A Study on ¹³C-NMR Spectra of 2,6-Bis（benzomidazol-2'-yl）Pyridine and Its Ruthenium（Ⅱ） Complex

¹³C-NMR spectra of 2,6-bis (benzoimidazol-2'-yl)pyridine (H₂Bzimpy) and its ruthenium (Ⅱ) complex were assigned by using ¹³C-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.