%0 Journal Article %1 Lytken2008a %A Lytken, O %A Lew, W %A Harris, JJW %A Vestergaard, EK %A Gottfried, JM %A Campbell, CT %D 2008 %J J. Am. Chem. Soc. %K microcalorimetry science, surface %N 31 %P 10247--10257 %R 10.1021/ja801856s %T Energetics of cyclohexene adsorption and reaction on Pt(111) by low-temperature microcalorimetry %U http://dx.doi.org/10.1021/ja801856s %V 130 %X The heat of adsorption and sticking probability of cyclohexene on Pt(111) were measured as a function of coverage using single-crystal adsorption calorimetry in the temperature range from 100 to 300 K. At 100 K, cyclohexene adsorbs as intact di-sigma bonded cyclohexene on Pt(l 11), and the heat of adsorption is well described by a second-order polynomial (130 - 47 theta - 1250 theta(2)) kJ/mol, yielding a standard enthalpy of formation of di-sigma bonded cyclohexene on Pt(111) at low coverages of -135 kJ/mol and a C-Pt sigma bond strength of 205 kJ/mol. At 281 K, cyclohexene dehydrogenates upon adsorption, forming adsorbed 2-cyclohexenyl (c-C6H9,a) and adsorbed hydrogen, and the heat of adsorption is well described by another second-order polynomial (174 - 700 theta + 761 theta(2)) kJ/mol. This yields a standard enthalpy of formation of adsorbed 2-cyclohexenyl on Pt(111) at a low coverage of -143 kJ/mol. At coverages below 0.10 ML, the sticking probability of cyclohexene on Pt(111) is close to unity (\textgreater 0.95), independent of temperature.

@article{Lytken2008a, abstract = {The heat of adsorption and sticking probability of cyclohexene on Pt(111) were measured as a function of coverage using single-crystal adsorption calorimetry in the temperature range from 100 to 300 K. At 100 K, cyclohexene adsorbs as intact di-sigma bonded cyclohexene on Pt(l 11), and the heat of adsorption is well described by a second-order polynomial (130 - 47 theta - 1250 theta(2)) {kJ/mol,} yielding a standard enthalpy of formation of di-sigma bonded cyclohexene on Pt(111) at low coverages of -135 {kJ/mol} and a {C-Pt} sigma bond strength of 205 {kJ/mol.} At 281 K, cyclohexene dehydrogenates upon adsorption, forming adsorbed 2-cyclohexenyl {(c-C6H9,a)} and adsorbed hydrogen, and the heat of adsorption is well described by another second-order polynomial (174 - 700 theta + 761 theta(2)) {kJ/mol.} This yields a standard enthalpy of formation of adsorbed 2-cyclohexenyl on Pt(111) at a low coverage of -143 {kJ/mol.} At coverages below 0.10 {ML,} the sticking probability of cyclohexene on Pt(111) is close to unity ({\textgreater} 0.95), independent of temperature.}, added-at = {2009-10-30T10:04:05.000+0100}, author = {Lytken, O and Lew, W and Harris, {JJW} and Vestergaard, {EK} and Gottfried, {JM} and Campbell, {CT}}, biburl = {https://www.bibsonomy.org/bibtex/2be69f94df384e545d0861869b41ff072/jfischer}, doi = {10.1021/ja801856s}, groups = {public}, interhash = {eb10eccfccb0771aaf76dd3c259eccf1}, intrahash = {be69f94df384e545d0861869b41ff072}, issn = {0002-7863}, journal = {J. Am. Chem. Soc.}, keywords = {microcalorimetry science, surface}, month = {August}, number = 31, pages = {10247--10257}, timestamp = {2009-10-30T10:04:16.000+0100}, title = {Energetics of cyclohexene adsorption and reaction on Pt(111) by low-temperature microcalorimetry}, url = {http://dx.doi.org/10.1021/ja801856s}, volume = 130, year = 2008 }