The photoluminescence study of a series of platinum(II) α -diimine complexes revealed a dramatic decrease in steady-state phosphorescence intensity when the diimine ligand was substituted in the 2 and 9 positions. Therefore, the molecular structure of the complex Pt(2,9-dmp)(mes)2 (where mes = 2,4,6-trimethylphenyl, and 2,9-dmp = 2,9-dimethyl-1,10-phenanthroline) was determined by X-ray diffraction methods: monoclinic, space group P21/N, a = 7.9335(7), b = 21.952(3), c = 15.3103(3) Å, β = 93.4980(5), Z = 4, R = 0.070, R w = 0.045. The complex has significant distortions from the ideal square planar geometry which may be responsible for the lack of detectable phosphorescence as compared with those complexes lacking substituents in the 2 and 9 positions on the diimine ligand.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical Measurements in the Undergraduate CurriculumJohn F. Wheeler , Sandra K. Wheeler , and Laura L. Wright View Author Information Department of Chemistry, Furman University, Greenville, SC 29613Cite this: J. Chem. Educ. 1997, 74, 1, 72Publication Date (Web):January 1, 1997Publication History Received3 August 2009Published online1 January 1997Published inissue 1 January 1997https://pubs.acs.org/doi/10.1021/ed074p72https://doi.org/10.1021/ed074p72research-articleACS PublicationsRequest reuse permissionsArticle Views826Altmetric-Citations4LEARN 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 SUBJECTS:Computer simulations,Curriculum,Electrodes,High-performance liquid chromatography,Undergraduates Get e-Alerts

The electron distribution and orbital interactions of C60 with metals coordinated at different sites on the outside of the fullerene are evaluated with the Fenske-Hall molecular orbital method. The characters and nodal properties of the frontier orbitals of C60 are first evaluated in terms of basis transformations to the C2 units that join the pentagons and to the C5 units of the pentagons in the C60 molecule. The highest occupied molecular orbital (HOMO, hu symmetry) of C60 is largely π bonding between the carbon atom pairs that join adjacent pentagons. The lowest unoccupied molecular orbital (LUMO, t1u symmetry) is predominantly π antibonding between these carbon atom pairs. These orbital characters and energies are well situated for synergistic bonding of a metal atom to the carbon-carbon pair between the pentagons, in which the HOMO of C60 donates σ electron density to the metal, and the LUMO of C60 accepts π electron density from the metal. The electron donation and acceptance between the individual molecular orbitals of the C60 molecule and the orbitals of a metal at different possible bonding sites of C60 are probed with a Ag+ ion. It is found that the bonding is favored at the site between the pentagons and that many different orbitals of C60 are involved in the interaction. The net bonding of Ag+ to C60 is weaker than to ethylene. Calculations are also carried out on the organometallic complexes C60Pt(PH3)2 and (C2H4)Pt(PH3)2. The net bonding of ethylene and C60 to platinum is found to be very similar in these cases. A significant difference in this case is that the net negative charge on C60 is more delocalized in the carbon cluster in contrast to the localized charge on ethylene.

Abstract The electronic interactions of fullerene molecules with metals, with other molecules, and with themselves are important to the chemical and conductive properties of these materials. We demonstrate high resolution scanning tunneling microscopy images of C 60 molecules condensed on epitaxial gold (111) films on mica, in which the C 60 molecules are isolated from each other. The C 60 molecules were locked in position to the gold substrate by an ordered layer of methyl isobutyl ketone. The images of the C 60 molecules exhibit intramolecular contrast indicating a significant electronic interaction with the gold substrate. Current versus voltage measurements show that both the C 60 and the thin film of methyl isobutyl ketone have conductances comparable to that of the gold substrate.

AbstractThe reactivity of the thiocarbonyl functional group in (I) is studied.

The ability of the Streptozyme® test to identify significant antibody rises in 46 patients with streptococcal pharyngitis was comparable to, but no greater than, that of the antistreptolysin O or antideoxyribonuclease B test and inferior to that of the combined use of both the antistreptolysin O and antideoxyribonuclease B tests. Serum specimens were also simultaneously analyzed with three different lots of Streptozyme® reagent. Lot-to-lot variation in the reagent resulted in a significant difference in antibody titer for 18 (19%) of the 92 sera tested. Differences among the three lots also produced variation in determining whether a significant rise in titer had occurred from the acute phase to the convalescent phase serum for a given patient. These observations raise concerns about the standardization of the Streptozyme® reagent and document the need for precise identification and quantitation of the streptococcal antigens used in this product.

To determine the effectiveness of a short (five-day) course of penicillin V potassium therapy, 172 patients with group A beta-hemolytic streptococcal (GABHS) pharyngitis were randomly assigned to receive 250 mg of penicillin V potassium three times daily for either five or ten days. The patients in the two treatment groups were comparable with respect to clinical findings, compliance, and serologic response to GABHS. A bacteriologic treatment failure was defined as the presence of the same serotype of GABHS in the follow-up as in the initial throat culture and occurred in 13 (18%) of the 73 patients in the five-day treatment group and in six (6%) of the 99 patients in the ten-day treatment group. These findings support the current recommendation for a full ten days of oral penicillin V therapy for the treatment of GABHS pharyngitis.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIn-plane coordinated double bonds. Molecular structures, spectroscopy, and stability of 5-methylenecyclooctene and 5-methylenecycloheptene complexes of platinum(II)Margaret H. Rakowsky, John C. Woolcock, Laura L. Wright, David B. Green, Michael F. Rettig, and Richard M. WingCite this: Organometallics 1987, 6, 6, 1211–1218Publication Date (Print):June 1, 1987Publication History Published online1 May 2002Published inissue 1 June 1987https://doi.org/10.1021/om00149a015RIGHTS & PERMISSIONSArticle Views141Altmetric-Citations20LEARN 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 InReddit PDF (1 MB) Get e-AlertsSupporting Info (1)»Supporting Information Supporting Information Get e-Alerts

Molybdenum-Sulfur Cluster Chelates H. Keck, H. Keck Institut für Anorganische Chemie und Strukturchemie I, University of Düsseldorf, 4000 Düsseldorf, Federal Republic of Germany.Search for more papers by this authorW. Kuchen, W. Kuchen Institut für Anorganische Chemie und Strukturchemie I, University of Düsseldorf, 4000 Düsseldorf, Federal Republic of Germany.Search for more papers by this authorJ. Mathow, J. Mathow Institut für Anorganische Chemie und Strukturchemie I, University of Düsseldorf, 4000 Düsseldorf, Federal Republic of Germany.Search for more papers by this authorW. K. Miller, W. K. Miller Department of Chemistry, University of Colorado, Boulder, CO 80309.Search for more papers by this authorL. Tanner, L. Tanner Department of Chemistry, University of Colorado, Boulder, CO 80309.Search for more papers by this authorL. L. Wright, L. L. Wright Department of Chemistry, University of Colorado, Boulder, CO 80309.Search for more papers by this authorC. J. Casewit, C. J. Casewit Department of Chemistry, University of Colorado, Boulder, CO 80309.Search for more papers by this authorM. Rakowski Dubois, M. Rakowski Dubois Department of Chemistry, University of Colorado, Boulder, CO 80309.Search for more papers by this author H. Keck, H. Keck Institut für Anorganische Chemie und Strukturchemie I, University of Düsseldorf, 4000 Düsseldorf, Federal Republic of Germany.Search for more papers by this authorW. Kuchen, W. Kuchen Institut für Anorganische Chemie und Strukturchemie I, University of Düsseldorf, 4000 Düsseldorf, Federal Republic of Germany.Search for more papers by this authorJ. Mathow, J. Mathow Institut für Anorganische Chemie und Strukturchemie I, University of Düsseldorf, 4000 Düsseldorf, Federal Republic of Germany.Search for more papers by this authorW. K. Miller, W. K. Miller Department of Chemistry, University of Colorado, Boulder, CO 80309.Search for more papers by this authorL. Tanner, L. Tanner Department of Chemistry, University of Colorado, Boulder, CO 80309.Search for more papers by this authorL. L. Wright, L. L. Wright Department of Chemistry, University of Colorado, Boulder, CO 80309.Search for more papers by this authorC. J. Casewit, C. J. Casewit Department of Chemistry, University of Colorado, Boulder, CO 80309.Search for more papers by this authorM. Rakowski Dubois, M. Rakowski Dubois Department of Chemistry, University of Colorado, Boulder, CO 80309.Search for more papers by this author Book Editor(s):Stanley Kirschner, Stanley Kirschner Deportment of Chemistry Wayne State University Detroit, MichiganSearch for more papers by this author First published: 01 January 1985 https://doi.org/10.1002/9780470132548.ch23Citations: 3Book Series:Inorganic Syntheses AboutPDFPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShareShare a linkShare onEmailFacebookTwitterLinkedInRedditWechat Summary This chapter contains sections titled: Tris(Diethylphosphinodithioato)-Tris-μ-Disulfido-μ3-Thio-Triangulo-Trimolybdenum(IV)Diethylphosphinodithioate μ-Diethylposphinodithioato-Tris(Diethylphosphinodithioato)Tri-μ-Thio-μ3-Thio-Triangulo-Trimolybdenum(IV) References . E. I. Stiefel, Prog. Inorg. Chem., 22, 1 (1977). 10.1002/9780470166239.ch1 CASGoogle Scholar .(a) A. Müller, R. Jostes, and F. A. Cotton, Angew. Chem., 92, 921 (1980); 10.1002/ange.19800921107 CASGoogle Scholar(b) Angew. Chem. Int. (Engl. Ed.), 19, 875 (1980). 10.1002/anie.198008751 Web of Science®Google Scholar .(a) H. Keck, W. Kuchen, J. Mathow, B. Meyer, D. Mootz, and H. Wunderlich, Angew. Chem., 93, 1019 (1981); 10.1002/ange.19810931124 CASGoogle Scholar(b) Angew. Chem. Int. (Engl. Ed.), 20, 975 (1981). 10.1002/anie.198109751 Web of Science®Google Scholar .(a) H. Keck, W. Kuchen, J. Mathow, and H. Wunderlich, Angew. Chem., 94, 927 (1982); 10.1002/ange.19820941218 CASGoogle Scholar(b) Angew. Chem. Int. (Engl. Ed.), 21, 929 (1982). Google Scholar . W. Kuchen, K. Strolenberg, and J. Metten, Chem. Ber., 96, 1733 (1963). 10.1002/cber.19630960635 CASWeb of Science®Google Scholar Citing Literature Inorganic Syntheses, Volume 23 ReferencesRelatedInformation

Shriner, Harlan C. Jr. M.D.; Spodaccini, Linda J. R.N.; Wright, Laura L. B.S.; Deutsch, Larry M.D. Author Information

We examined the effect of antibiotic therapy on the clinical course of group A beta-hemolytic streptococcal (GABHS) pharyngitis in 260 children. After a throat culture had been obtained, each child was evaluated for the presence of predetermined signs and symptoms, and was then randomized in a double-blind manner to receive penicillin V, cefadroxil, or placebo. Of the 194 children with throat cultures positive for GABHS, 68 received penicillin V, 70 received cefadroxil, and 56 received placebo. Approximately 18 to 24 hours later, each patient returned for reevaluation. Significantly fewer children who had received either penicillin or cefadroxil had persistence of each of the three objective signs and each of the three subjective symptoms than did children who had received placebo. In addition, the evaluating physician, parents, and patients all believed that significantly fewer of the patients given antibiotic failed to demonstrate overall clinical improvement.

A comparison of the accuracy and practicality of two new latex agglutination tests for the rapid identification of group A beta-hemolytic streptococci directly from throat swabs was performed in a busy pediatric office. The Directigen Group A Strep Test kit had a sensitivity of 84%, specificity 99%, positive predictive value 99%, and negative predictive value 93% when compared with blood agar cultures. The Culturette Brand 10-Minute Group A Strep ID Kit had a sensitivity of 83%, a specificity 99%, positive predictive value 97%, and negative predictive value 93% when compared with blood agar cultures. When cultures with less than 10 colonies of group A beta-hemolytic streptococci per plate were not considered positive, both rapid tests had a sensitivity of 95%. The Culturette Brand test required considerably less time, equipment, supplies, and skill than the Directigen test. Only the Culturette Brand test appeared to be practical for routine use in a pediatrician's office. Further investigations of the accuracy of both of these rapid tests need to be performed before either is accepted as a substitute for the throat culture.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of inequivalently bridged cyclopentadienyl dimers of molybdenum and a comparison of their reactivities with unsaturated molecules and with hydrogenMaryanne McKenna, Laura L. Wright, Douglas J. Miller, Linnea Tanner, R. C. Haltiwanger, and M. Rakowski DuBoisCite this: J. Am. Chem. Soc. 1983, 105, 16, 5329–5337Publication Date (Print):August 1, 1983Publication History Published online1 May 2002Published inissue 1 August 1983https://pubs.acs.org/doi/10.1021/ja00354a024https://doi.org/10.1021/ja00354a024research-articleACS PublicationsRequest reuse permissionsArticle Views351Altmetric-Citations99LEARN 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

AbstractEinige der dimeren Cyclopentadienyl‐Mo‐Komplexe, die zwei unterschiedliche Dithiolat‐Brücken enthalten, nämlich (Ia), (III) und (V) werden wie aufgezeichnet dargestellt.