摘要
用１３Ｃ－１Ｈ异核相关法测定并归属了２，６－二（苯并咪唑－２）吡啶及其钌配合物［Ｒｕ（Ｈ２Ｂｚｉｍｐｙ）２］２＋的１３Ｃ－ＮＭＲ。由配合物与自由配体的对应碳核的化学位移差值（ＣＩＳ）可以分析出配合物中电荷分布的变化情况，进而得到金属离子与配体之间的相互作用微观信息。研究发现［Ｒｕ（Ｈ２Ｂｚｉｍｐｙ）２］２＋的胺基氢的部分解离对配合物的电荷分布和光谱电化学等宏观性能具有调变作用。
13 C-NMR spectra of 2,6-bis(benzoimidazol-2′-yl)pyridine(H 2Bzimpy)and its ruthenium(Ⅱ)complex were assigned by using 13 C- 1H-HECOR methods.For the free ligand,only seven peaks corresponding to carbons were observed because of the homogenization of some carbons.While the spectrum of coordinated ligand showed ten individual signals,which implying magnetic anisotropy of the metal-ligand bond in the complex.The CIS(Coordination Induced Shifts,δ complexed -δ free ) values indicate that ligand-to-metal-donation are the predominant effect for carbons C(2 2′),C(3 3′),C(4 4′),C(7 7′),C(8 8′)and C(10 10′),while for C(1),C(5 5′),C(6 6′)and C(9 9′),the metal-to-ligand π-back-donation should be more important.
关键词
H2Bzimpy
苯并咪唑
吡啶
钌
配合物
NMR spectrum\ Chemical shift\ 2,6-bis(benzoimidazol-2′-yl)pyridine\ Ruthenium(Ⅱ) complex
