caa a22 4500 469059206 CHVBK 20180323132852.0 cr unu---uuuuu 170328e19920101xx s 000 0 eng 10.1007/BF01053874 doi (NATIONALLICENCE)springer-10.1007/BF01053874 Complexes between disubstituted benzo-15-crown-5 ligands and sodium or potassium bromides [Elektronische Daten] [Martin Payne, Mary Truter] Stability constants have been determined with ion selective electrodes for complexes between sodium or potassium bromide in methanol with each of four crown ethers, benzo-15-crown-5 (Ia), dibromobenzo-15-crown-5 (Ib), dimethoxybenzo-15-crown-5 (Ic) and di-n-butoxybenzo-15-crown-5 (Id). Those for (Ib) were significantly lower than the others. The stability constants for complexes between sodium bromide and (Ia) and (Ib) in dimethylformamide (DMF) were found to be about one fifth of the corresponding values in methanol. The conductivity method was used to measure the ion pairing in methanol of sodium bromide alone and in the presence of (Ia), (Ib), or (Ic). Ion pairing is increased on complexation, the association constants being 3.3 mol−1 dm3 for Na+ Br− and 20-23 mol−1 dm3 for Na(Ia-c)+ Br−. The syntheses of compounds (Ic) and (Id) are described. Kluwer Academic Publishers, 1992 Crown ethers nationallicence stability constants nationallicence ion pairing nationallicence Payne Martin Molecular Structures Department, Rothamstead Experimental Station, Harpenden, ALS 2JQ, Herts. aut Truter Mary Chemistry Department, University College, 20 Gordon Street, WC1H OAJ, London, UK aut Journal of inclusion phenomena and molecular recognition in chemistry Kluwer Academic Publishers 12/1-4(1992-01-01), 361-375 0923-0750 12:1-4<361 1992 12 10847 https://doi.org/10.1007/BF01053874 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01053874 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Payne Martin Molecular Structures Department, Rothamstead Experimental Station, Harpenden, ALS 2JQ, Herts aut NATIONALLICENCE 700 1- Truter Mary Chemistry Department, University College, 20 Gordon Street, WC1H OAJ, London, UK aut NATIONALLICENCE 773 0- Journal of inclusion phenomena and molecular recognition in chemistry Kluwer Academic Publishers 12/1-4(1992-01-01), 361-375 0923-0750 12:1-4<361 1992 12 10847 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer