Building-block Built-up Synthetic Route

Construction of Open-framework Metal Phosphates through Building-block Built-up Approach 

Recently, through the building-unit approach, Rao systematically studied the construction of open-framework zinc phosphates by using 1-D zinc phosphate chains similar to AlPO-CSC and D4R units.[123] 

Construction of D4R-containing Zeolites by using Ge as a Silica Substituent Recently, the use of germanium as a silica substituent coupled with the use of novel SDAs by Corma et al. has led to the discovery of many new D4R-containing zeolite 

ITQ-15 (UTL), having the same framework topology as IM-12, was prepared by using l,3,3-trimethyl-6-azoniatricyclo[3.2.1.46 6]dodecane hydroxide as the SDA.[134] The synthesis of ITQ-15 involved the hydrothermal reaction of a gel with molar composition 0.91 Si02 0.09 Ge02 0.01 A1203 0.5 [Ci4H26X]OH 10 H20 at 448 (175°C) K for 18 d. 

Therefore, the Ge-directed approach has facilitated the formation of a range of D4R-containing zeolites, and more significantly, the formation of zeolites with interconnected channel systems. To sum up, the building-unit approach will open a new gate to the rational synthesis of inorganic microporous crystalline materials. 

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