Table 1 Anion binding and transmembrane anion transport properties of compound 1, along with literature values of anion hydration free energies and anion binding properties of compound 2 and PC vesicles

SO₄^2–

(7.4 ± 1.1)×10⁹

>10⁵

54,000 ± 3000

370 ± 10^c

ND

0.042 ± 0.006

H₂PO₄^–

>10⁵

46,000

140 ± 20

<1

ND

0.031 ± 0.010

Cl^–

2000 ± 100

670

19 ± 1^c

<1

0.2^d

0.082 ± 0.016

Br^–

200 ± 10

70

29 ± 1^c

2.6 ± 0.6^c

2^d

0.097 ± 0.018

NO₃^–

340 ± 10

10

210 ± 10^c

24 ± 4^c

2.8^d

2.1 ± 0.1

I^–

6.1 ± 0.6

3

200 ± 10^c

24 ± 2^c

32^e

2.0 ± 0.4

ClO₄^–

<1

ND

32 ± 1^c

45 ± 9^c

115^e

0.83 ± 0.10