Critical Evaluation of Stability Constants and Thermodynamic Functions of Metal Complexes of Crown Ethers

2016 ◽  
Author(s):  
Françoise Arnaud-Neu ◽  
Rita Delgado ◽  
Sílvia Chaves
Keyword(s):  
Metal Complexes ◽  
Stability Constants ◽  
Crown Ethers ◽  
Thermodynamic Functions ◽  
Critical Evaluation

Critical evaluation of stability constants and thermodynamic functions of metal complexes of crown ethers (IUPAC Technical Report)

2003 ◽  
Vol 75 (1) ◽  
pp. 71-102 ◽  
Author(s):  
Francoise Arnaud-Neu ◽  
Rita Delgado ◽  
Sílvia Chaves
Keyword(s):  
Metal Ions ◽  
Metal Complexes ◽  
Stability Constants ◽  
Crown Ethers ◽  
Thermodynamic Functions ◽  
Critical Evaluation ◽  
Earth Metal ◽  
Published Data ◽  
Technical Report ◽  
Alkaline Earth Metal Ions

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+, Cd2+, and Pb2+. 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 ΔrH 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 ΔrH; (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.

scholarly journals Critical evaluation of stability constants of metal complexes of complexones for biomedical and environmental applications* (IUPAC Technical Report)

2005 ◽  
Vol 77 (8) ◽  
pp. 1445-1495 ◽  
Author(s):  
Giorgio Anderegg ◽  
Francoise Arnaud-Neu ◽  
Rita Delgado ◽  
Judith Felcman ◽  
Konstantin Popov
Keyword(s):  
Experimental Data ◽  
Stability Constant ◽  
Metal Complexes ◽  
Stability Constants ◽  
Critical Evaluation ◽  
Iminodiacetic Acid ◽  
Quality Data ◽  
Tetraacetic Acid ◽  
Diacetic Acid ◽  
Technical Report

Available experimental data on stability constants of proton (hydron) and metal complexes for seven complexones of particular biomedical and environmental interest: iminodiacetic acid [2,2'-azanediyldiacetic acid, IDA], (methylimino)diacetic acid [2,2'-(methylazanediyl)diacetic acid, MIDA]; 2,2',2'',2'''-{[(carboxymethyl)azanediyl]bis[(ethane-1,2-diyl)nitrilo]}tetraacetic acid (DTPA), 3,6,9,12-tetrakis(carboxymethyl)-3,6,9,12-tetraazatetradecanedioic acid (TTHA); 2,2',2''-(1,4,7-triazonane-1,4,7-triyl)triacetic acid (NOTA); 2,2',2'',2'''-(1,4,7,10-tetraazacyclododecane-1,4,7,10-tetrayl)tetraacetic acid (DOTA); 2,2',2'',2'''-(1,4,8,11-tetraazacyclotetradecane-1,4,8,11-tetrayl)tetraacetic acid (TETA), published in 1945-2000, have been critically evaluated. Some typical errors in stability constant measurements for particular complexones are summarized. Higher quality data are selected and presented as “Recommended” or “Provisional”.

Critical evaluation of stability constants of phosphonic acids (IUPAC Technical Report)

2001 ◽  
Vol 73 (10) ◽  
pp. 1641-1677 ◽  
Author(s):  
Konstantin Popov ◽  
Hannu Rönkkömäki ◽  
Lauri H. J. Lajunen
Keyword(s):  
Experimental Data ◽  
Metal Complexes ◽  
Stability Constants ◽  
Critical Evaluation ◽  
Protonation Constants ◽  
Quality Data ◽  
Methylphosphonic Acid ◽  
Phosphonic Acids ◽  
Technical Report

Available experimental data on stability constants of proton and metal complexes for 10 phosphonic acids [methylphosphonic acid, 1-hydroxyethane-1,1-diylbisphosphonic acid, dichloromethylenebisphosphonic acid, amino-methanephosphonic acid, N-(phosphonomethyl)glycine, imino-N,N-bis(methylenephosphonic acid), N-methylamino-N,N-bis(methylenephosphonic acid), nitrilotris(methylenephosphonic acid), 1,2-diaminoethane-N,N,N´,N´-tetrakis-(methylenephosphonic acid), and diethylenetriamine-N,N,N´,N´´,N´´-pentakis-(methylenephosphonic acid)], published in 1950­1997, have been critically evaluated. For the latter phosphonate, all the data are rejected, as well as protonation constants [HL]/[H][L] for three other ligands. Higher-quality data are selected and presented as "Recommended" and "Provisional".

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