Table 1 Binding constants of L for anions (A) in DMSO-d 6 a.

From: Remarkable hexafunctional anion receptor with operational urea-based inner cleft and thiourea-based outer cleft: Novel design with high-efficiency for sulfate binding

Anions

Log K 1 (or Log β 1 )

Log K 2

Log β 2 (β 2  = K 1 K 2 )

SO4 2−

3.07(3)

2.56(4)

5.63(4)

HSO4 −

2.41(5)

1.65(5)

4.06(5)

H2PO4 −

2.06(5)

1.75(3)

3.81(5)

ClO4 −

<1

<1

<1

NO3 −

<1

<1

<1

  1. aThe binding constants were determined using a 1:2 binding model for the following reaction: \({\bf{L}}+{\rm{A}}\mathop{\rightleftharpoons }\limits^{{K}_{1}}[{\bf{L}}{\rm{A}}]\underset{A}{\overset{{K}_{2}}{\rightleftharpoons }}[{\bf{L}}{{\rm{A}}}_{2}]\).
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