ENTHALPIES OF COMBUSTION OF 4-NITROPYRIDINE N-OXIDE AND PYRIDINE-3-CARBOXYLIC ACID N-OXIDE - THE DISSOCIATION ENTHALPIES OF THE N-O BONDS IN PYRIDINE N-OXIDE DERIVATIVES

被引:39
作者
ACREE, WE
TUCKER, SA
DASILVA, MDMCR
MATOS, MAR
GONCALVES, JM
DASILVA, MAVR
PILCHER, G
机构
[1] UNIV PORTO, FAC CIENCIAS, DEPT QUIM, P-4000 OPORTO, PORTUGAL
[2] UNIV MANCHESTER, DEPT CHEM, MANCHESTER M13 9PL, LANCS, ENGLAND
关键词
D O I
10.1006/jcht.1995.0038
中图分类号
O414.1 [热力学];
学科分类号
摘要
The standard (p(o) = 0.1 MPa) enthalpies of combustion at the temperature T = 298.15 K were measured by static-bomb calorimetry for crystalline 4-nitropyridine N-oxide and for pyridine-3-carboxylic acid N-oxide. The standard enthalpies of sublimation at T = 298.15 K were measured for 4-nitropyridine N-oxide by microcalorimetry and for pyridine-3-carboxylic acid N-oxide by a mass-loss effusion technique. -Delta(c)H(m)(o)(cr)/(kJ.mol(-1)) Delta(cr)(g)H(m)(o)(kJ.mol(-1)) 4-O2N-c-C-5 H4NO 2556.3 +/- 0.5 108.9 +/- 0.3 3-HO2C-c-C5H4NO 2698.2 +/- 0.7 152.3 +/- 1.9 From the standard molar enthalpies of formation of the gaseous compounds, the molar dissociation enthalpies of the (N-O) bonds were derived: D(N-O)/(kJ.mol(-1)) in 4-O2N-c-C5H4NO, 258.5 +/- 5.3; in 3-HO2C-c-C5H4NO, 252.8 +/- 2.7. The standard molar enthalpies of sublimation of 2-H3C-c-C5H4NO and 3-H3C-c-C5H4NO were measured by microcalorimetry: (78.2 +/- 2.2) kJ.mol(-1) and (82.2 +/- 2.4) kJ.mol(-1), respectively, permitting the comparison of D(N-O) values in several pyridine N-oxide derivatives.
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页码:391 / 398
页数:8
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