Metal-organic frameworks oxalate structures

Several open-framework metal oxalates have been synthesized and characterized in last two to three years. They include ID, 2D and 3D structures. Following the success of the amine phosphate route to open-framework metal phosphates, reactions of organic amine oxalates with metal ions have been carried out. These reactions have yielded a hierarchy of zinc oxalates as shown in Figure 7. These different structures are mutually related. 

One remarkable aspect of many of these materials, as well as the hybrid metal oxide materials discussed in the next section, is that templates are rarely used in their synthesis. Instead, the open architectures are a consequence of interactions between the organic and inorganic groups. One notable exception is an open-framework zinc oxalate where the organic template, guanadinium, occupies a system of channels in the structure [134]. 

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