General trends in phase transitions in an homologous series. Polymorphism in (n-C6H13NH3)2MnCl4 as determined by adiabatic calorimetry from 18 K to 313 K

Autor:	Mary Anne White, M. J. M. Van Oort
Rok vydání:	1985
Předmět:	chemistry.chemical_classification Phase transition Stereochemistry General Chemistry Calorimetry Heat capacity Crystallography Homologous series chemistry.chemical_compound chemistry Polymorphism (materials science) Adiabatic process Inorganic compound Alkyl
Zdroj:	Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases. 81:3059
ISSN:	0300-9599
DOI:	10.1039/f19858103059
Popis:	The heat capacity of (n-C6H13NH3)2MnCl4 has been measured by adiabatic calorimetry from 18 to 313 K. Two structural phase transitions were observed in this compound at Ttr= 206.3 ± 0.1 K (ΔHtr= 5311 ± 38 J mol–1, ΔStr= 25.73 ± 0.2 J K–1 mol–1) and at Ttr= 290.9 ± 0.05 K (ΔHtr= 10035 ± 24 J mol–1, ΔStr= 37.17 ± 0.1 J K–1 mol–1). From comparison with results for the other members of this series with longer alkyl chains, it is concluded that the general trends in their phase transitions are only observed when the number of carbons in the alkyl chains exceeds six.
Databáze:	OpenAIRE
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