Thermodynamics of Complexation of Alkali Metal Cations by a Lower-Rim Calix[4]arene Amino Acid Derivative

Požar, Josip; Preočanin, Tajana; Frkanec, Leo; Tomišić, Vladislav

doi:10.1007/s10953-010-9550-9

Cited by 16 publications

(33 citation statements)

References 27 publications

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“…[21][22][23][24] The stability constants of the corresponding 1:1 complexes in acetonitrile were determined by spectrophotometric, conductometric and potentiometric titrations. Strong complexation was observed for lithium and sodium (lg K Li1 > 6, lg K Li2 > 6, lg K Na1 = 8.25, lg K Na2 = 7.66), moderate for potassium (lg K K1 = 5.09, lg K K2 = 4.62), whereas larger rubidium and cesium cations did not fit into the peptidocalixarenes ion binding sites.…”

Section: Ms/ms Spectra Of Complexes Of 1 and 2 With Alkalimetal Cationsmentioning

confidence: 99%

“…These results are in accordance with those obtained by "classical" methods. [21][22][23][24] The 1+K + ion was cleaved at potential of 60 eV, but still the signal of this ion remained the most intensive one. It should be noted that no dissocia tion of the complex was observed.…”

Section: Ms/ms Spectra Of Complexes Of 1 and 2 With Alkalimetal Cationsmentioning

confidence: 99%

“…[21][22][23][24] In this paper we present mass spectrometric investigations of the following calix4arene derivatives: 5,11,17,23-tetra-tert-butyl-25,26,27,28-tetrakis(O-methyl-L-tryptophanylcarbonylmethoxy)calix [4]arene (1) …”

Section: Introductionmentioning

confidence: 99%

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ESI MS/MS Study of Calix[4]arene Derivatives and their Metal Complexes

Benković¹,

Tomišić²,

Frkanec³

et al. 2012

Croat. Chem. Acta

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, Yb 3+ ) were analyzed by ESI MS. The influences of the solvent (acetonitrile, methanol, addition of formic acid or sodium acetate) and the calixarene:cation molar ratio on signal intensities were investigated. Comprehensive MS/MS analyses were performed of all singly and doubly charged ions of 1-3 and their complexes, and fragmentation pathways were proposed. An inductive cleavage was observed during dissociation of protonated ions, while the presence of alkali-metal or lanthanide cations caused homolytic cleavage and formation of radical cations. The results of MS analysis were in accordance with those obtained by other techniques (spectrophotometric, potentiometric, and conductometric titrations). The MS/MS experiments could be used as fast and sensitive method for prediction of relative stabilities of calixarene complexes with metal ions. (doi: 10.5562/cca2125)

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Section: Ms/ms Spectra Of Complexes Of 1 and 2 With Alkalimetal Cationsmentioning

confidence: 99%

Section: Ms/ms Spectra Of Complexes Of 1 and 2 With Alkalimetal Cationsmentioning

confidence: 99%

See 1 more Smart Citation

ESI MS/MS Study of Calix[4]arene Derivatives and their Metal Complexes

Benković¹,

Tomišić²,

Frkanec³

et al. 2012

Croat. Chem. Acta

Self Cite

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show abstract

“…Apart from the cation size, the binding process is often strongly influenced by the solvation of the reactants and the complex formed [8][9][10] . In acetonitrile, the inclusion of a solvent molecule into the calixarene hydrophobic cavity [10][11][12][13][14][15][16][17] was shown to be synergetic with the cation complexation. In the derivatives having substituents with secondary amide groups the presence of intramolecular NH···O=C hydrogen bonds considerably reduces the ionophoric activity of macrocycles compared to tertiary amide derivatives.…”

Section: Introductionmentioning

confidence: 99%

“…In the derivatives having substituents with secondary amide groups the presence of intramolecular NH···O=C hydrogen bonds considerably reduces the ionophoric activity of macrocycles compared to tertiary amide derivatives. 10,[18][19][20][21] Interestingly, unlike the binding of alkali-metal cations by calixarenes, the complexation of simple molecular cations, i.e. H 3 O + and NH 4 + , which are similar in size to K + and Rb + , has been rarely explored.…”

Section: Introductionmentioning

confidence: 99%