Effective molarities (EM/mM) for intramolecular amide-phenol and ester-phenol H-bonds measured at 298 K in toluene^a.

		Ligand
		L9e	L10e	L9f	L10f
Porphyrin	P1a	100	180	170	310
	P2a	55	40	b	57
	P3a	130	120	110	150
	P4a	b	3	b	b

^aAverage error over the data set is ±50%.

^bNo interaction detected.