Experimental Evidence for a Valinomycin – Proton Complex

Makrlík, Emanuel; Vaňura, Petr

doi:10.1007/s00706-005-0422-8

Cited by 115 publications

(22 citation statements)

References 15 publications

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“…Furthermore (referring to [31,[54][55][56]), for the exchange extraction constants K ex (HL ? , Cs ? )…”

Section: Extraction Experimentsmentioning

confidence: 99%

“…= 0.4. Previous results [31,[54][55][56] indicated that the two-phase water-HL ? Cl -/nitrobenzene-CsDCC-1 (HAB-based receptor) extraction system (see ''Experimental''), which was chosen to determine the stability constant of the cationic complex 1ÁHL ?…”

Section: Extraction Experimentsmentioning

confidence: 99%

“…Recently, the protonation of valinomycin, some calixarenes, dibenzo-18-crown-6, and the above-mentioned HAB-based receptor 1 has been investigated in detail [31][32][33][34][35][36][37][38][39][40][41][42][43]. Further, the theoretical structures of the complexes of valinomycin with Li ?…”

Section: Introductionmentioning

confidence: 98%

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Cooperative interaction of protonated 1,4-diazabicyclo[2.2.2]octane with a hexaarylbenzene-based receptor: an experimental and theoretical study

et al. 2012

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“…Furthermore (referring to [31,[54][55][56]), for the exchange extraction constants K ex (HL ? , Cs ? )…”

Section: Extraction Experimentsmentioning

confidence: 99%

Section: Extraction Experimentsmentioning

confidence: 99%

See 1 more Smart Citation

Cooperative interaction of protonated 1,4-diazabicyclo[2.2.2]octane with a hexaarylbenzene-based receptor: an experimental and theoretical study

et al. 2012

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“…Our previous papers [22,23] indicated that the twophase water-Ba(NO 3 ) 2 -nitrobenzene-1 (cyclosporin A)-Sr(DCC) 2 (strontium dicarbollylcobaltate) synergistic extraction system (see ''Experimental''), chosen for determination of the stability constant of the cationic complex 1ÁBa 2? in nitrobenzene saturated with water, can be characterized by the main chemical equilibrium (Eq.…”

Section: Extraction Experimentsmentioning

confidence: 99%

“…This constant experimentally proves the justifying of the extraction mechanism and the presentation of the corresponding species, expressed by the two-phase chemical equilibrium (3). Furthermore, with respect to our previous papers [22,23], for the extraction constant K ex (Ba 2? , Sr 2? )…”

Section: Extraction Experimentsmentioning

confidence: 99%

Complexation of the barium cation with cyclosporin A: an experimental and theoretical study

2016

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On the basis of extraction experiments in the two-phase water-nitrobenzene system and c-activity measurements, we determined the stability constant of the cyclosporin A-Ba 2? cationic complex dissolved in nitrobenzene saturated with water as 10 9.1 ± 0.2 . Using quantum mechanical calculations, the most probable structure of this complex species was derived. In the resulting complex, the ''central'' cation Ba 2? is bound by six bonds to the respective six carbonyl oxygen atoms of the parent cyclosporin A ligand. The interaction energy of this proven cationic complex was found to be -769.5 kJ mol -1 , confirming also the formation of the mentioned complex species. Graphical abstract

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Theoretical and experimental study of the complexation of valinomycin with ammonium cation

et al. 2008

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The interactions of valinomycin, macrocyclic depsipeptide antibiotic ionophore, with ammonium cation NH4+ have been investigated. Using quantum mechanical density functional theory (DFT) calculations, the most probable structure of the valinomycin-NH4+ complex species was predicted. In this complex, the ammonium cation is bound partly by three strong hydrogen bonds to three ester carbonyl oxygen atoms of valinomycin and partly by somewhat weaker hydrogen bonds to the remaining three ester carbonyl groups of the valinomycin ligand. The strength of the valinomycin-NH4+ complex was evaluated experimentally by capillary affinity electrophoresis. From the dependence of valinomycin effective electrophoretic mobility on the ammonium ion concentration in the background electrolyte, the apparent binding (association, stability) constant (Kb) of the valinomycin-NH4+ complex in methanol was evaluated as log Kb = 1.52 +/- 0.22.

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Experimental Evidence for a Valinomycin – Proton Complex

Cited by 115 publications

References 15 publications

Cooperative interaction of protonated 1,4-diazabicyclo[2.2.2]octane with a hexaarylbenzene-based receptor: an experimental and theoretical study

Cooperative interaction of protonated 1,4-diazabicyclo[2.2.2]octane with a hexaarylbenzene-based receptor: an experimental and theoretical study

Complexation of the barium cation with cyclosporin A: an experimental and theoretical study

Theoretical and experimental study of the complexation of valinomycin with ammonium cation

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