Hexaniobate Cluster Anion Monolayers on Gold Nanoparticles: A New Structural Role for Alkali Metal Countercations

Shelly Sharet Leiser; Libi Polin; Gal Gan-Or; Manoj Raula; Ira A. Weinstock

doi:10.1021/acs.inorgchem.8b03139

Hexaniobate Cluster Anion Monolayers on Gold Nanoparticles: A New Structural Role for Alkali Metal Countercations

Shelly Sharet Leiser, Libi Polin, Gal Gan-Or, Manoj Raula, Ira A. Weinstock

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

Monolayer shells of polyoxotungstate cluster anions on gold nanoparticles in water were electrostatically stabilized by structurally integrated countercations, with formation constants, K, increasing in the order: Li ⁺ < Na ⁺ < K ⁺ < TMA ⁺ < Cs ⁺ (TMA ⁺ = tetramethylammonium). We now report that for hexaniobate cluster anions, K values increase in the same order, with the notable exception of TMA ⁺ , which is effectively unable to induce monolayer formation. These findings point to a new structural model in which hexaniobate anions form a spherical coordination polymer at the gold surface with alkali metal countercations serving as single-atom structural building units between hexaniobate linkers.

Original language	English
Pages (from-to)	1012-1015
Number of pages	4
Journal	Inorganic Chemistry
Volume	58
Issue number	2
DOIs	https://doi.org/10.1021/acs.inorgchem.8b03139
State	Published - 22 Jan 2019

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Inorganic Chemistry

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10.1021/acs.inorgchem.8b03139

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title = "Hexaniobate Cluster Anion Monolayers on Gold Nanoparticles: A New Structural Role for Alkali Metal Countercations",

abstract = " Monolayer shells of polyoxotungstate cluster anions on gold nanoparticles in water were electrostatically stabilized by structurally integrated countercations, with formation constants, K, increasing in the order: Li + < Na + < K + < TMA + < Cs + (TMA + = tetramethylammonium). We now report that for hexaniobate cluster anions, K values increase in the same order, with the notable exception of TMA + , which is effectively unable to induce monolayer formation. These findings point to a new structural model in which hexaniobate anions form a spherical coordination polymer at the gold surface with alkali metal countercations serving as single-atom structural building units between hexaniobate linkers.",

author = "Leiser, {Shelly Sharet} and Libi Polin and Gal Gan-Or and Manoj Raula and Weinstock, {Ira A.}",

note = "Funding Information: I.A.W. thanks the ISF (170/17) for financial support and CBMM Europe B.V. for a gift of hydrated niobium oxide. Publisher Copyright: {\textcopyright} 2019 American Chemical Society.",

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doi = "10.1021/acs.inorgchem.8b03139",

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T1 - Hexaniobate Cluster Anion Monolayers on Gold Nanoparticles

T2 - A New Structural Role for Alkali Metal Countercations

AU - Leiser, Shelly Sharet

AU - Polin, Libi

AU - Gan-Or, Gal

AU - Raula, Manoj

AU - Weinstock, Ira A.

PY - 2019/1/22

Y1 - 2019/1/22

N2 - Monolayer shells of polyoxotungstate cluster anions on gold nanoparticles in water were electrostatically stabilized by structurally integrated countercations, with formation constants, K, increasing in the order: Li + < Na + < K + < TMA + < Cs + (TMA + = tetramethylammonium). We now report that for hexaniobate cluster anions, K values increase in the same order, with the notable exception of TMA + , which is effectively unable to induce monolayer formation. These findings point to a new structural model in which hexaniobate anions form a spherical coordination polymer at the gold surface with alkali metal countercations serving as single-atom structural building units between hexaniobate linkers.

AB - Monolayer shells of polyoxotungstate cluster anions on gold nanoparticles in water were electrostatically stabilized by structurally integrated countercations, with formation constants, K, increasing in the order: Li + < Na + < K + < TMA + < Cs + (TMA + = tetramethylammonium). We now report that for hexaniobate cluster anions, K values increase in the same order, with the notable exception of TMA + , which is effectively unable to induce monolayer formation. These findings point to a new structural model in which hexaniobate anions form a spherical coordination polymer at the gold surface with alkali metal countercations serving as single-atom structural building units between hexaniobate linkers.

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Hexaniobate Cluster Anion Monolayers on Gold Nanoparticles: A New Structural Role for Alkali Metal Countercations

Abstract

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