4—氟—2,2'—联吡啶钴(Ⅱ)(Ⅲ)镍(Ⅱ)配合物的合成及几何异构

SYNTHESIS AND GEOMETRICAL ISOMERS OF TRIS (4-FLUORO-2,2' BIPYRIDINE) Co(II),(III)AND Ni(II) CHLORIDE

本文报道4-氟-2,2′-联吡啶(fbpy),[Co(fbpy)_3]3ClO_4(Ⅰ),[Co(fbpy)_3](Ⅱ)和[Ni(fbpy)_3]Cl_2(Ⅲ)的合成和后三者的几何异构体.从^(19)F NMR光谱证实;配合物(Ⅰ)在水溶液中是d^6抗磁体系,存在面式(fac)和径式(mer)两种刚性几何异构体,两者比例是1:3;配合物(Ⅱ)和(Ⅲ)分别是d^7和d^8顺磁体系,^(19)F NMR光谱是宽峰但仍可辨认出也都存在1:3的fac和mer.此外用~1H NMR测磁矩的方法验证了三个配合物的磁性。

This paper described the synthesis of 4-fluoro-2,2'-bipyridine(fbpy), (fbpy)3Co(Ⅱ),(Ⅲ) and Ni(Ⅱ) chloride, and their structure studied by means of 19F NMR spectroscopy. The 19F spectrum and magnetic moment of (fbpy)3Co(Ⅲ) chloride confirmed the forming of diamagnetic Co(Ⅲ) d complex and the presence of rigid fac and mer geometrical isomers in aqueous solution. Since fbpy formed paramagnetic d1 and d complexes with Co(Ⅱ) and Ni(Ⅱ) respectively, 19F NMR spectroscopy was not available, however, 19F spectrum of (fbpy)3Co(Ⅱ) chloride still provided enough information to show the presence of rigid fac and mer isomers.