A novel Schiff base derived from salicylidene and tyrosine and its copper(I
I) complex have been synthesized and characterized. The composition of the
complex is K[CuL(Ac)].H2O, where L = H13C16NO4. Electron spin resonance (ES
R) spectra of the copper(II) complex were investigated at different tempera
tures and in various solvents. The second-order effect and the relaxation e
ffect were observed in the solution spectrum at room temperature and satisf
actorily explained by the spin Hamiltonian. The bonding parameters of the C
u(II) complex were calculated with spectral parameters from ESR spectra at
low temperature. Its bonding characterization and stability were discussed.
The result shows that both the in-plane sigma -bond and the in-plane pi -b
ond in the complex play an important role.