Chemical Thermodynamics of Tin - Volume 12 - OECD Nuclear ...

192
VIII Group 17 (halogen) compounds and complexes
concentrations. Since reliable experimental data are available only for I = 4.0 M,
thermodynamic formation constants cannot be selected.
Table VIII-12: Experimental formation constants of the species SnI
Method Ionic media t/°C log10
Sn 2+ + I – SnI +
Reported Recalculated (a) Accepted (b)
β
q
2 − q
q
.
Reference
sol 4.0 M NaClO 4 25 0.7 ± 0.05 0.75 ± 0.30 0.75 ± 0.30 [1968HAI/JOH]
Ise-Sn 1.0 M NaClO 4 25 0.76 ± 0.02 [1976SAM/LYA]
Sn 2+ + 2 I – SnI 2 (aq)
sol 4.0 M NaClO 4 25 1.13 ± 0.07 1.14 ± 0.30 1.14 ± 0.30 [1968HAI/JOH]
Ise-Sn 1.0 M NaClO 4 25 1.15 ± 0.07 [1976SAM/LYA]
Sn 2+ + 3 I – SnI −
3
sol 4.0 M NaClO 4 25 2.13 ± 0.03 1.60 ± 0.30 1.60 ± 0.30 [1968HAI/JOH]
Ise-Sn 1.0 M NaClO 4 25 2.10 ± 0.04 [1976SAM/LYA]
Sn 2+ + 4 I – SnI 2−
4
sol 4.0 M NaClO 4 25 2.30 ± 0.04 2.69 ± 0.50 2.69 ± 0.50 [1968HAI/JOH]
Sn 2+ + 6 I –
4
SnI −
6
sol 4.0 M NaClO 4 25 2.59 ± 0.02 [1968HAI/JOH]
Sn 2+ + 8 I – SnI 6−
8
sol 4.0 M NaClO 4 25 2.08 ± 0.04 [1968HAI/JOH]
(a) Re-evaluated values (see Appendix A), the uncertainties are estimated by the reviewers.
(b) Accepted values corrected to molal scale. The accepted values reported in Appendix A are expressed on
the molar or molal scales, depending on which units were used originally by the authors.
VIII.3.4.2 Aqueous tin(IV) iodides
Apparently, no thermodynamic data are available for the aqueous iodido complexes of
tin(IV).
VIII.3.5 Mixed halogen complexes
VIII.3.5.1 Mixed halogeno complexes of tin(II)
As mentioned in Section VIII.3, all the ten trihalogenostannate(II) anions ([SnCl x Br y I z ] – ,
x + y + z = 3) have been identified by 119 Sn NMR in [1989COD/TAY]. However,
thermodynamic data are available only for the chlorido-bromido ternary complexes
(Table VIII-13). The broader sense of mixed halogeno complexes includes the
CHEMICAL THERMODYNAMICS OF TIN, ISBN 978-92-64-99206-1, © OECD 2012