Electrochemical data^a for the three free base triazole meso-arylporphyrins 4a–c and the corresponding zinc(ii) complexes 5a–c and a selection of several related porphyrins species.

Compound	Oxidations		Reductions		Ref.
	First oxid.	Second oxid.	First red	Second red.
	(O1, R1)	(O2, R2)	(R3, O3)	(R4, O4)
	E 1/2 b	E 1/2	E 1/2	E 1/2
H2(TAzP-HVP) 4a	0.86	1.09	−0.95	−1.36	This work
H2(TAzP-ClVP) 4b	0.85	1.08	−0.76	−1.40	This work
H2(TAzP-IVP) 4c	0.78	1.13	−0.82	−1.37	This work
H2(TPP)c	1.02	1.26	−1.20	−1.55	40
H2(TBPP)d	0.95	1.36	−1.12	−1.53	24
[Zn(TAzP-HVP)] 5a	0.72	1.08	−1.36	—	This work
[Zn(TAzP-ClVP)] 5b	0.71	1.09	−1.37	—	This work
[Zn(TAzP-IVP)] 5c	0.72	1.05	−1.37	—	This work
[Zn(TPP)]c	0.89	1.18	−1.26	−1.70	41
[Zn(TBPP)]d	0.81	1.11	−1.48	−1.76	24
[Zn(DTPP)]e	0.72	1.15	−1.42	—	40

^aThe potentials are reported versus SCE.

^b E _1/2 = half wave potential.

^cTPP = meso-tetraphenylporphyrinato.

^dH₂TBPP = meso-{tetrakis-[4-(benzoyloxy)phenyl]porphyrin.

^eDTPP = 5,15-p-ditolyl-10-phenylporphyrinato.