scandium trifluoride

Formula: F₃Sc
Molecular weight: 101.951122
CAS Registry Number: 13709-47-2
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Ion clustering data

Data compiled as indicated in comments:
B - John E. Bartmess
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias

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Clustering reactions

+ F₃Sc = ( • F₃Sc)

By formula: F^- + F₃Sc = (F^- • F₃Sc)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	113.3 ± 3.6	kcal/mol	TDAs	Boltalina, Borshchevskii, et al., 1992	gas phase; Critical review; value altered from reference due to conversion from electron convention to ion convention; B
Δ_rH°	112.3 ± 2.4	kcal/mol	TDEq	Nikitin, Igolkina, et al., 1986	gas phase; Reanalyzed literature data, 4.3 kcal < AlF₃; B
Δ_rH°	116.5 ± 2.3	kcal/mol	TDEq	Nikitin, Sidorov, et al., 1981	gas phase; Fluoride Affinity: 4.1 kcal < AlF₃; value altered from reference due to conversion from electron convention to ion convention; B
Δ_rH°	118.2 ± 2.5	kcal/mol	TDEq	Skokan, Nikitin, et al., 1981	gas phase; Fluoride Affinity: 2.5 kcal < AlF₃.; value altered from reference due to conversion from electron convention to ion convention; B
Δ_rH°	112.	kcal/mol	MS	Pyatenko, Gusarov, et al., 1981	gas phase; Knudsen cell; M

F₄Sc^- + F₃Sc = F₇Sc₂^-

By formula: F₄Sc^- + F₃Sc = F₇Sc₂^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	54.50 ± 0.20	kcal/mol	TDAs	Nikitin, Sidorov, et al., 1981	gas phase; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	47.50 ± 0.30	kcal/mol	TDAs	Nikitin, Sidorov, et al., 1981	gas phase; B

+ F₃Sc = ( • F₃Sc)

By formula: Na⁺ + F₃Sc = (Na⁺ • F₃Sc)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	33.	kcal/mol	MS	Tsirlina, Gusarov, et al., 1986	gas phase; Knudsen cell; M

References

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Boltalina, Borshchevskii, et al., 1992
Boltalina, O.V.; Borshchevskii, A.Y.; Sidorov, L.N., Thermochemistry of 3d Elements Fluorides and Their Negative Ions in Gas Phase, Russ. J. Phys. Chem., 1992, 66, 1223. [all data]

Nikitin, Igolkina, et al., 1986
Nikitin, M.I.; Igolkina, N.A.; Skokan, E.V.; Sorokin, I.D.; Sidirov, L.N., Enthalpies of formation of the AlF₄^- ion, J. Phys. Chem., 1986, 60, 22. [all data]

Nikitin, Sidorov, et al., 1981
Nikitin, M.I.; Sidorov, L.N.; Skokan, E.V.; Sorokin, I.D., Mass spectrometric determination of the heats of formation of ScF₄- and KF₂-, Russ. J. Phys. Chem., 1981, 55, 1107. [all data]

Skokan, Nikitin, et al., 1981
Skokan, E.V.; Nikitin, M.I.; Sorokin, I.D.; Gusarov, A.V.; Sidirov, L.N., Determination of the heat of formation of the tetrafluoroscandate and pentfluorozirconate ions by the effusion nethod, Russ. J. Phys. Chem., 1981, 55, 1062. [all data]

Pyatenko, Gusarov, et al., 1981
Pyatenko, A.T.; Gusarov, A.V.; Gorokhov, L.N., Negative Ions in the Vapor Over Lanthanum Trifluoride, High Temp., 1981, 19, 241. [all data]

Tsirlina, Gusarov, et al., 1986
Tsirlina, E.A.; Gusarov, A.V.; Gorokhov, L.N., High Temp., 1986, 14, 1064. [all data]

Notes

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Symbols used in this document:

Δ_rG° Free energy of reaction at standard conditions

Δ_rH° Enthalpy of reaction at standard conditions
Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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Δ_rG°	Free energy of reaction at standard conditions
Δ_rH°	Enthalpy of reaction at standard conditions