Abstract: The structures and equilibria of the co and(180-C-6) coordination com poundsin the acetone solution were studied by NMR method. By the analysis of shift values, It is shown that there are two main equilibria the solution. The equilibrium constants K₁₁=2.95×10² l/mol, K₂₁=6.1 l/mol as Well as the limited Chemical Shifts D₁₁^(H)=350Hz, D₁₁^(c)=-290Hz, D₂₁^(H)=1300Hz, D₂₁^(c)=-1600Hz are determined. A set of computer Programs are established. We prove that the shift mechanism is from a throgh-space dipolar interaction between the electronic magnetic moment and the magnentic moment of the resonating nucleus.