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Hydrolysis of methyltin(IV) trichloride in aqueous NaCl and NaNO 3 solutions at different ionic strengths and temperatures
Author(s) -
Stefano Concetta De,
Foti Claudia,
Gianguzza Antonio,
Marrone Francesca,
Sammartano Silvio
Publication year - 1999
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/(sici)1099-0739(199911)13:11<805::aid-aoc887>3.0.co;2-w
Subject(s) - chemistry , hydrolysis , aqueous solution , potentiometric titration , ionic strength , glass electrode , ionic bonding , inorganic chemistry , analytical chemistry (journal) , ion , electrode , electrochemistry , chromatography , organic chemistry , reference electrode
The hydrolysis of methyltin(IV) trichloride (CH 3 SnCl 3 ) has been studied in aqueous NaCl and NaNO 3 solutions (0 < I /mol dm −3 ≤ 1), at different temperatures (15 ≤ T /°C ≤ 45) bypotentiometric measurements (H + ‐glass electrode). By considering the generic hydrolytic reaction p CH 3 Sn 3+ + q H 2 O = (CH 3 Sn) p (OH) q 3 p − q + q H + (logβ pq ), we have the formation of five species and logβ 12 = −3.36, logβ 13 = −8.99, logβ 14 = −20.27 and logβ 25 = −7.61. The first hydrolysis step is measurable only at very low pH values and was not determined: a rough estimate of the hydrolysis constant is logβ 11 = −1.5 (± 0.5). The dependence on ionic strength of logβ pq is quite different in NaNO 3 and NaCl solutions, and the formation at low pH values of the species CH 3 Sn(OH)Cl + has been found with logβ = −1.40. Hydrolysis constants strongly depend on temperature and from the relationships logβ pq = f ( T ), Δ H ° values have been calculated. Speciation problems of CH 3 Sn 3+ in aqueous solution are discussed. Copyright © 1999 John Wiley & Sons, Ltd.