ColorantsPub Date : 2021-12-22DOI: 10.3390/colorants1010003
S. Shapovalov
{"title":"Cation–Anionic Interactions of Dyes in Aqueous Solutions: Bromocresol Purple in the Processes of Dissimilar Association","authors":"S. Shapovalov","doi":"10.3390/colorants1010003","DOIUrl":"https://doi.org/10.3390/colorants1010003","url":null,"abstract":"The interaction between single- or double-charged anions of bromocresol purple (BP) and cyanine cations (quinaldine blue, QB, or quinaldine red, QR) at concentrations of dyes 5.0·10−7–4.0·10−5 mol/L has been investigated by vis-spectroscopy. The thermodynamic constants of dissimilar associations (Kas) have been studied. Comparison of the values of lg Kas shows that QB− associates of BP− are more stable (6.61 ± 0.07) than QR associates (4.84 ± 0.06); a similar phenomenon is observed for associates of the BP2− anion. Semi-empirical calculations (PM3 method) are in agreement with the vis-spectroscopy data and indicate that the association of dye into an associate is possible. The standard enthalpies of formation of associates (ΔfHo) and energy diagrams have been determined. The ΔfHo data indicate that the formation of an associate between dye ions is an energetically favourable process. The gain in energy significantly exceeds the systematic error of semi-empirical calculations and increases from 157 kJ/mol (associate ”BP− + QB+”) to 729 kJ/mol (associate “BP2− + QR+”). The most probable structures of dissimilar associates are presented. The study of the dissimilar association develops the concept of intermolecular interactions in solutions.","PeriodicalId":10539,"journal":{"name":"Colorants","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86467026","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ColorantsPub Date : 2021-09-17DOI: 10.3390/colorants1010002
Shu-Kun Lin
{"title":"Publisher’s Note to Launch Colorants—A Scientific Journal of Dyes, Pigments and Color Chemistry","authors":"Shu-Kun Lin","doi":"10.3390/colorants1010002","DOIUrl":"https://doi.org/10.3390/colorants1010002","url":null,"abstract":"On 11 May 2010, the code ISSN 2079-6447 was obtained for Colorants following an application to the ISSN Center in Paris [...]","PeriodicalId":10539,"journal":{"name":"Colorants","volume":"114 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78084539","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ColorantsPub Date : 2021-09-14DOI: 10.3390/colorants1010001
Anthony Harriman
{"title":"Colorants: A New Journal Bringing Colour to Life","authors":"Anthony Harriman","doi":"10.3390/colorants1010001","DOIUrl":"https://doi.org/10.3390/colorants1010001","url":null,"abstract":"Colorant: A substance which is used to impart colour to another material! [...]","PeriodicalId":10539,"journal":{"name":"Colorants","volume":"81 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83965106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}