Stability constants of cesium complexes with 18-crown-6 in ionic liquids

Vendilo, A. G.; Rönkkömäki, Hannu; Hannu-Kuure, M.; Lajunen, Marja; Asikkala, Y.; Petrov, A. A.; Krasovsky, V. G.; Chernikova, Е. А.; Oksman, Pentti; Lajunen, Lauri H. J.; Popov, Konstantin

doi:10.1134/s1070328408090017

Cited by 5 publications

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“…130 The stability constants of cesium complexes with the 18crown-6 ether were measured using 133 Cs NMR in the [BPy][CH 3 SO 4 ], [BMPy][BF 4 ], and [BMIM][Tf 2 N] systems. 131 Interestingly, it was found that a 1:1 complex of Cs + /18-crown-6 was formed in [BPy][CH 3 SO 4 ], whereas both 1:1 and 1:2 species were formed in [BMPy][BF 4 ]. Variable-temperature NMR (30-50 °C) was used to estimate the thermodynamic parameters of the second 18-crown-6 molecule complexation to the 1:1 complex in [BMPy][BF 4 ]: ∆H ) 47 kJ mol -1 and ∆S ) 131 J mol -1 K -1 .…”

Section: Extraction and Separationmentioning

confidence: 99%

“…Thus, it can be concluded that the enthalpy change is favorable for the formation of the 1:2 complex, whereas the entropy change hinders the complexation. 131 The study was further extended to investigate the influence of the nature of cation and anion of ILs on the stability of cesium complexes with 18-crown-6. 132 Lithium complexes with several different crown ethers were studied by 7 Li NMR in [EMIM][AlCl 4 ].…”

Section: Extraction and Separationmentioning

confidence: 99%

“…The stability constants of cesium complexes with the 18-crown-6 ether were measured using 133 Cs NMR in the [BPy][CH 3 SO 4 ], [BMPy][BF 4 ], and [BMIM][Tf 2 N] systems . Interestingly, it was found that a 1:1 complex of Cs + /18-crown-6 was formed in [BPy][CH 3 SO 4 ], whereas both 1:1 and 1:2 species were formed in [BMPy][BF 4 ].…”

Section: Chemical Applications Of Nmr Spectroscopy In Native Ils Systemsmentioning

confidence: 99%

“…Variable-temperature NMR (30−50 °C) was used to estimate the thermodynamic parameters of the second 18-crown-6 molecule complexation to the 1:1 complex in [BMPy][BF 4 ]: Δ H = 47 kJ mol −1 and Δ S = 131 J mol −1 K −1 . Thus, it can be concluded that the enthalpy change is favorable for the formation of the 1:2 complex, whereas the entropy change hinders the complexation . The study was further extended to investigate the influence of the nature of cation and anion of ILs on the stability of cesium complexes with 18-crown-6 …”

Section: Chemical Applications Of Nmr Spectroscopy In Native Ils Systemsmentioning

confidence: 99%

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