Determination of the Effective Charge Density of pH‐Responsive Keplerate Polyoxometalate Clusters by Means of Agarose Gel Electrophoresis1. Issue 10 (21st January 2013)

• Record Type: Journal Article
• Authors: Pigga, Joseph M.; Liu, Tianbo
• Other Names: Kortz Ulrich sponsoringEditor.; Liu Tianbo sponsoringEditor.
• Is Part Of: European journal of inorganic chemistry. Issue 10/11(2013)
• Page Start: 1854
• Page End: 1858
• Publication Date: 2013-01-21
• Subjects: Polyoxometalates -- Self‐assembly -- Electrophoresis -- Charge density -- Anions; Chemistry, Inorganic -- Periodicals; Organometallic chemistry -- Periodicals; Bioinorganic chemistry -- Periodicals; Solid state chemistry -- Periodicals; 546
• DOI: 10.1002/ejic.201201230
• Languages: English
• ISSNs: 1434-1948

Abstract

Abstract: The effective (net) charge densities of the Keplerate {Mo72 Fe30 }, {Mo72 V30 }, and {W72 Mo30 } macroanions in dilute aqueous solution were determined from electrophoresis measurements, which provided direct, quantitative evidence of the counterion association behavior around macroions. The latter two clusters are strong electrolytes, and their charge densities show no clear pH dependence. The surface charge density of {Mo72 Fe30 } increased with increasing solution pH owing to the partial deprotonation of the weak acid {Mo72 Fe30 } macroions. A close connection between the surface charge density of {Mo72 Fe30 } and their assembled blackberry structure sizes was observed. Abstract : The effective charge densities of Keplerate macroanions in dilute aqueous solutions were determined from gel electrophoresis measurements, which provided direct, quantitative evidence of the counterion association behavior around macroions. A close connection between the surface charge density of {Mo72 Fe30 } and their assembled blackberry structure sizes was observed.