ABSTRACT

Fusion and solid-to-solid transitions of a homologous series of 11 alkane-a,x-dinitriles NC-(CH2)n-CN, where n = (1 to 10 and 12), were investigated by differential scanning calorimetry (d.s.c.). The temperatures of fusion increased as a function of the number of carbon atoms in the alkyl chains and showed a marked odd even effect with even terms displaying higher values. Molar and massic enthalpies and entropies of fusion also showed odd even alternation. Solid-to-solid transitions were detected for all compounds, except dodecanedinitrile. Comparison was made with the literature values for temperatures, enthalpies, and entropies of fusion of linear alkanes and alkane-a,w-diamines.

Compounds

#	Formula	Name
1	C3H2N2	propanedinitrile
2	C4H4N2	butanedinitrile
3	C5H6N2	pentanedinitrile
4	C6H8N2	hexanedinitrile
5	C7H10N2	heptanedinitrile
6	C8H12N2	octanedinitrile
7	C9H14N2	nonanedinitrile
8	C10H16N2	decanedinitrile
9	C11H18N2	undecanodinitrile
10	C12H20N2	dodecanedinitrile
11	C14H24N2	tetradecanedinitrile

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Phase	Method	#Points
POMD	1	Molar enthalpy of transition or fusion, kJ/mol ; Crystal 1	Crystal 1 Liquid Air at 1 atmosphere	DSC	1
POMD	1	Molar enthalpy of transition or fusion, kJ/mol ; Crystal 4	Crystal 4 Crystal 3 Air at 1 atmosphere	DSC	1
POMD	1	Triple point temperature, K ; Crystal 4	Crystal 4 Crystal 3 Air at 1 atmosphere	DTA	1
POMD	1	Triple point temperature, K ; Crystal 3	Crystal 3 Crystal 2 Air at 1 atmosphere	DTA	1
POMD	1	Triple point temperature, K ; Crystal 2	Crystal 2 Crystal 1 Air at 1 atmosphere	DTA	1
POMD	1	Normal melting temperature, K ; Crystal 1	Crystal 1 Liquid Air at 1 atmosphere	DTA	1
POMD	2	Molar enthalpy of transition or fusion, kJ/mol ; Crystal 1	Crystal 1 Liquid Air at 1 atmosphere	DSC	1
POMD	2	Molar enthalpy of transition or fusion, kJ/mol ; Crystal 2	Crystal 2 Crystal 1 Air at 1 atmosphere	DSC	1
POMD	2	Triple point temperature, K ; Crystal 2	Crystal 2 Crystal 1 Air at 1 atmosphere	DTA	1
POMD	2	Normal melting temperature, K ; Crystal 1	Crystal 1 Liquid Air at 1 atmosphere	DTA	1
POMD	3	Molar enthalpy of transition or fusion, kJ/mol ; Crystal	Crystal Liquid Air at 1 atmosphere	DSC	1
POMD	3	Normal melting temperature, K ; Crystal	Crystal Liquid Air at 1 atmosphere	DTA	1
POMD	4	Molar enthalpy of transition or fusion, kJ/mol ; Crystal 1	Crystal 1 Liquid Air at 1 atmosphere	DSC	1
POMD	4	Triple point temperature, K ; Crystal 2	Crystal 2 Crystal 1 Air at 1 atmosphere	DTA	1
POMD	4	Normal melting temperature, K ; Crystal 1	Crystal 1 Liquid Air at 1 atmosphere	DTA	1
POMD	5	Molar enthalpy of transition or fusion, kJ/mol ; Crystal 1	Crystal 1 Liquid Air at 1 atmosphere	DSC	1
POMD	5	Triple point temperature, K ; Crystal 2	Crystal 2 Crystal 1 Air at 1 atmosphere	DTA	1
POMD	5	Normal melting temperature, K ; Crystal 1	Crystal 1 Liquid Air at 1 atmosphere	DTA	1
POMD	6	Molar enthalpy of transition or fusion, kJ/mol ; Crystal 1	Crystal 1 Liquid Air at 1 atmosphere	DSC	1
POMD	6	Triple point temperature, K ; Crystal 2	Crystal 2 Crystal 1 Air at 1 atmosphere	DTA	1
POMD	6	Normal melting temperature, K ; Crystal 1	Crystal 1 Liquid Air at 1 atmosphere	DTA	1
POMD	7	Molar enthalpy of transition or fusion, kJ/mol ; Crystal	Crystal Liquid Air at 1 atmosphere	DSC	1
POMD	7	Normal melting temperature, K ; Crystal	Crystal Liquid Air at 1 atmosphere	DTA	1
POMD	8	Molar enthalpy of transition or fusion, kJ/mol ; Crystal 1	Crystal 1 Liquid Air at 1 atmosphere	DSC	1
POMD	8	Triple point temperature, K ; Crystal 2	Crystal 2 Crystal 1 Air at 1 atmosphere	DTA	1
POMD	8	Normal melting temperature, K ; Crystal 1	Crystal 1 Liquid Air at 1 atmosphere	DTA	1
POMD	9	Molar enthalpy of transition or fusion, kJ/mol ; Crystal	Crystal Liquid Air at 1 atmosphere	DSC	1
POMD	9	Normal melting temperature, K ; Crystal	Crystal Liquid Air at 1 atmosphere	DTA	1
POMD	10	Molar enthalpy of transition or fusion, kJ/mol ; Crystal	Crystal Liquid Air at 1 atmosphere	DSC	1
POMD	10	Normal melting temperature, K ; Crystal	Crystal Liquid Air at 1 atmosphere	DTA	1
POMD	11	Molar enthalpy of transition or fusion, kJ/mol ; Crystal 1	Crystal 1 Liquid Air at 1 atmosphere	DSC	1
POMD	11	Molar enthalpy of transition or fusion, kJ/mol ; Crystal 2	Crystal 2 Crystal 1 Air at 1 atmosphere	DSC	1
POMD	11	Triple point temperature, K ; Crystal 2	Crystal 2 Crystal 1 Air at 1 atmosphere	DTA	1
POMD	11	Normal melting temperature, K ; Crystal 1	Crystal 1 Liquid Air at 1 atmosphere	DTA	1

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Fusion and solid-to-solid transitions of a homologous series of alkane-a,w-dinitriles

Badea, E.[Elena], Blanco, I.[Ignazio], Della Gatta, G.[Giuseppe]

ABSTRACT