D], 9 [A], and [D], < [A], was shown to be reasonable.15 Very recently, however, it has been possible to obtain some values of K from n.m.r. measurements under the condition [D], = [A],.16 Some of these values differ by ca. 100% from those obtained from n.m.r. data on systems in which [D], > [A],.Although the first n.m.r. determinations of K using measurements from two non-equivalent nuclei yielded consistent results,17 Klinck and Stothers l8 reported that
In the current review paper the content of the journal Structural Chemistry for the calendar year 2008 is related to thermochemistry. Papers are summarized and a thermochemical slant added. Often questions are asked and research topics suggested.
In the current review, the content of the journal Structural Chemistry for the calendar year 2005 is related to thermochemistry. Papers are summarized and a thermochemical flavor added. Often questions are asked and research topics suggested.
The energies of combustion and fusion of 5-cyano-5H-dibenzo [a,d]cycloheptene (1) and (5E,11E)-dibenzo[a,e]cyclooctene-5,11-dicarbonitrile (2) were measured by means of microbomb calorimetry and DSC, respectively. The derived enthalpies of formation in solid state are 320 ± 18 for nitrile 1 and 470 ± 31 kJ mol -1 for nitrile 2, respectively. The experimental enthalpies of formation are discussed in relationship with values calculated at the G3(MP2)//B3LYP level of quantum chemical theory, by means of group additivity and isodesmic reactions. The two nitriles are not stabilized by dibenzoannelation.Keywords Dibenzocycloalkane nitrile Á Enthalpies of combustion and of formation Á Enthalpies of fusion, vaporization and sublimation Á G3(MP2)//B3LYP quantum chemical calculations Á Group additivity Á Isodesmic reactions
Excited states above the 17 + isomeric state in the proton-rich nucleus 152 Tm were established by employing the recoil-isomer tagging technique. Data were collected using the JUROGAM gamma-ray array and the GREAT spectrometer together with the recoil ion transport unit (RITU) gas-filled recoil separator and analyzed to identify the prompt and delayed γ decays from the levels in 152 Tm. Shell-model calculations, either in a large valence space or in a reduced model space with five protons in the π 0h 11/2 orbital and one neutron in the ν1f 7/2 orbital, agree with the observed energies of the yrast levels up to angular momentum J = 21. The observation of near degeneracies in the energy spectrum can be attributed to specific components of the proton-neutron interaction. The isomeric decay of the 17 + level is not reproduced in the shell-model calculations as it arises from a delicate balance between hindrance due to seniority selection rules and enhancement due to configuration mixing.
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