Table 1. Logarithms of the protonation and formation constants of Ins(1,3,4,5,6)P 5 measured in 0.15 M NMe4Cl at 37.0 °C.
log K
|
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31P NMR a | Potentiometry b | |
L10– + H+ ↔ HL9– | 12.41(4) | 11.62(5) |
L10– + 2H+ ↔ H2L8– | 23.58(4) | 23.02(3) |
L10– + 3H+ ↔ H3L7– | 32.53(4) | 32.39(7) |
L10– + 4H+ ↔ H4L6– | 39.62(4) | 39.81(7) |
L10– + 5H+ ↔ H5L5– | 44.63(5) | 45.2(1) |
L10– + 6H+ ↔ H6L4– | 47.6(1) | 47.8(1) |
L10– + 7H+ ↔ H7L3– | 49.0(1) | 48.9(2) |
4Na+ + L10– ↔ [Na4L]6– | 6.58(3) | 7.91(4) |
3Na+ + HL9– ↔ [Na3(HL)]6– | 4.73(2) | 5.33(4) |
2Na+ + H2L8– ↔ [Na2(H2L)]6– | 2.41(1) | 2.67(5) |
Mg2+ + HL9– ↔ [Mg(HL)]7– | 5.3(1) | — |
Mg2+ + H2L8– ↔ [Mg(H2L)]6– | 4.18(4) | 4.43(4) |
Mg2+ + H3L7– ↔ [Mg(H3L)]5– | 3.1(2) | 3.32(5) |
Mg2+ + H4L6– ↔ [Mg(H4L)]4– | 2.06(7) | 2.33(9) |