Chinese Journal of Applied Chemistry ›› 2018, Vol. 35 ›› Issue (7): 818-824.DOI: 10.11944/j.issn.1000-0518.2018.07.170290

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A Novel Third-Order Non-Linear Optical Ruthenium(Ⅱ) Complex Based on Imidazo-phenanthroline Derivative:Design, Synthesis and DNA Binding Properties

Feng HONG,Yueru YIN,Yupeng TIAN,Jieying WU()   

  1. College of Chemistry & Chemical Engineering,Anhui University,Hefei 230601,China
  • Received:2017-08-18 Accepted:2017-11-24 Published:2018-07-06 Online:2018-07-06
  • Contact: Jieying WU
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.51672002), Student Research Training Program of Anhui University(No.KYXL2016027)


A new D-π-A type two-photon absorption ligand(L) based on imidazo [4,5-f] [1,10] phenanthroline and its Ru(Ⅱ) complex(1) have been synthesized and characterized. The third-order nonlinear optical(NLO) properties of all compounds are studied by open/close aperture Z-scan techniques. The results reveal that complex 1 possesses larger third-order nonlinear susceptibility and two-photon absorption cross section than its free ligand L in the near infrared range. A reverse nonlinear optical refraction character takes place from self-defocusing to self-focusing response after complexation. Calf-thymus DNA binding properties combined with complex 1 are studied by UV-Vis absorption, DNA competitive binding with ethidium bromide, viscosity measurements, and circular dichrosim spectra. The results indicate that complex 1 binds to DNA via an intercalative mode. Therefore, the complex 1 with nonlinear optical properties can be used for bioimaging applications.

Key words: phenanthroline, Ru(Ⅱ) complexes;, third-order nonlinear optical property, DNA binding, two-photon absorption effect