Enthalpies of combustion of 2-iodosobenzoic acid and 4-nitrosophenol: the dissociation enthalpy of the I-O bond Page: 1,551
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.1. Chem. TheCrmodnvlIClIiCS 1999, 31, 1551-1559
Article No. jcht. 1 999.0554
Available online at http://www.idealibrary.com on IDE *
Enthalpies of combustion of 2-iodosobenzoic acid
and 4-nitrosophenol: the dissociation enthalpy of
the 1-0 bond
Maria D. M. C. Ribeiro da Silva,a M. Agostinha R. Matos,
Maria Luisa C. C. H. Ferrao, Luisa M. P. F. Amaral, Margarida
S. Miranda,
Centro de Investigasco em Quimica, Departanmento de Quinica, Faculdade
de Ciinc'ias, Universidade do Porto, Ruca do Campo Alegre, 687,
P-4 / 69-007 Porto, Portugal
W. E. Acree Jr,
Department of Chenzistry, University of North Texas, Denton
7X 76203-0068, U.S.A.
and G. Pilcher
Department of Chemistry, University of Manchester Manchester, A 13 9PL
U.K.
The standard (p" = 0. IMPa) molar enthalpies of combustion in oxygen, at ' =
298.15 K. for crystalline 2-iodosobenzoic acid, (OI)C6H4COOH, and 4-nitrosophenol,
(ON)C(1 H40H, were measured by rotating-bomb calorimetry and static-bomb calorimetry,
respectively. These values were used to derive the standard molar enthalpies of formation
of the crystalline compounds.
Af H,,(cr)/(kJ - mol~~l )
2-iodosobenzoic acid 2-(OI)C6H4COOH -336.9 2.5
4-nitrosophenol 4-(ON)C6H4OH -70.2 t 2. 1
An indirect method was used for assessing the dissociation enthalpy of the (1-0) bond
in the iodoso derivative, Dh\(I-O)/(kJ - io~~ 1) = (264.5 8. 1), which is the first value
reported for an iodine-oxygen bond in an organic molecule. p 1999 Academic Press
KEYWORDS: 2-iodosohenzoic acid; 4-nitrosophenol; dissociation enthalpy of the (1-0)
bond; enthalpy of combustion
"To whom correspondence should be addressed (E-mail: mdsilva@fe.up.pt).0021-9614/99/121551 + 09 $30.00/0
1999 Academic Press
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Silva, Maria D. M. C. Ribeiro da; Matos, M. Agostinha R.; Ferrão, Maria Luísa C. C. H.; Amaral, Luísa M. P. F.; Miranda, Margarida S.; Acree, William E. (William Eugene) et al. Enthalpies of combustion of 2-iodosobenzoic acid and 4-nitrosophenol: the dissociation enthalpy of the I-O bond, article, December 1, 1999; [Waltham, Massachusetts]. (https://digital.library.unt.edu/ark:/67531/metadc674030/m1/1/: accessed May 1, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT College of Arts and Sciences.