UNSPECIFIED. (2003) Estimation of enthalpy data for reactions involving gas phase ions utilizing lattice potential energies: Fluoride ion affinities (FIA) and pF(-) values of mSbF(5)(I) and mSbF(5)(g) (m=1, 2, 3), AsF5(g), AsF5 center dot SO2(C). Standard enthalpies of formation: Delta H-f degrees(SbmF5m+1-,g) (m=1, 2, 3), Delta H-f degrees(AsF6-,g), and Delta H-f degrees(NF4+,g). INORGANIC CHEMISTRY, 42 (9). pp. 2886-2893. ISSN 0020-1669

Full text not available from this repository.

Abstract

Fluoride ion affinity (FIA) values (and the associated pF(-) values) are difficult to establish experimentally for pentafluorides of arsenic and antimony. Our approach, utilizing estimated lattice potential energies, provides a further opportunity to establish this data for liquid (and gaseous) SbF5 and gaseous AsF5 which compliments values obtained using ab initio routes for monomeric gas phase molecules and adds to results based on rigorous methods. A strategy is developed whereby construction of (multiple) Born-Fajans-Haber cycles centered around the (target) FIA reaction of interest yield a plethora of estimates for the enthalpy change of interest. This general approach is illustrated here by specific estimation of some experimentally based FIA values of SbF5 and AsF5. FIA values/kJ mol(-1) and pF(-) values estimated in this paper are FIA(SbF5,I) approximate to -475 (+/-63), pF(-)(SbF5,I) = 11.4 (+/-1.5); FIA(SbF5,g) approximate to -506 (+/-63), pF(-)(SbF5,g) = 12.4 (+/-1.5); FIA(2SbF(5),I) approximate to -609 (+/-63), pF(-) (2SbF(5),I) = 14.6 (+/-1.5); FIA (2SbF(5),g) approximate to -671 (+/-63), pF(-) (2SbF(5),g) = 16.0 (+/-1.5); FIA (3SbF(5),I) approximate to -635 (+/-39), pF(-) (3SbF(5),I) = 15.2 (+/-0.9); FIA (3SbF(5),g) approximate to -728 (+/-39), pF(-) (3SbF(5),g) = 17.4 (+/-0.9); FIA (AsF5,g) approximate to -421 (+/-22), pF(-) (AsF5,g) = 10.1 (+/-0.5); and FIA (AsF5.SO2,s) approximate to -390 (+/-22), pF(-) (AsF5.SO2,s) = 9.3 (+/-0.5). Related standard enthalpies of formation (in W mol(-1)) are also assigned: Delta(f)H(o)(SbF6-,g) approximate to -2075 (+/-52); Delta(f)H(o)(Sb2F11-,g) approximate to -3520 (+/-63); Delta(f)H(o)(Sb3F16-,g) approximate to -4874 (+/-39); Delta(f)H(o)(NF4+,g) approximate to 903 (+/-32); Delta(f)H(o)(AsF6-,g) approximate to -1907 (+/-22).

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry
Journal or Publication Title:	INORGANIC CHEMISTRY
Publisher:	AMER CHEMICAL SOC
ISSN:	0020-1669
Date:	5 May 2003
Volume:	42
Number:	9
Number of Pages:	8
Page Range:	pp. 2886-2893
Identification Number:	10.1021/ic0206544
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/9769

Data sourced from Thomson Reuters' Web of Knowledge

Request changes to a record

Actions (login required)

View Item