ABSTRACT

Solid adducts of formula SbI3 EL [L = 2-amino-3-methylpyridine (2A3P), 2-amino-4-methylpyridine (2A4P), 2-amino-5-methylpyridine (2A5P), 2-amino-6-methylpyridine (2A6P)] were synthesized and characterized by elemental analysis, IR spectroscopy, thermogravimetry and DSC. Thermochemical parameters of the adducts were determined through solution-reaction calorimetry. The ratio metal.ligandwas 1:1 for all adducts based on elemental analysis. Infrared results showed that the ligands coordinate to antimony through the nitrogen atom of the aromatic ring. Thermal degradation of adducts starts at 112, 122, 188, and 137 .C for SbI32AxP (where x = 3, 4, 5 and 6, respectively). Decomposition temperatures correlate with metal.ligand bond strength. The enthalpy of reaction: SbI3(c) + nL(c,l) = SbI3 *nL (solid) DrH.m (solid) is -97.45, -56.43, -73.56 and -81.45 kJ mol-1, respectively, for 2A3P, 2A4P, 2A5P and 2A6P adducts. The standard enthalpies of decomposition, as well as the lattice enthalpies and the enthalpies of the Lewis acid.base reaction in the gas phase were calculated through thermochemical cycles. The standard mean antimony-nitrogen bond enthalpies in SbI3 *2A3P, SbI3 *2A4P, SbI3 *2A5P, and SbI3 *2A6P were estimated as 175, 135, 154, and 164 kJ mol-1, respectively.

Compounds

#	Formula	Name
1	I3Sb	antimony iodide (SbI3)
2	C6H8N2	2-amino-3-methylpyridine
3	C6H8N2	2-amino-4-methylpyridine
4	C6H8N2	2-amino-5-methylpyridine
5	C6H8N2	2-amino-6-methylpyridine
6	C6H8I3N2Sb	antimony triiodide - 2-amino-3-methylpyridine complex (1:1)
7	C6H8I3N2Sb	antimony triiodide - 2-amino-4-methylpyridine complex (1:1)
8	C6H8I3N2Sb	antimony triiodide - 2-amino-5-methylpyridine complex (1:1)
9	C6H8I3N2Sb	triiodo(6-methyl-2-pyridinamine)antimony
10	C4H9NO	N,N-dimethylethanamide

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	Variable	Phase	Method	#Points
POMD	10 1	Molar enthalpy of solution, kJ/mol ; Liquid	Mole fraction - 1; Liquid Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	ISOPERIBOL:solid	1
RXND	2 1 6	Molar enthalpy of reaction, kJ/mol			Solution calorimetry	1
RXND	3 1 7	Molar enthalpy of reaction, kJ/mol			Solution calorimetry	1
RXND	4 1 8	Molar enthalpy of reaction, kJ/mol			Solution calorimetry	1
RXND	5 1 9	Molar enthalpy of reaction, kJ/mol			Solution calorimetry	1

Thermodynamics Research Center / ThermoML | Thermochimica Acta

Adducts of antimony triiodide and 2-aminomethylpyridines: Synthesis, characterization and thermochemistry

dos Santos, A. P.[Adeilton Pereira], da Fonseca, M. G.[Maria Gardennia], de Paiva Espynola, J. G.[Jose Geraldo], de Oliveira, S. F.[Severino Francisco], Arakaki, L. N. H.

ABSTRACT