. 2016 Feb 24;7(6):3843–3850. doi: 10.1039/c6sc00015k

Table 1. Calculated H₂PO₄^– binding affinities, K_a (M^–1) of dipyrromethane derivatives before (3a and 5a) and after formylation (3b and 5b).

3a ^a ^, ^c	3b ^b ^, ^c	5a ^a	5b ^b ^, ^c
(1.0 ± 0.1) × 10³	(8 ± 2) × 10⁶	40.8 ± 0.6	(4.6 ± 0.9) × 10⁵

^aDetermined using ¹H NMR spectroscopy in CDCl₃.

^bDetermined using UV-Vis spectroscopy in CHCl₃.

^cValues from ref. 24.

Table 1. Calculated H2PO4– binding affinities, Ka (M–1) of dipyrromethane derivatives before (3a and 5a) and after formylation (3b and 5b).