By Arthur E. Martell, Robert M. Smith

Over the prior twenty 5 years the fee on Equilibrium facts of the Analytical department of the foreign Union of natural and utilized Chemistry has been sponsoring a noncritical compilation of steel complicated formation constants and comparable equilibrium constants. This paintings was once wide in scope and ended in book of 2 huge volumes of balance Constants by way of the Chemical Society (London). the 1st quantity, edited through L. G. Sillen (for inorganic ligands) and through A. E. Martell (for natural ligands), was once released in 1964 and lined the literature via 1962. the second one quantity, subtitled complement No. 1, edited via L. G. Sillen and E. Hogfeldt (for inorganic ligands), and A. E. Martell and R. M. Smith (for natural ligands), was once released in 1971 and coated the literature as much as 1969. those huge compilations tried to hide all papers within the box regarding steel complicated equilibria (heats, entropies, and loose energies). so much lately a noncritical compilation of natural ligands through D. D. Perrin (Pergamon Press) prolonged insurance of the literature via 1973 and an analogous quantity for inorganic ligands through E. Hogfeldt coated via 1974. because it was once the coverage of the fee in the course of that interval to prevent judgements about the caliber and reliability of the printed paintings, th~ compilation may often include from ten to 20 values for a unmarried equilibrium constant.

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43 (1. 9) (1. H (1. 9)n-o. 2 (1. H Log K 2s•. 1 Log K 2s•. 8 Log K 2s·. 93 ML 2 /MOH! 0 10. HL 5. 51 MHL 2/ML 2 . H 6. 99n 7. 63 ML 2 /MOHL 2 . H 10. 46 11. lS; Yo- and DL-isomers have about the same value. H DL-2-Mercaptohistidine HzL Log K zs·. H zs·. l; woptical isomerism not given. 6S zs·. 1 (10) (6) A. 426) ~H Log K Log K Log K 25". 1 25". o 25•. 5 25•. 2 M(HL) 2;M. H (1. L Bibliography: H+ 81PSK,84TS; Ag+ 81PSK,84TS; Other reference: 81PS Metal ion ~ HL ~s 25°. 1 6 NH 2 I CH 3CH 2SCH 2CHC02H c5H11o2Ns Metal ion ~ L-2-Amino-3-(ethylthio)propanoic acid (S-ethylcysteine) Log K 25•.

1 25". o 25•. 5 25•. 2 M(HL) 2;M. H (1. L Bibliography: H+ 81PSK,84TS; Ag+ 81PSK,84TS; Other reference: 81PS Metal ion ~ HL ~s 25°. 1 6 NH 2 I CH 3CH 2SCH 2CHC02H c5H11o2Ns Metal ion ~ L-2-Amino-3-(ethylthio)propanoic acid (S-ethylcysteine) Log K 25•. L 8. HL M(HL) 2;M. H M(H 2 L~HL/M(HL) (1. H b25 °'0. 5 Bibliography: H+ 81CPS,81SBa,81TMM,84TS; Log K 25•. 03 (1. 9) ±0. 43 Log K 25•. 10 HL II. H Log K 25•. o5 Log K 25•. S 25·. 88t·x (7. 7\ (1. H CH 3Hg+ Log K 25•. 48 M(HL) 2/M. L ML/M. 94 7. 09; XDL-mixture; YL- and DL-isomers have about the same value.

Oh 45. L 2 MHL/MLZH 3 M2L3/M3. 2 (45) A. L Log K 25°. 2lb Log K 25 °. 1. 0 Log K 25°. 0 Mt 25°. S 25°. HL 2/MHL. 22) Log K Log K Log K 0 25°. 0 25°. 1 °. H 7. 43 (1. 9) (1. H (1. 9)n-o. 2 (1. H Log K 2s•. 1 Log K 2s•. 8 Log K 2s·. 93 ML 2 /MOH! 0 10. HL 5. 51 MHL 2/ML 2 . H 6. 99n 7. 63 ML 2 /MOHL 2 . H 10. 46 11. lS; Yo- and DL-isomers have about the same value. H DL-2-Mercaptohistidine HzL Log K zs·. H zs·. l; woptical isomerism not given. 6S zs·. 1 (10) (6) A. 426) ~H Log K Log K Log K 25". 1 25".

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