title: Keplerate cluster (Mo-132) mediated electrostatic assembly of nanoparticles.
abstract: The electrostatic assembly between a series of differently charged Mo-132-type Keplerates present in the compounds (NH4)42[{(Mo(VI))Mo(VI)5O21(H2O)6}12 {Mo(V)2O4(CH3COO)}30].ca. {300 H2O+10 CH3COONH4} (Mo-132a), (NH4)72-n[{(H2O)81-n+(NH4)n} {(Mo(VI))Mo(VI)5O21(H2O)6}12 {Mo(V)2O4(SO4)}30].ca. 200 H2O (Mo-132b), and Na10(NH4)62[{(Mo(VI))Mo(VI)5O21(H2O)6}12 {Mo(V)2O4(HPO4)}30]. ca. {300H2O+2Na(+)+2NH4(+)+4H2PO4(-)} (Mo-132c) with cationic gold nanoparticles (AuNPs) was investigated for the first time. The rapid electrostatic assembly from nanoscopic entities to micron scale aggregates was observed upon precipitation, which closely matched the point of aggregate electroneutrality. Successful assembly was demonstrated using UV-vis, DLS, TEM, and zeta-potential analysis. Results indicate that the point at which precipitation occurs is related to charge balance or electroneutrality, and that counterions at both the Mo-132 and AuNP play a significant role in assembly.
authors.affiliation: Department of Chemistry, Syracuse University, Syracuse, NY 13244, United States.
authors.forename: Jonathan
authors.initials: J
authors.lastname: Gooch
authors.affiliation: Department of Chemistry, Syracuse University, Syracuse, NY 13244, United States.
authors.forename: Abhishek A
authors.initials: AA
authors.lastname: Jalan
authors.affiliation: Department of Chemistry, Syracuse University, Syracuse, NY 13244, United States.
authors.forename: Stephanie
authors.initials: S
authors.lastname: Jones
authors.affiliation: Department of Chemistry, Syracuse University, Syracuse, NY 13244, United States.
authors.forename: Corey R
authors.initials: CR
authors.lastname: Hine
authors.affiliation: Department of Chemistry, Syracuse University, Syracuse, NY 13244, United States.
authors.forename: Rabeka
authors.initials: R
authors.lastname: Alam
authors.affiliation: Fakultät für Chemie der Universität, Postfach 100131, D-33501 Bielefeld, Germany.
authors.forename: Somenath
authors.initials: S
authors.lastname: Garai
authors.affiliation: Department of Chemistry, Syracuse University, Syracuse, NY 13244, United States. Electronic address: mmmaye@syr.edu.
authors.forename: Mathew M
authors.initials: MM
authors.lastname: Maye
authors.affiliation: Fakultät für Chemie der Universität, Postfach 100131, D-33501 Bielefeld, Germany.
authors.forename: Achim
authors.initials: A
authors.lastname: Müller
authors.affiliation: Department of Chemistry, Syracuse University, Syracuse, NY 13244, United States. Electronic address: jazubiet@syr.edu.
authors.forename: Jon
authors.initials: J
authors.lastname: Zubieta
keywords: Au nanoparticles; Electrostatic assembly; Keplerate clusters; Micron scale aggregation; Zeta-potential analysis