ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoadsorption of ferrocene-terminated and unsubstituted alkanethiols on gold: electroactive self-assembled monolayersChristopher E. D. Chidsey, Carolyn R. Bertozzi, T. M. Putvinski, and A. M. MujsceCite this: J. Am. Chem. Soc. 1990, 112, 11, 4301–4306Publication Date (Print):May 1, 1990Publication History Published online1 May 2002Published inissue 1 May 1990https://pubs.acs.org/doi/10.1021/ja00167a028https://doi.org/10.1021/ja00167a028research-articleACS PublicationsRequest reuse permissionsArticle Views5344Altmetric-Citations961LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-AlertscloseSupporting Info (1)»Supporting Information Supporting Information Get e-Alerts
Measurements of the superconducting ${\mathit{T}}_{\mathit{c}}$ and Raman spectra in isotopically modified ${\mathrm{Rb}}_{3}$${\mathrm{C}}_{60}$ are reported. A decrease in ${\mathit{T}}_{\mathit{c}}$ of 0.65\ifmmode\pm\else\textpm\fi{}0.10 K in samples with (75\ifmmode\pm\else\textpm\fi{}5)% substitution of $^{13}\mathrm{C}$ for $^{12}\mathrm{C}$ yields an exponent of \ensuremath{\alpha}=0.37\ifmmode\pm\else\textpm\fi{}0.05. This interpreted as evidence for phonon-mediated pairing.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew copper chemistry. 18. Reaction of Bu2CuLi.cntdot.LiI with alkyl iodides: evidence for free radicals and electron transferSteven H. Bertz, G. Dabbagh, and A. M. MujsceCite this: J. Am. Chem. Soc. 1991, 113, 2, 631–636Publication Date (Print):January 1, 1991Publication History Published online1 May 2002Published inissue 1 January 1991https://pubs.acs.org/doi/10.1021/ja00002a035https://doi.org/10.1021/ja00002a035research-articleACS PublicationsRequest reuse permissionsArticle Views371Altmetric-Citations32LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts
Cationic silicon clusters, Si+1–7, were observed to react bimolecularly and exothermically with xenon difluoride in the ion trap of a Fourier transform mass spectrometer. Three ionic products are observed from Si+n: SiF+, Si+n−1, and SinF+. Subsequent reactions of these products with xenon difluoride were determined as well. SinF+, n=2–6, react with xenon difluoride to form two ionic products: SiF+ and Si+n−1. SiF+m, m=1–3, react with xenon difluoride to form SiF+m+1 and XeF+. All observed products correspond to mono- or difluorination of the clusters by xenon difluoride; in many cases the reaction was sufficiently exothermic that the fluorinated cluster fragmented immediately to produce either Si+n−1 or SiF+. Based upon the observed trends in the product distributions, the extent of mono- vs difluorination of the clusters was obtained. The amount of monofluorination varies from 100% for SiF+m, m=0–3, to 0% for Si+7. By extrapolation, xenon difluoride should difluorinate bulk silicon exclusively. The reaction rates for the bare clusters differ only slightly among themselves. The monofluorinated silicon clusters, in contrast, have significant variations in reaction rate as a group. Substantially lower reaction rates are observed for Si4F+ and Si6F+; this is believed to derive from the greater thermodynamic stabilities of Si+4 and Si+6.
Crystals of ${\mathrm{C}}_{60}$ or ${\mathrm{C}}_{70}$ cocrystallized with n-pentane grow as elongated, ten-sided columns. X-ray diffraction shows ordering of ${\mathrm{C}}_{60}$ or ${\mathrm{C}}_{70}$ molecules along the column and a remarkable tenfold symmetry normal to the column. The ratio of the x-ray-diffraction vectors of the two lowest-order diffraction spots is nearly equal to the ``golden ratio,'' \ensuremath{\tau}. Despite these similarities with decagonal, quasicrystalline order, the diffraction indicates crystalline order with a twinned unit cell.
ADVERTISEMENT RETURN TO ISSUEPREVArticlePerchloro-7H-cycloprop[a]acenaphthylene and the perchlorophenalenyl systemR. C. Haddon, S.V. Chichester, S. M. Stein, J. H. Marshall, and A. M. MujsceCite this: J. Org. Chem. 1987, 52, 4, 711–712Publication Date (Print):February 1, 1987Publication History Published online1 May 2002Published inissue 1 February 1987https://pubs.acs.org/doi/10.1021/jo00380a052https://doi.org/10.1021/jo00380a052research-articleACS PublicationsRequest reuse permissionsArticle Views218Altmetric-Citations41LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts
Abstract The thermal decomposition of complexes between poly(2‐vinylpyridine) (P2VPy) and copper chloride was investigated by several techniques, including thermogravimetric analysis and mass spectrometry. P2VPy was selected as the host polymer for two reasons: its ability to form complexes with copper compounds which are soluble in high concentrations, and because it forms essentially no char upon pyrolysis. The decomposition mechanism of P2VPy changes significantly upon complexation with copper compounds. P2VPy was initially thought to be an ideal ligand for the pyrolytic formation of pure copper owing to its low carbon yield upon thermal decomposition. The presence of copper chloride during polymer decomposition alters the decomposition mechanism of the polymer and accounts for significant yields of carbonaceous char. The magnitude of this effect is dependent upon the quantity of copper present. Polymer char yields as high as 41 wt% have been obtained when each pyridine moiety is complexed by CuCl 2 . Studies based on the model compound Cu(2‐picoline) 2 Cl 2 indicate that the diffusion length of released volatiles plays a significant role in the observed decomposition mechanisms.
A particle analyser is described that simultaneously detects and characterizes <0.02 to >10 mu m diameter particles independent of particle composition in real time. No previous instrument has been able to perform these functions simultaneously. Our design uses pulsed laser ablation of particles followed by time-of-flight mass spectrometric analysis of the resulting ions. The ion intensity is related to particle size at least for small particles. Thus particle size information is obtained concurrently with the other information.
