title: Synthesis, crystal structure and nuclease activity of a Schiff base copper(II) complex.
abstract: A new Schiff base copper(II) complex, Cu(o-VANAHE)(2) (o-VANAHE = 2-(o-vanillinamino)-1-hydroxyethane), has been synthesized and characterized. Single crystal X-ray diffraction results suggest that this complex structure belongs to triclinic crystal system, space group P1 with the following crystallographic parameters: a = 8.819(4) angstroms, b = 10.794(5) angstroms, c = 11.350(5) angstroms, alpha = 70.262(6) degrees, beta = 70.816(6) degrees, gamma = 78.360(6) degrees, V = 955.4(7) angstroms3, Z = 2, D(c) = 1.571 Mg x m(-3), and the final R1 = 0.0393, wR2 = 0.0994 for the observed reflections 2620(I > 2sigma(I)). The molecular geometry is almost coplanar. Viscosity, fluorescence spectroscopy and cyclic voltammetry have been conducted to assess their interaction between this complex and DNA. Results showed that the copper(II) complex can increase DNA's relative viscosity and quench the fluorescence intensity of EB bound to DNA. The adding of DNA to the solution of Cu(o-VANAHE)2 causes a slight decrease in the voltammetric current, as well as a slight shift in the E(1/2) to less negative potential. The interaction between the complex and DNA has also been investigated by submarine gel electrophoresis, interestingly, we found that the copper(II) complex can cleave circular plasmid pBR322 DNA to nicked and linear forms.
authors.affiliation: School of Chemistry and Chemical Engineering, Liaocheng University, No. 34, Wenhua Road, Liaocheng 252059, PR China. lilianzhi1963@yahoo.com.cn
authors.forename: Lian-Zhi
authors.initials: LZ
authors.lastname: Li
authors.forename: Chao
authors.initials: C
authors.lastname: Zhao
authors.forename: Tao
authors.initials: T
authors.lastname: Xu
authors.forename: Hai-Wei
authors.initials: HW
authors.lastname: Ji
authors.forename: Yan-Hong
authors.initials: YH
authors.lastname: Yu
authors.forename: Guang-Qiang
authors.initials: GQ
authors.lastname: Guo
authors.forename: Hui
authors.initials: H
authors.lastname: Chao
mesh_terms: D003300:Copper / Q000737:chemistry*; D018360:Crystallography, X-Ray; D004247:DNA / Q000378:metabolism; D004706:Endodeoxyribonucleases / Q000138:chemical synthesis / Q000737:chemistry* / Q000378:metabolism; D006868:Hydrolysis; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: D009942:Organometallic Compounds; C502914:bis(2-(o-vanillinamino)-1-hydroxyethane)copper(II); D003300:Copper; D004247:DNA; D004706:Endodeoxyribonucleases