Showing: 8 from total: 2588 publications
2581. ENTHALPIES OF COMBUSTION OF 1,2-DIHYDROXYBENZENE AND OF 6-ALKYLSUBSTITUTED 1,2-DIHYDROXYBENZENES
DASILVA, MDMCR ; DASILVA, MAVR ; PILCHER, G
in JOURNAL OF CHEMICAL THERMODYNAMICS, 1984, ISSN: 0021-9614,  Volume: 16, 
Article,  Indexed in: crossref, scopus, wos 
DOI: 10.1016/0021-9614(84)90187-3 P-001-WX6
Abstract The standard (p<sup>o</sup> = 101.325 kPa) molar enthalpies of combustion in oxygen at 298.15 K were measured by static-bomb calorimetry and the standard molar enthalpies of sublimation at 298.15 K were measured by microcalorimetry for 1,2-dihydroxybenzene (catechol) and six alkylsubstituted catechols: {A table is presented}. The increment in the molar enthalpy of formation of the gaseous compound for substitution of alkyl-groups into catechol was found to be approximately the same as the corresponding increment for substitution into benzene. © 1984.
2582. CERTIFICATION OF BDH THERMOCHEMICAL STANDARD BENZOIC-ACID
PILCHER, G ; BICKERTON, J ; DASILVA, MMDCCR
in JOURNAL OF CHEMICAL THERMODYNAMICS, 1984, ISSN: 0021-9614,  Volume: 16, 
Note,  Indexed in: crossref, scopus, wos 
DOI: 10.1016/0021-9614(84)90180-0 P-007-MS4
2583. Standard enthalpies of formation of bis(pentane-2,4-dionato)Cu(II) and of four bis(methyl-substituted heptane-3,5-dionato)Cu(II) complexes: the mean (CuO) bond-dissociation enthalpies
Ribeiro Da Silva, MA ; Ribeiro Da Silva, MD ; Carvalho, AP ; Akello, MJ ; Pilcher, G
in The Journal of Chemical Thermodynamics, 1984, ISSN: 0021-9614,  Volume: 16, 
Article,  Indexed in: crossref 
DOI: 10.1016/0021-9614(84)90146-0 P-00H-5X2
2584. ON THE MEASUREMENT OF THE IMPEDANCE OF ITIES - THE NITROBENZENE WATER AND 1,2-DICHLOROETHANE WATER INTERFACES
SILVA, F ; MOURA, C
in JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1984, ISSN: 1572-6657,  Volume: 177, 
Note,  Indexed in: scopus, wos 
DOI: 10.1016/0022-0728(84)80234-x P-001-WXB
2585. On the measurement of the impedance of ities
Silva, F ; Moura, C
in Journal of Electroanalytical Chemistry and Interfacial Electrochemistry, 1984, ISSN: 0022-0728,  Volume: 177, 
Article,  Indexed in: crossref 
DOI: 10.1016/0022-0728(84)80234-x P-00J-BXY
2586. IS GOLD LESS HYDROPHILIC THAN MERCURY?
Silva, F ; Hamelin, A ; Parsons, R
in Extended Abstracts, Meeting - International Society of Electrochemistry, 1983,
Proceedings Paper,  Indexed in: scopus 
P-007-446
2587. Phase transformations in adsorbed layers of thiourea and halide ions on mercury
Hills, G ; Silva, F
in Journal of Electroanalytical Chemistry, 1982, ISSN: 0022-0728,  Volume: 137, 
Article,  Indexed in: scopus 
P-007-G5J
2588. ENTHALPIES OF FORMATION OF HEXAKIS(ISOPROPOXY)-DIMOLYBDENUM AND OCTAKIS-(ISOPROPOXY)-DIMOLYBDENUM AND THE METAL-METAL BOND ENTHALPY CONTRIBUTIONS
CAVELL, KJ ; CONNOR, JA ; PILCHER, G ; DASILVA, MAVR ; DASILVA, MDMC ; SKINNER, HA ; VIRMANI, Y ; ZAFARANIMOATTAR, MT
in JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS I, 1981, ISSN: 0300-9599,  Volume: 77, 
Article,  Indexed in: crossref, scopus, wos 
DOI: 10.1039/f19817701585 P-008-KFP
Abstract Standard enthalpies of formation of crystalline samples at 298.15 K were determined by solution calorimetry (oxidative hydrolysis), for ΔH<inf>f</inf><sup>⊖</sup>[Mo<inf>2</inf>(OPr<sup>i</sup>) <inf>6</inf>, c] = -(1661.8±9) kJ mol<sup>-1</sup> and ΔH<inf>f</inf><sup>⊖</sup>[Mo<inf>2</inf>(OPr<sup>i</sup>) <inf>8</inf>, c] = -(2292.5±10) kJ mol<sup>-1</sup>. The dissociation process [Mo<inf>2</inf>(OPr<sup>i</sup>)<inf>8</inf>, g] → 2 Mo(OPr<sup>i</sup>)<inf>4</inf>, g is calculated to be endothermic, ΔH ≈ 184 kJ mol<sup>-1</sup>. A bond-enthalpy/bond-length curve is tentatively proposed for Mo-Mo bonds. A similar curve for Mo-O bonds is given, to fit the limited thermochemical data available. It is concluded that the Mo=Mo bond in Mo<inf>2</inf>(OPr<sup>i</sup>)<inf>8</inf> contributes ca. 200-230 kJ mol<sup>-1</sup> to the binding in this molecule.