Low-temperature thermodynamic properties of dimeric tris(2,2,6,6-tetramethyl-3,5-heptanedionato) europium

M. A. Bespyatov; I. S. Cherniaikin; P. A. Stabnikov; A. R. Tsygankova; T. M. Kuzin; N. V. Gelfond

doi:10.1016/j.jct.2019.105904

Low-temperature thermodynamic properties of dimeric tris(2,2,6,6-tetramethyl-3,5-heptanedionato) europium

M. A. Bespyatov, I. S. Cherniaikin, P. A. Stabnikov, A. R. Tsygankova, T. M. Kuzin, N. V. Gelfond

Analytical Chemistry Section

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

2 Citations (Scopus)

Abstract

A sample of dimeric tris(2,2,6,6-tetramethyl-3,5-heptanedionato) europium ([Eu(C₁₁H₁₉O₂)₃]₂ or dipivaloylmethanate europium) was synthesized. Chemical analysis, elemental analysis and X-ray crystallography were used to characterize composition and structure of the complex. Low-temperature heat capacity of the sample was measured by adiabatic method in a temperature range from 8.63 K to 312.90 K. The Debye temperature at 0 K was calculated. Thermodynamic functions (entropy, enthalpy, reduced Gibbs energy) in a range (0–312) K have been calculated using the obtained experimental heat capacity data. An anomaly in the functional behaviour of heat capacity was detected in a temperature range from 250 K to 270 K, with a maximum at T_c = (262.36 ± 0.01) K. A reversible colour change (thermochromism) of europium dipivaloylmethanate crystals upon cooling below 245 K was detected. Anomalous contributions to entropy and enthalpy have been revealed. The nature of the effects detected is discussed.

Original language	English
Article number	105904
Number of pages	6
Journal	Journal of Chemical Thermodynamics
Volume	140
DOIs	https://doi.org/10.1016/j.jct.2019.105904
Publication status	Published - 1 Jan 2020

Keywords

Adiabatic calorimetry
Europium (III) beta-diketonates
Low-temperature heat capacity
Thermochromism
Thermodynamic functions
TRANSITION
VIBRATION-SPECTRA
HEAT-CAPACITY
DEPENDENCE

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@article{dc1940717238446ab3dc31bb4f541b45,

title = "Low-temperature thermodynamic properties of dimeric tris(2,2,6,6-tetramethyl-3,5-heptanedionato) europium",

abstract = "A sample of dimeric tris(2,2,6,6-tetramethyl-3,5-heptanedionato) europium ([Eu(C11H19O2)3]2 or dipivaloylmethanate europium) was synthesized. Chemical analysis, elemental analysis and X-ray crystallography were used to characterize composition and structure of the complex. Low-temperature heat capacity of the sample was measured by adiabatic method in a temperature range from 8.63 K to 312.90 K. The Debye temperature at 0 K was calculated. Thermodynamic functions (entropy, enthalpy, reduced Gibbs energy) in a range (0–312) K have been calculated using the obtained experimental heat capacity data. An anomaly in the functional behaviour of heat capacity was detected in a temperature range from 250 K to 270 K, with a maximum at Tc = (262.36 ± 0.01) K. A reversible colour change (thermochromism) of europium dipivaloylmethanate crystals upon cooling below 245 K was detected. Anomalous contributions to entropy and enthalpy have been revealed. The nature of the effects detected is discussed.",

keywords = "Adiabatic calorimetry, Europium (III) beta-diketonates, Low-temperature heat capacity, Thermochromism, Thermodynamic functions, TRANSITION, VIBRATION-SPECTRA, HEAT-CAPACITY, DEPENDENCE",

author = "Bespyatov, {M. A.} and Cherniaikin, {I. S.} and Stabnikov, {P. A.} and Tsygankova, {A. R.} and Kuzin, {T. M.} and Gelfond, {N. V.}",

year = "2020",

month = jan,

day = "1",

doi = "10.1016/j.jct.2019.105904",

language = "English",

volume = "140",

journal = "Journal of Chemical Thermodynamics",

issn = "0021-9614",

publisher = "Academic Press Inc.",

}

TY - JOUR

T1 - Low-temperature thermodynamic properties of dimeric tris(2,2,6,6-tetramethyl-3,5-heptanedionato) europium

AU - Bespyatov, M. A.

AU - Cherniaikin, I. S.

AU - Stabnikov, P. A.

AU - Tsygankova, A. R.

AU - Kuzin, T. M.

AU - Gelfond, N. V.

PY - 2020/1/1

Y1 - 2020/1/1

N2 - A sample of dimeric tris(2,2,6,6-tetramethyl-3,5-heptanedionato) europium ([Eu(C11H19O2)3]2 or dipivaloylmethanate europium) was synthesized. Chemical analysis, elemental analysis and X-ray crystallography were used to characterize composition and structure of the complex. Low-temperature heat capacity of the sample was measured by adiabatic method in a temperature range from 8.63 K to 312.90 K. The Debye temperature at 0 K was calculated. Thermodynamic functions (entropy, enthalpy, reduced Gibbs energy) in a range (0–312) K have been calculated using the obtained experimental heat capacity data. An anomaly in the functional behaviour of heat capacity was detected in a temperature range from 250 K to 270 K, with a maximum at Tc = (262.36 ± 0.01) K. A reversible colour change (thermochromism) of europium dipivaloylmethanate crystals upon cooling below 245 K was detected. Anomalous contributions to entropy and enthalpy have been revealed. The nature of the effects detected is discussed.

AB - A sample of dimeric tris(2,2,6,6-tetramethyl-3,5-heptanedionato) europium ([Eu(C11H19O2)3]2 or dipivaloylmethanate europium) was synthesized. Chemical analysis, elemental analysis and X-ray crystallography were used to characterize composition and structure of the complex. Low-temperature heat capacity of the sample was measured by adiabatic method in a temperature range from 8.63 K to 312.90 K. The Debye temperature at 0 K was calculated. Thermodynamic functions (entropy, enthalpy, reduced Gibbs energy) in a range (0–312) K have been calculated using the obtained experimental heat capacity data. An anomaly in the functional behaviour of heat capacity was detected in a temperature range from 250 K to 270 K, with a maximum at Tc = (262.36 ± 0.01) K. A reversible colour change (thermochromism) of europium dipivaloylmethanate crystals upon cooling below 245 K was detected. Anomalous contributions to entropy and enthalpy have been revealed. The nature of the effects detected is discussed.

KW - Adiabatic calorimetry

KW - Europium (III) beta-diketonates

KW - Low-temperature heat capacity

KW - Thermochromism

KW - Thermodynamic functions

KW - TRANSITION

KW - VIBRATION-SPECTRA

KW - HEAT-CAPACITY

KW - DEPENDENCE

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DO - 10.1016/j.jct.2019.105904

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