Complex

EPR

Electronic spectra

A_||

g_||

g_^

l max., nm (e, M⁻¹・cm⁻¹)

[(Pip)₄Cu₄Cl₄(CO₃)₂]

166.00

2.379

2.065

2.172

740 (680), 840 (675)

[(Pip)₈Cu₄Cl₄(CO₃)₂]

102.13

2.390

2.075

2.180

740 (590), 840 (560)

[(Pip)₄Cu₄Br₄(CO₃)₂]

162.16

2.440

2.077

2.198

740 (1130), 840 (1080)

[(Pip)₈Cu₄Br₄(CO₃)₂]

53.00

2.387

2.090

2.187

740 (1000), 840 (950)