Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 85: Issue 2

Heat capacity of α-glycylglycine in a temperature range of 6 to 440 K Comparison with glycines

Authors:
V. Drebushchak Novosibirsk State University ‘Molecular Design and Ecologically Safe Technologies’ REC-008 Novosibirsk Russia 630090 Ul. Pirogova 2 Novosibirsk Russia 630090 Ul. Pirogova 2

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Yu. Kovalevskaya Institute of Inorganic Chemistry SB RAS Novosibirsk Russia 630090 Pr. Ac. Lavrentieva 3 Novosibirsk Russia 630090 Pr. Ac. Lavrentieva 3

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I. Paukov Institute of Inorganic Chemistry SB RAS Novosibirsk Russia 630090 Pr. Ac. Lavrentieva 3 Novosibirsk Russia 630090 Pr. Ac. Lavrentieva 3

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E. Boldyreva Institute of Solid State Chemistry and Mechanochemistry SB RAS Novosibirsk Russia 630128 Ul. Kutateladze 3 Novosibirsk Russia 630128 Ul. Kutateladze 3

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Pages:
485–490
Online Publication Date:
07 Sep 2006
Publication Date:
01 Aug 2006
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-006-7680-5
Keywords:
adiabatic calorimetry; DSC; glycine; glycylglycine; heat capacity; molecular crystals
Restricted access

Abstract  

Heat capacity of α-glycylglycine was measured using adiabatic calorimetry (6 to 304 K) and DSC (264 to 443 K), and then thermodynamic functions were calculated. Heat capacity has no anomalies. The molecular crystal melts at 493 K (enthalpy of melting is about 62 kJ mol–1). The melting is accompanied by decomposition. CP(T) function for glycylglycine is very similar to those of three glycine polymorphs. The ‘universal’ curve consists of two parts: low-temperature Debye-like function (from 0 to about 120 K) and a straight line (up to the melting point). At very low temperatures rigid molecules oscillate as a whole, and the Debye temperature is proportional to the molecular mass to the power of 3/2.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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