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Citation: GUO Li-Qin, SHI Xiu-Li, RUAN Wen-Juan, ZHANG Xiao-Hong, ZHU Zhi-Ang. Synthesis and Characterization of Novel Salen-Type Complexes and Their Axial Coordination Thermodynamics[J]. Acta Physico-Chimica Sinica, ;2010, 26(05): 1195-1201. doi: 10.3866/PKU.WHXB20100336 shu

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

1.
College of Chemistry, Nankai University, Tianjin 300071, P. R. China

Received Date: 15 October 2009
Available Online: 4 February 2010

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