Separation of optical isomers of fac-triscobalt(III) chelates of several L-α-amino acids and dissolution behavior of their isomers in water

Yoshimura, Yukio

doi:10.1016/s0020-1693(00)91456-7

Cited by 5 publications

(3 citation statements)

References 29 publications

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“…7,11 The spectroscopic properties (λ max /nm, ε max /(10 dm 2 mol −1 ) ) and analytical data of these chelates are as follows: , m 0 ) was measured in the same manner as in previous studies. [6][7][8][9][10][11] The measurement was repeated at least four times at each temperature, and the errors defined as the deviations at the 95% confidence levels, were less than 2% of the mean values of these individual experimental values in most cases.…”

Section: Methodsmentioning

confidence: 99%

“…The thus-obtained values for ∆ dis G°, ∆ dis H° , and T∆ dis S° at 25 °C are tabulated in Table 3, where the corresponding values estimated from the solubility data for the fac-(+)-and mer-(+)-isomers reported previously 6,7,10,11 are also listed. The errors of ∆ dis H°, estimated from the standard deviations of the least-squares analysis, were less than 0.5 kJ mol 3 ] became large (5.0 kJ mol…”

Section: And Mer-(+)-[co(l-thr)mentioning

confidence: 99%

“…In a series of investigations, I have reported on the dissolution behavior of fac-(+)- [Co(L-aa) 3 ] in water, 6,7 3 ], [8][9][10] and the hydrophobic interaction of 3 ] with tetrabutylammonium ion. 11 These investigations suggest that various [Co(aa) 3 ] may provide useful information about the interactions of the side chains of amino acids with their surroundings.…”

mentioning

confidence: 99%

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Solubility Differences among Geometric and Optical Isomers of Tris(amino acidato)cobalt(III)

Yoshimura¹

2002

Bulletin of the Chemical Society of Japan

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The solubilities of soluble mer-(-)-isomers of various tris(amino acidato)cobalt(III) ([Co(aa)3]) in water were determined over the temperature range 5 to 50 °C. From these data the standard free energy (ΔdisG°), enthalpy (ΔdisH°), and entropy of dissolution (ΔdisS°) at 25 °C were estimated and compared with the values reported for mer-(+)-, fac-(-)-, and fac-(+)-isomers of [Co(aa)3]. The solubilities of these isomers increase in the order fac-(+)- < fac-(-)- < mer-(+)- < mer-(-)-isomers for [Co(aa)3] synthesized from amino acids with longer side chains than 2-aminobutyric acid. On the other hand, the increasing sequence of the solubilities for tris(L-alaninato)cobalt(III) ([Co(L-ala)3]) and tris(L-serinato)cobalt(III) ([Co(L-ser)3]) is fac-(+)- < mer-(+)- < fac-(-)- < mer-(-)-isomers. The solubility differences between the mer- and fac-isomers and between the (-)- and (+)-isomers are discussed based on the differences of ΔdisH° and TΔdisS° among these isomers. Furthermore, the influence of introducing hydroxyl and methyl groups into the side chains of the amino acids on the dissolution behavior of [Co(aa)3] is discussed.

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Section: Methodsmentioning

confidence: 99%

Section: And Mer-(+)-[co(l-thr)mentioning

confidence: 99%

mentioning

confidence: 99%

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Solubility Differences among Geometric and Optical Isomers of Tris(amino acidato)cobalt(III)

Yoshimura¹

2002

Bulletin of the Chemical Society of Japan

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Solubilization of fac-tris (amino acidato) cobalt (III) by sulfuric acid and sodium sulfate

Yoshimura

1996

Inorganica Chimica Acta

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Specific Salt Effect on the Solubility of fac-Tris(α-amino acidato)cobalt(III)

Yoshimura¹

1996

Bulletin of the Chemical Society of Japan

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The salt effect on fac-tris(aniono)cobalt(III) of α-amino acids (fac-[Co(amino acidato)3]), such as d-proline and glycine, was examined by determining its solubility in various aqueous salt solutions. For a comparison, the solubilities of tris(2,4-pentanedionato)cobalt(III) ([Co(acac)3]) and l-phenylalanine (l-phalaH) were also determined. The enthalpy (ΔHs) and entropy of dissolution (ΔSs) were estimated from the temperature dependence of the solubility. While NaCl and Na2SO4 cause a decrease in the solubilities (salting-out effect) of [Co(acac)3] and l-phalaH, these salts result in an increase in the solubility (salting-in effect) of fac-[Co(amino acidato)3]. The salting-out of [Co(acac)3] is caused by an increase in ΔHs, while the salting-out of l-phalaH results from a decrease in TΔSs. On the other hand, the salting-in of fac-[Co(amino acidato)3] is caused by a decrease in ΔHs. These results suggest that the origin of the salt effect on fac-[Co(amino acidato)3] and l-phalaH differs from that of the salt effect on [Co(acac)3].

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Separation of optical isomers of fac-triscobalt(III) chelates of several L-α-amino acids and dissolution behavior of their isomers in water

Cited by 5 publications

References 29 publications

Solubility Differences among Geometric and Optical Isomers of Tris(amino acidato)cobalt(III)

Solubility Differences among Geometric and Optical Isomers of Tris(amino acidato)cobalt(III)

Solubilization of fac-tris (amino acidato) cobalt (III) by sulfuric acid and sodium sulfate

Specific Salt Effect on the Solubility of fac-Tris(α-amino acidato)cobalt(III)

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