ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAromatic disulfides in the detection of thiolsThaddeus J. Novak, Stephen G. Pleva, and Joseph. EpsteinCite this: Anal. Chem. 1980, 52, 12, 1851–1855Publication Date (Print):October 1, 1980Publication History Published online1 May 2002Published inissue 1 October 1980https://pubs.acs.org/doi/10.1021/ac50062a018https://doi.org/10.1021/ac50062a018research-articleACS PublicationsRequest reuse permissionsArticle Views185Altmetric-Citations5LEARN 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

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDecomposition at 90.degree.C of the cholinesterase substrate indoxyl acetate impregnated on paper supportsThaddeus J. Novak, Lester W. Daasch, and Joseph. EpsteinCite this: Anal. Chem. 1979, 51, 8, 1271–1275Publication Date (Print):July 1, 1979Publication History Published online1 May 2002Published inissue 1 July 1979https://pubs.acs.org/doi/10.1021/ac50044a037https://doi.org/10.1021/ac50044a037research-articleACS PublicationsRequest reuse permissionsArticle Views120Altmetric-Citations18LEARN 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

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of dyes derived from diindolylpyridylmethanesThaddeus J. Novak, David N. Kramer, Harold Klapper, Lester W. Daasch, and Brown L. Murr Jr.Cite this: J. Org. Chem. 1976, 41, 5, 870–875Publication Date (Print):March 1, 1976Publication History Published online1 May 2002Published inissue 1 March 1976https://pubs.acs.org/doi/10.1021/jo00867a025https://doi.org/10.1021/jo00867a025research-articleACS PublicationsRequest reuse permissionsArticle Views196Altmetric-Citations29LEARN 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

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganophosphorus esters as donors and solvents in studies of charge-transfer phenomena involving iodine and iodideThaddeus J. Novak, Edward J. Poziomek, William A. Mosher, and Raymond A. MackayCite this: J. Phys. Chem. 1976, 80, 23, 2609–2614Publication Date (Print):November 1, 1976Publication History Published online1 May 2002Published inissue 1 November 1976https://pubs.acs.org/doi/10.1021/j100564a016https://doi.org/10.1021/j100564a016research-articleACS PublicationsRequest reuse permissionsArticle Views106Altmetric-Citations3LEARN 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 options Get e-Alerts

AbstractAus dem Diindolyl‐pyridyl‐methan (I) entsteht bei der Alkylierung über das Salz (II) mit Basen ein Farbstoff (III)‐(IV).

Charge-transfer (CT) absorption spectra from CH2C12 solutions and Nujol mulls of a variety of pyridinium iodides have been compared. Factors such as hand grindings vs. mechanical milling, milling time, and support medium were examined with respect to effects on the position of the absorption bands in the solid state. Generally, the position of the low energy CT band appeared at lower wavelengths in mulls between CaF2 plates than in CH2Cl2 solutions. However, it was interesting to discover that the same mulls on filter paper or glass microfiber paper exhibit the CT band at energies higher than those found between CaF2 plates or in CH2Cl2 solution. As might be expected, small changes in structure such as differences in alkyl chain length influence the CT band position significantly more in the solid state than in solution.

Transparency characteristics are reported for cholesteryl myristate, decanoate, and nonanoate from the solid to the isotropic liquid phases. The procedure involves heating a sample between calcium fluoride plates in a brass holder in a Cary 14 spectrophotometer. Changes in transmittance at fixed wavelengths (3000, 4000, 5000, 7000, and 25,000 A) were recorded continuously as the temperature was allowed to change slowly. The transparency characteristics of cholesteryl nonanoate while being cooled from the liquid phase are also described. All transitions which occur are observed. By comparison with other techniques this method compares very favorably with regard to the detection of transitions and dichroic scattering. The shapes of the transparency curves vary markedly between compounds; the degree of light scattering varies as a function of the incident light wavelength. However, the temperature ranges over which the transitions occur for a particular compound are reproducible irrespective of the light wavelength.

A simple technique has been developed to measure the transparency of materials at any specific wavelength (ultraviolet to near infrared) vs temperature. The procedure involves heating a sample between calcium fluoride plates in a brass holder placed in a Cary 14 spectrophotometer. Changes in transmittance at a fixed wavelength are recorded continuously as the temperature is allowed to change slowly. As an illustration of the procedure the transmission properties of the nematic liquid crystal, butyl p-(p-ethoxyphenoxycarbonyl)-phenyl carbonate, in its various states are described. For comparison purposes a description of the transmittance of phenyl benzoate (which does not possess a mesophase) is also included.