction of HL (1) and copper(II) perchlorate with KCN gave a mononuclear complex [CuL(CN)] (4). Using 4, one pentanuclear complex, [{CuL(NC)}(4) Ni](ClO(4))(2) (5) and one trinuclear complex, [{CuL(CN)}(2) NiL]ClO(4) (6), were prepared and characterized by elemental analyses, magnetic susceptibility, molar conductance, IR, and thermal analysis. Stoichiometric and spectral results of the mononuclear Cu(II) complex indicated that the metal/ligand/CN ratio was 1 : 1 : 1, and the ligand behaved as a tridentate ligand forming neutral metal chelates through the pyridinyl and azenyl N-, and resorcinol O-atom. The interaction between the compounds (the ligand 1, its Ni(II) and Cu(II) complexes without CN, i.e., 2 and 3, and its complexes with CN, 4-6) and DNA has also been investigated by agarose gel electrophoresis. The pentanuclear Cu(4) Ni complex (5) with H(2) O(2) as a co-oxidant exhibited the strongest DNA-cleaving activity.
authors: Department of Chemistry, Nevşehir University, TR-50300, Nevşehir. fkaripcin@nevsehir.edu.tr
authors: Fatma
authors: F
authors: Karipcin
authors: Ismail
authors: I
authors: Ozmen
authors: Burcin
authors: B
authors: Cülü
authors: Umut
authors: U
authors: Celikoğlu
mesh_terms: D003300:Copper / Q000737:chemistry*; D004247:DNA / Q000737:chemistry*; D004055:Differential Thermal Analysis; D004587:Electrophoresis, Agar Gel; D006861:Hydrogen Peroxide / Q000737:chemistry; D008024:Ligands; D015394:Molecular Structure; D009532:Nickel / Q000737:chemistry*; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D012118:Resorcinols / Q000737:chemistry; D013055:Spectrophotometry, Infrared
chemical_list: D008024:Ligands; D009942:Organometallic Compounds; D012118:Resorcinols; D003300:Copper; D009532:Nickel; D004247:DNA; D006861:Hydrogen Peroxide; C031389:resorcinol