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Chalcogenide framework

Porous chalcogenide aerogels is another broad class of non-oxidic framework that prepared by template-free routes [71-73]. These materials possess a continuous nanostructured chalcogenide framework that is penetrated by a random network of nanopore channels. Because these high surface area structures are random and not exhibit long-range pore periodicity, such systems are outside of the scope of this review and will not be covered further. [Pg.150]

Dimensional reduction has been set forth as a general method for dismantling noncluster metal-halide and -chalcogenide frameworks in a controlled, predictive manner (74). In such a reaction, a binary parent compound ML is heated with n equivalents of a dimensional reduction agent AJL, where A is significantly more electropositive than M. [Pg.12]

For all preceding chalcogenide compounds prepared in supercritical amines, the metal centers are always monovalent. This includes both the alkali metal and the transition metal. In attempts to make more electronically interesting compounds, the inclusion of polyvdent metal ions with open shells in the chalcogenide framework was attempted. This was done by replacing the alkali metal cations with divalent cations or trivalent rare earth cations. However,... [Pg.235]

Metal chalcogenides, apart from their technological significance in industrial applications, have played an important role in the development of new synthetic concepts and methods in the area of solid-state chemistry. A great example is alkali metal intercalation into TiS2 (Chap. 6) first reported three decades ago, which highlighted the then-novel synthetic approach called soft chemistry chimie douce). This low-temperature process allows for new compounds to be obtained while retaining the structural framework of the precursor. Related to this concept is the... [Pg.27]

Recently, we demonstrated that the Zintl clusters [Geg]" react with chalcogen atoms (S, Se, and Te) in the presence of surfactant templates to form ordered mesoporous Ge-rich chalcogenides [74]. The mesostructured frameworks grow through a coupling reaction of (Ge9)-clusters with chalcogens in formamide/ethy-lenediamine mixture solution in an unusual reaction that seems to be a redox process (5). [Pg.150]

The mesoporous NU-GeQ-A chalcogenides exhibit high internal surface areas in the range of 350-516 m /g and quite narrow size distribution of pores with pore diameter at 2.9-3.1 nm. The framework wall thickness varies from 1.5 to... [Pg.150]


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