TABLE 4.

Experimental spin Hamiltonian parameters for Cu(II) complexes formed by L⁶ and L⁴ .

Ligand	Species	g z	|A z| (63Cu) a	Equatorial donor set
L 6 (R = OH)	[Cu(LH)]+ (I)	2.325	152.3	[(O−, N); H2O; H2O]
	[Cu(L)] (IIa)	2.273	169.5	[(O−, N, N2 im); H2O]
	[Cu(LH–1)]– (IIIa)	2.223	182.0	[(O−, N, N2 im); OH−]
L 4 (R = CH3)	[Cu(LH)]+ (I)	2.326	150.7	[(O−, N); H2O; H2O]
	[Cu(L)] (IIa)	2.273	170.0	[(O−, N, N2 im); H2O]
	[Cu(L)] (IIb)	2.217	183.6	[(O−, N, N1 im); H2O] or [(O−, N, N1 im, CO−)]
	[Cu(LH–1)]– (IIIa)	2.224	183.8	[(O−, N, N2 im); OH−]
	[Cu(LH–1)]– (IIIb)	2.296	∼174	[(O−, N, N1 im); OH−]

^a Hyperfine coupling constant reported in 10⁻⁴ cm^–1 units.