Synthesis of Benzothiazole Derivatives and Their Metal Complexes for Structural, Optical, and Magnetic Properties Studies
Date Issued
2006
Date
2006
Author(s)
Chang, Chin-Yan
DOI
zh-TW
Abstract
Some molecular species containing an octahedrally coordinated transition metal ion with the 3dn (4 ≤n ≤ 7) electronic configuration may show a crossover between a low-spin (LS) and a high-spin (HS) state. This crossover may be induced by variation of temperature or pressure, or by irradiation. In this study, we synthesized a series of benzothiazole heterocyclic bidentate and tridentate ligands. Through complexation with 3dn ( 4 ≤n ≤ 7 ) transition metal, we found that there is an effective “thermal induced spin-crossover” property in iron(II) complexes. Moreover, we incorporated different functional groups on ortho and meta positions of benzothiazole in order to understand the electronic effect on the metal complexation. Results indicate that there is clear thermal induced color change in solution of bidentate ligand series 1 complexed with Iron(II). From magnetic study, the iron(II) complexes based on series 1 exibit gradual spin transition in solid state.
Adding the Fe(II) ions to solutions of tridentate ligands 2, 3, and 4 , color changes from colorless to light-yellow. From absorption spectra, introducing electron-donating or electron-withdrawing groups to the ortho or meta positions of benzothiazole influence the electeon density of nitron atom, which can fine tune the binding ability to metal ions.
Subjects
苯並噻
唑
自旋交叉
benzothiazole
spin crossover
Type
thesis
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