Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (05): 1195-1201.doi: 10.3866/PKU.WHXB20100336

• THERMODYNAMICS,THERMOCHEMISTRY AND SOLUTION CHEMISTRY • Previous Articles     Next Articles

Synthesis and Characterization of Novel Salen-Type Complexes and Their Axial Coordination Thermodynamics

GUO Li-Qin, SHI Xiu-Li, RUAN Wen-Juan, ZHANG Xiao-Hong, ZHU Zhi-Ang   

  1. College of Chemistry, Nankai University, Tianjin 300071, P. R. China
  • Received:2009-10-15 Revised:2009-12-07 Published:2010-04-29
  • Contact: RUAN Wen-Juan E-mail:wjruan@nankai.edu.cn

Abstract:

Four novel Salen-type mono-and bi-nuclear complexes were synthesized by a metal template method, and were characterized by elemental analyses, hydrogen nuclear magnetic resonance (1H NMR), electrospray ionization mass spectroscopy (ESI-MS), Fourier transforminfrared (FT-IR) spectroscopy, ultraviolet-visible (UV-Vis) spectroscopy, and circular dichroism(CD)spectroscopy. The thermodynamic behavior of the Salen-type Ni (II) complexes were studied by UV-Vis and CD spectra. We found that the coordination numbers for imidazole (Im) and N-methylimidazole (N-MeIm)were 2, but for 2-Et-4-MeImand 2-MeImthey were 1. The association constants of the systems decrease according to the following order: KΘ(Im) >KΘ(N-MeIm) >KΘ(2-Et-4-MeIm) >KΘ(2-MeIm). The thermodynamic parameters △rHΘm and △rSΘm were also determined. Results showed that the axial coordination process was driven by enthalpy and entropy.

Key words: Metal template method, Novel Salen-type complexes, Synthesis and characterization, Thermodynamics of axial coordination, Circular dichroismspectrum

MSC2000: 

  • O644