Association constants (K/M⁻¹) for the formation of 1 : 1 complexes in toluene at 298 K (with percentage errors in brackets).

Ligand	Porphyrin
	P1a	P2a	P3a	P4a	P1b	P2b	P3b	P4b
L9b	6.8 × 103 (30%)	1.1 × 104 (6%)	1.5 × 104 (3%)	1.2 × 104 (10%)	7.3 × 103 (5%)	5.5 × 103 (7%)	1.1 × 104 (5%)	8.9 × 103 (8%)
L10b	7.1 × 103 (10%)	1.3 × 104 (5%)	1.9 × 104 (5%)	1.1 × 104 (6%)	1.3 × 104 (20%)	6.1 × 103 (6%)	1.3 × 104 (5%)	1.1 × 104 (3%)
L9f	1.5 × 104 (5%)	1.1 × 104 (5%)	2.5 × 104 (5%)	6.1 × 103 (3%)	5.3 × 103 (6%)	3.8 × 103 (5%)	7.5 × 103 (5%)	5.8 × 103 (3%)
L10f	7.7 × 104 (10%)	2.4 × 104 (5%)	9.9 × 104 (8%)	7.8 × 103 (3%)	7.4 × 103 (40%)	4.1 × 103 (4%)	9.9 × 103 (3%)	8.2 × 103 (5%)
L9e	1.8 × 105 (6%)	1.4 × 105 (5%)	4.8 × 105 (7%)	1.1 × 104 (7%)	5.5 × 103 (30%)	3.8 × 103 (3%)	7.4 × 103 (3%)	6.0 × 103 (5%)
L10e	1.7 × 107 (20%)a	1.9 × 106 (10%)a	2.5 × 107 (10%)a	4.1 × 104 (20%)	9.4 × 103 (40%)	5.1 × 103 (4%)	1.2 × 104 (5%)	1.0 × 104 (4%)

^aMeasured by manual fluorescence titration.