S to I Charge Transfer Interactions for Mesoporous TM Oxides

O Is Oxygen, M is Transition Metal Centre, R is the Alkyl Chain of Alcohol 

The developed methods using the charge transfer interaction to synthesize ordered mesoporous materials are generic in terms of both reaction conditions, 

TM sources used, and postheat treatment conditions to remove the organic templates. There are numerous excellent review articles summarizing these conditions and the physicochemical properties of synthesized mesoporous oxide materials [13,39,46,71,87,88]. Typical TM sources in these studies are either TM alkoxides (i.e., titanium isopropoxide) or anhydrous TM chlorides. TM chlorides react with alcohols in situ to form TM alkoxides (i.e., WCle + 6C2H6O W(C2H50)6 + 6HC1) [46,79]. Typically, hydrolysis and condensation of TM sols in alcoholic solutions are controlled under low pH (0-4) conditions [11,14,46,86]. 

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