Molecular sieves germanium structures

In 1982 a major discovery of a new class of aluminophosphate molecular sieves was reported by Wilson et al. By 1986 some 13 elements were reported to be incorporated into the aluminophosphate frameworks lithium (Li), beryllium (Be), boron (B), magnesium (Mg), silicon (Si), titanium (Ti), manganese (Mn), iron (Fe), cerium (Ce), zinc (Zn), gallium (Ga), germanium (Ge), and arsenic (As). lliis new generation of molecular sieve materials designated AlP04 based molecular sieves comprise more than two dozen structures and about 200 compositions. 

Sulfide Molecular Sieves. All crystalline molecular sieves and microporous crystals have so far been based on oxide frameworks. As discussed previously, the oxide-based molecular sieve family shows rich compositional and structural diversity, and the number of new species is still growing at a rapid rate. An important new direction for molecular sieves is provided by the recent discovery of sulfide-based molecular sieves. The first publication on these materials already described a whole family of sulfide molecular sieves containing germanium (Ge) and tin (Sn) or several other metals. The crystal structures are all new and include 12 unique framework structures. These materials may have potential applications using sulfur-containing feedstocks in which the sulfur present may stabilize the composition of the sulfide molecular sieve. 

---