In:
Pure and Applied Chemistry, Walter de Gruyter GmbH, Vol. 75, No. 1 ( 2003-01-01), p. 71-102
Abstract:
Stability constants and thermodynamic functions of metal complexes of crown ethers in various solvents published between 1971 and the beginning of 2000 have been critically evaluated. The most studied crown ethers have been selected: 1,4,7,10 tetraoxacyclododecane (12C4), 1,4,7,10,13 pentaoxacyclopentadecane (15C5), and 1,4,7,10,13,16 hexaoxacyclooctadecane (18C6). The metal ions chosen are: alkali and alkaline earth metal ions, Ag + , Tl + , Cd 2+ , and Pb 2+ . The solvents considered are: water, methanol, ethanol, and their mixtures, as well as acetonitrile, N , N' -dimethylformamide, dimethylsulfoxide, and propylene carbonate. The published data have been examined and grouped into two categories, “accepted” and “rejected”. The “accepted” values were considered as: (i) recommended ( R ), when the standard deviations (s.d.) on the constant K or on Δ r H were inferior to 0.05 lg unit or inferior to 1 kJ mol −1 , respectively; (ii) provisional ( P ), when s.d. is superior to 0.05 and inferior to 0.2 for lg K or s.d. is superior to 1 and inferior to 2 kJ mol −1 for Δ r H ; (iii) recommended 1 ( R1 ), if the values were obtained by a single research group, but were considered reliable in comparison with related systems, and considering that the research team usually presents R-level values for other similar systems.
Type of Medium:
Online Resource
ISSN:
1365-3075
,
0033-4545
DOI:
10.1351/pac200375010071
Language:
English
Publisher:
Walter de Gruyter GmbH
Publication Date:
2003
detail.hit.zdb_id:
2022101-0
