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Citation: Liu Zhi-Xian, Shi Shuang-Qun, Zhang Jian-Jun, Song Xin-Fang, Meng Min-Quan. Coordinating Properties of Nickel(II) tetra(4-N-benzylpyridyl) porphyrin in Aqueous Solution[J]. Acta Physico-Chimica Sinica, ;1997, 13(07): 659-662. doi: 10.3866/PKU.WHXB19970718 shu

Coordinating Properties of Nickel(II) tetra(4-N-benzylpyridyl) porphyrin in Aqueous Solution

1.
Department of Chemistry,Center of Experiment,Department of Science and Research,Hebei Teachers' University,Shijiazhuang 050016

Received Date: 18 November 1996
Available Online: 15 July 1997

Beer's law experiment, variable-temperature spectral experiment of UV-Vis absorption, 1H NMR, and measurement of magnetic moment were conducted for NiTMPyP in aqueous solution. It was found that Beer's law was obeyed in concentration range 8× 10-7-2×10-5.mol•dm-3.With the temperature increasing from 0 ℃ to 95 ℃, the isosbestic point appeared at 435 nm and the lowest downfield 1H NMR peak narrowed gradually and shifted to upfield. The magnetic moment is 2.07 BM in D2O at 30 ℃, but in the D2O-CD3COCD3 mixed solvent there was no evidence for the existance of paramagnetic species. These results show that NiTMPyP exists in aqueous solution as an equilibrium mixture of diamagnetic, four-coordinate nickel (Ⅱ) and paramagnetic, sir-coordinate nickel (Ⅱ) complexed by water molecules in the axial position. The thermodynamic parameters of the axial-coordinated reaction were △S?=-178.6 J•K-1•mol-1, △G298K?=-1.6 kJ•mol-1.
- Nickel(II) porphyrin,
- Coordinate property,
- Absorption spectrum,
- ¹H NMR spectrum,
- Beer's law
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