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Hydrothermal Synthesis of Transition Metal Molybdates: Chemistry Issues

Speaker: A. Ramanan, Chemistry, IIT-Delhi
Date & Time: April 10, 2006 - 1:30pm
Location: 339 Wright-Rieman Chemistry

Hydrothermal Synthesis of Transition Metal Molybdates: Chemistry Issues
Chemistry and Chemical Biology

A. Ramanan, Chemistry, IIT-Delhi
1:30pm, 339 Wright-Rieman Chemistry

Polyoxomolybate (POM) cluster anions are ideal nano-building blocks to assemble a variety of hybrid crystals exhibiting compositional variation and structural diversity. A large number of POM based solids have been self-assembled from aqueous solution in the presence of organic molecules as structure-directors. In particular, role of organic amines has been extensively investigated towards the formation of discrete POM clusters to three-dimensional networks of molybdenum oxide based materials. A contemporary interest is to integrate another transition metal as part of the molybdate framework with a view to obtain bimetallic phases that can provide versatile catalytic features; also POMs will be ideal model systems to investigate magnetic properties from molecular magnetism to long range cooperative interactions. Hydrothermal chemistry is a popular chemie douce route to synthesize such materials. In this talk, we will share our success and failure in controlling the structures of transition metal molybdates as discrete clusters, extended solids or coordination polymers. We will demonstrate a few critical chemistry issues with suitable examples to design a rational solid. Magnetic properties of a few selected solids will be discussed.

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