Journal of Chemical Sciences | |
Crystallization of organically templated phosphomolybdate cluster-based solids from aqueous solution | |
Minakshi Asnani1  Arunachalam Ramanan11  Dinesh Kumar1  T Duraisamy1  | |
[1] Department of Chemistry, Indian Institute of Technology Delhi, New Delhi 110016, India$$ | |
关键词: Phosphomolybdate cluster; supramolecular interaction; hydrothermal synthesis.; | |
DOI : | |
来源: Indian Academy of Sciences | |
【 摘 要 】
The paper reports the synthesis and structural characterization of several organic-inorganic solids involving phosphomolybdate clusters. The Strandberg-type {P2Mo$^{ext{VI}}_{5}$O23} and the lower-valent {P4Mo$^{V}_{6$O31} cluster based solids were isolated in the presence of ð‘’ð‘› (ethylenediamine) by controlling pH of the reaction medium. The lower-valent cluster invariably requires the presence of a suitable metal cation for further stabilization. A detailed investigation of the system was carried out where three different weak acids viz. oxalic acid, succinic acid and glycine were used in the entire pH range (1-12). Our results establish that the organic amine (ð‘’ð‘›) is alone capable of reducing the molybdenum core in the absence of an organic acid at a suitable pH. Hence, pH of the reaction medium combined with suitable temperature favours the formation of lower-valent phosphomolybdate cluster. Higher pH favours the precipitation of a new sodium hydrogen phosphate.
【 授权许可】
Unknown
【 预 览 】
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