Preparation and application of L-cysteine-doped Keggin polyoxometalate microtubes

Journal Article · Sun Jan 15 00:00:00 EST 2012 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2011.10.048· OSTI ID:21612876

Yan, Shen ^[1]; Huanqiu, Zhang; Cuili, Meng; Fang, Zhang ^[1]

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1. Key Laboratory of Polyoxometalate Science of the Ministry of Education, Faculty of Chemistry, Northeast Normal University, Changchun, Jilin 130024 (China)

L-cysteine-doped tungstosilicate (Lcys-SiW{sub 12}) microtubes are prepared, and the amount of L-cysteine doped in the microtubes can be tuned to some extent. The as-prepared Lcys-SiW{sub 12} microtubes are sensitive to ammonia gas exhibited through the distinct color change of the microtubes from light purple to dark blue after exposing to ammonia gas. A possible mechanism of the coloration is that the adsorbed ammonia molecules increase the basicity of the Lcys-SiW{sub 12} microtubes and promote the redox reaction between L-cysteine and polyoxometalate. This is a pH-dependent solid-solid redox reaction, which is triggered by proton capture agent. The Lcys-SiW{sub 12} microtubes show application in chemical sensors for alkaline gases. - Graphical abstract: The Lcys-SiW{sub 12} microtubes were formed during transformation of the monolacunary Keggin-type [{alpha}-SiW{sub 11}O{sub 39}]{sup 8-} to the saturated Keggin-type [{alpha}-SiW{sub 12}O{sub 40}]{sup 4-}, meanwhile L-cysteine molecules were doped during the growth of the microtubes. Highlights: Black-Right-Pointing-Pointer L-cysteine-doped polyoxometalate microtubes are prepared. Black-Right-Pointing-Pointer Amount of L-cysteine doped in the microtubes can be tuned to some extent. Black-Right-Pointing-Pointer Lcys-SiW{sub 12} microtubes can be applied as a sensor for detecting alkaline gases. Black-Right-Pointing-Pointer This is a proton capture agent-triggered solid-solid redox reaction.

• OSTI ID: 21612876
• Journal Information: Journal of Solid State Chemistry, Vol. 185; Other Information: DOI: 10.1016/j.jssc.2011.10.048; PII: S0022-4596(11)00590-1; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AMMONIA
CYSTEINE
DOPED MATERIALS
GASES
PROTONS
REDOX REACTIONS
SENSORS
SOLIDS
AMINO ACIDS
BARYONS
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
ELEMENTARY PARTICLES
FERMIONS
FLUIDS
HADRONS
HYDRIDES
HYDROGEN COMPOUNDS
MATERIALS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NUCLEONS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
THIOLS