Literaturnachweis - Detailanzeige
| Autor/inn/en | Smith, Garon C.; Hossain, Md Mainul; Barry, Daniel D. |
|---|---|
| Titel | 3-D Topo Surface Visualization of Metal Ion Anti-Buffering: An Unexpected Behavior in Metal-Ligand Complexation Systems |
| Quelle | In: Journal of Chemical Education, 95 (2018) 12, S.2182-2190 (9 Seiten)Infoseite zur Zeitschrift
PDF als Volltext |
| Zusatzinformation | ORCID (Smith, Garon C.) |
| Sprache | englisch |
| Dokumenttyp | gedruckt; online; Zeitschriftenaufsatz |
| ISSN | 0021-9584 |
| DOI | 10.1021/acs.jchemed.8b00292 |
| Schlagwörter | Science Instruction; College Science; Chemistry; Computer Assisted Instruction; Educational Technology; Graduate Study; Undergraduate Study; Scientific Concepts; Metallurgy; Visualization |
| Abstract | Diluting a system with metal complexes can sometimes cause free metal ions to increase in concentration. This paper describes "metal ion anti-buffering", a situation in which free metal ion concentrations rapidly increase as system dilution drives dissociation. It only occurs under excess free ligand conditions when a solution is dominated by higher stoichiometry complexes. The Law of Mass Action is used to provide a mathematical justification for the phenomenon. A Cu[superscript 2+]- ethylenediamine mixture exhibits this phenomenon when excess free ethylenediamine (en) is present. For example, it occurs when diluting a solution containing a 4-fold excess of en over Cu[superscript 2+]. As this mixture is diluted by a factor of 5600, the modeled free Cu[superscript 2+] concentration shows a 470-fold increase. Taken together, this is 2.5 million times higher than dilution of the system would yield in other circumstances. Included are experimental data confirming anti-buffering in the Cu[superscript 2+]-en system. Many other metal-ligand systems can display this behavior. Four additional examples are illustrated, including an amino acid under physiological pH. Anti-buffering TOPOS, a free downloadable Excel workbook, allows readers to simulate this behavior for many metal-ligand systems. A PowerPoint lecture and teaching materials are also provided, suitable for inclusion in upper division and graduate courses in analytical chemistry, biochemistry, and geochemistry. (As Provided). |
| Anmerkungen | Division of Chemical Education, Inc. and ACS Publications Division of the American Chemical Society. 1155 Sixteenth Street NW, Washington, DC 20036. Tel: 800-227-5558; Tel: 202-872-4600; e-mail: eic@jce.acs.org; Web site: http://pubs.acs.org/jchemeduc |
| Erfasst von | ERIC (Education Resources Information Center), Washington, DC |
| Update | 2020/1/01 |
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