Table 1. Electrochemical data of selected complexes.

	E pa a (V)	E red 1/2 a (V)	HOMO b (eV)	LUMO b (eV)
Pd-N-1	0.53	–2.47	–5.33	–2.33
Pd-B-1	0.81	–2.54	–5.61	–2.26
Pd-B-2	0.73	–2.44	–5.53	–2.36
Pd-B-4	0.81	–2.16	–5.61	–2.64
Pd-G-1	0.53	–2.24	–5.33	–2.56
Pd-G-2	0.59	–2.21	–5.39	–2.59

^aDetermined in DMF at 298 K with 0.1 mol dm^{–3 n}Bu₄NPF₆ as the supporting electrolyte. Scan rate: 100 mV s^–1. Values are versus Cp₂Fe^+/0. Cp₂Fe^+/0 occurs at 0.06–0.08 V versus Ag/AgNO₃ (0.1 mol dm^–3 in CH₃CN) reference electrode.

^bEstimated from E_pa/E_1/2 using a Cp₂Fe^+/0 value of 4.8 eV below the vacuum level.