Heat capacities and thermodynamics of formation of flat-Al13 nitrate - [Al13(OH)24(H2O)24](NO3)15·11H2O

Dana Reusser; Jacob Schliesser; William S. Elliott; Brian F. Woodfield; Darren W. Johnson; Alexandra Navrotsky

doi:10.1016/j.jct.2015.06.037

Heat capacities and thermodynamics of formation of flat-Al₁₃ nitrate - [Al₁₃(OH)₂₄(H₂O)₂₄](NO₃)₁₅·11H₂O

Dana Reusser, Jacob Schliesser, William S. Elliott, Brian F. Woodfield, Darren W. Johnson, Alexandra Navrotsky

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

Abstract We report enthalpies of formation from the elements and oxides, ^Δf^Hâ = -(26195.31 ± 34.46) kJ · mol^-1 and ^Δf,oxH = -(1402.09 ± 33.36) kJ · mol^-1, for crystalline [Al₁₃(μ₃-OH)₆(μ₂-OH)₁₈(H₂O)₂₄](NO₃)₁₅·11H₂O_(cr) (flat-Al₁₃) measured using aqueous solution room temperature calorimetry. This material is a nitrate salt of a polynuclear aluminum hydroxide ion with thirteen aluminum metal centers, Al₁₃¹⁵⁺. Unlike the ε-Al₁₃⁷⁺ Keggin ion, it contains solely octahedrally coordinated aluminum in a more flat topology. We also report heat capacities from temperatures of (2 to 300) K on this flat-Al₁₃ nitrate using a Quantum Design Physical Property Measurement System (PPMS). These measurements were used to calculate the standard molar entropy and subsequently the free energy of formation for this material. We observed that during the heat capacity measurements, the flat-Al₁₃ sample underwent a second order phase transition near T = 214 K.

Original language	English (US)
Article number	4296
Pages (from-to)	224-231
Number of pages	8
Journal	Journal of Chemical Thermodynamics
Volume	90
DOIs	https://doi.org/10.1016/j.jct.2015.06.037
State	Published - Jul 22 2015
Externally published	Yes

Keywords

Enthalpy of formation
Flat Al
Heat capacity
Keggin ion
Polyoxocation

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Materials Science(all)
Physical and Theoretical Chemistry

Access to Document

10.1016/j.jct.2015.06.037

Cite this

@article{6de96f7be0784a88855c9db38329ff9b,

title = "Heat capacities and thermodynamics of formation of flat-Al13 nitrate - [Al13(OH)24(H2O)24](NO3)15·11H2O",

abstract = "Abstract We report enthalpies of formation from the elements and oxides, ΔfH{\^a} = -(26195.31 ± 34.46) kJ · mol-1 and Δf,oxH = -(1402.09 ± 33.36) kJ · mol-1, for crystalline [Al13(μ3-OH)6(μ2-OH)18(H2O)24](NO3)15·11H2O(cr) (flat-Al13) measured using aqueous solution room temperature calorimetry. This material is a nitrate salt of a polynuclear aluminum hydroxide ion with thirteen aluminum metal centers, Al1315+. Unlike the ε-Al137+ Keggin ion, it contains solely octahedrally coordinated aluminum in a more flat topology. We also report heat capacities from temperatures of (2 to 300) K on this flat-Al13 nitrate using a Quantum Design Physical Property Measurement System (PPMS). These measurements were used to calculate the standard molar entropy and subsequently the free energy of formation for this material. We observed that during the heat capacity measurements, the flat-Al13 sample underwent a second order phase transition near T = 214 K.",

keywords = "Enthalpy of formation, Flat Al, Heat capacity, Keggin ion, Polyoxocation",

author = "Dana Reusser and Jacob Schliesser and Elliott, {William S.} and Woodfield, {Brian F.} and Johnson, {Darren W.} and Alexandra Navrotsky",

note = "Publisher Copyright: {\textcopyright} 2015 Elsevier Ltd.",

year = "2015",

month = jul,

day = "22",

doi = "10.1016/j.jct.2015.06.037",

language = "English (US)",

volume = "90",

pages = "224--231",

journal = "Journal of Chemical Thermodynamics",

issn = "0021-9614",

publisher = "Academic Press Inc.",

}

TY - JOUR

T1 - Heat capacities and thermodynamics of formation of flat-Al13 nitrate - [Al13(OH)24(H2O)24](NO3)15·11H2O

AU - Reusser, Dana

AU - Schliesser, Jacob

AU - Elliott, William S.

AU - Woodfield, Brian F.

AU - Johnson, Darren W.

AU - Navrotsky, Alexandra

PY - 2015/7/22

Y1 - 2015/7/22

N2 - Abstract We report enthalpies of formation from the elements and oxides, ΔfHâ = -(26195.31 ± 34.46) kJ · mol-1 and Δf,oxH = -(1402.09 ± 33.36) kJ · mol-1, for crystalline [Al13(μ3-OH)6(μ2-OH)18(H2O)24](NO3)15·11H2O(cr) (flat-Al13) measured using aqueous solution room temperature calorimetry. This material is a nitrate salt of a polynuclear aluminum hydroxide ion with thirteen aluminum metal centers, Al1315+. Unlike the ε-Al137+ Keggin ion, it contains solely octahedrally coordinated aluminum in a more flat topology. We also report heat capacities from temperatures of (2 to 300) K on this flat-Al13 nitrate using a Quantum Design Physical Property Measurement System (PPMS). These measurements were used to calculate the standard molar entropy and subsequently the free energy of formation for this material. We observed that during the heat capacity measurements, the flat-Al13 sample underwent a second order phase transition near T = 214 K.

AB - Abstract We report enthalpies of formation from the elements and oxides, ΔfHâ = -(26195.31 ± 34.46) kJ · mol-1 and Δf,oxH = -(1402.09 ± 33.36) kJ · mol-1, for crystalline [Al13(μ3-OH)6(μ2-OH)18(H2O)24](NO3)15·11H2O(cr) (flat-Al13) measured using aqueous solution room temperature calorimetry. This material is a nitrate salt of a polynuclear aluminum hydroxide ion with thirteen aluminum metal centers, Al1315+. Unlike the ε-Al137+ Keggin ion, it contains solely octahedrally coordinated aluminum in a more flat topology. We also report heat capacities from temperatures of (2 to 300) K on this flat-Al13 nitrate using a Quantum Design Physical Property Measurement System (PPMS). These measurements were used to calculate the standard molar entropy and subsequently the free energy of formation for this material. We observed that during the heat capacity measurements, the flat-Al13 sample underwent a second order phase transition near T = 214 K.

KW - Enthalpy of formation

KW - Flat Al

KW - Heat capacity

KW - Keggin ion

KW - Polyoxocation

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