Crystallization of organically templated phosphomolybdate cluster-based solids from aqueous solution

Journal of Chemical Sciences

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 𝑒𝑛 (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 (𝑒𝑛) 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