In recent years, there has been an increasing demand for the development of clean and efficient energy sources/carriers to replace fossil fuels. Seeking renewable energy sources/carriers that are clean and abundant is imperative. [1,2] Hydrogen is the most abundant element in the universe and has great potential to become one of the dominant energy carriers in the future. Moreover, the sole by-product of the reactions between hydrogen and oxygen in the generation of energy is water, an environmentally clean species, which is another significant advantage, making this fuel superior to petroleum or other energy sources being used currently. [3] However, due to its low volumetric energy density, adequate storage of hydrogen becomes a key issue that must be addressed if the hydrogen economy is to be developed. The question is how to pack hydrogen into as small a space as possible without using excessively high pressure or very low temperature. This need has led to an intense search for efficient storage materials, but, unfortunately, no current technologies are good enough for commercialization.[4]Recently, we have begun to explore a new type of storage media, microporous metal organic frameworks (MMOFs), a subset of the general family of metal organic frameworks (MOFs). The MMOFs contain very small pores with pore dimensions in the range of micropores (< 20 Å), often ultramicropores (< 7 Å). They exhibit similar sorption properties to other porous materials characteristic of physisorption, including carbon-based materials, silica, and alumina. However, they also demonstrate some apparent advantages over these systems.[5] For example, the MMOFs incorporate metals that are likely to interact with adsorbed hydrogen more strongly than other types of sorbents. They contain perfectly ordered channels that allow hydrogen to effectively access the interior space. The synthesis is simple, highly reproducible, and cost-effective. Furthermore, the crystal structures and pore properties of MMOFs can be systematically modified to improve hydrogen uptake. [6] Compound 1 was insoluble in common organic solvents, but could be converted to the precursor upon refluxing with mixed solvents of H 2 O/EtOH (1:10). Crystals of 1 can also be grown by reactions of Zn(NO 3 ) 2 ·6H 2 O, bpdc, and bpy in DMF (molar ratio of 1:1:1:0.65). Single-crystal X-ray diffraction showed that the crystal structure of 1 is different but closely related to [Co 3 (bpdc) 3 bpy]·4DMF·H 2 O (2). [7] The structure of 1 possesses two crystallographically independent zinc centers (Zn1 and Zn2). [8] Two Zn1 atoms and a Zn2 atom form a trinuclear metal cluster [Zn 3 (bpdc) 6 (bpy) 2 ]. As shown in Figure 1a, this building block is composed of one octahedral metal (Zn2) located at the center and two tetrahedral metals (Zn1) situated at two ends.