Inorganic network

The interesting properties of hybrid organic/inorganic network structures are described in the work of Schmidt (p. 333) and Wilkes (p. 354). 

Inorganic networks, especially glasslike gnes can be characterized by the ratio of network forming (e.g. [siO ] ) to network modifying (e.g. =Si-0 Na ) units. Network formers (e.g. SiO, B 03, A 2°3 T 2 are (in opposition to the majority of organic units) three-dimensional crosslinking units. 

A convenient method to introduce organic functions into inorganic networks is the use of substituted siliceous acid esters and the sol-gel route. The basic reactions, therefore, are given in Equations 1 and 2. Equation 1 describes the sol-gel reaction to a borosilicate glass. 

Figure lb gives the scheme of another type of structures Organic polymeric chains are introduced into an inorganic network by polymerization. Numerous types of reactions can be used for synthesis like vinyl... 

Organic Network Formers. As indicated above, an additional organic network can be built up by organic polymer synthesis within an inorganic network. The basic principles are shown in Equations 3 to 5 with a vinyl, methyl methacrylate and epoxide polymerization ... 

Kim J, Grate JW (2003). Single-enzyme nanoparticles armored by a nanometer-scale organic/ inorganic network. Nano Lett. 3 1219-1222. 

Alberti G, Costantino U (1996) In Alberti G, Bein T (eds) Solid State Supramolec-ular Chemistry Two- and Three-Dimensional Inorganic Networks. Comprehensive Supramolecular Chemistry, vol 7, Chapter 1. Pergamon and Elsevier Science, Oxford... 

Polyacrylic acid Hybrid organic/inorganic network polymers were formed via the reaction of polyacrylic acid with tin(IV). titanium(IV), and silicon (IV) alkoxides and subsequent hydrolysis to form mesoporous materials. Treatment by nitric acid removed the polyacrylate template and produced microporous inorganic hydrous metal oxides Surface areas characterized by BET measurements 130... 

Novel Ordered Mesoporous Materials with Hybrid Organic-Inorganic Network in the Frameworks... 

Figure 3. Schematic representation of two different hexagonal arrangements in mesostructured inorganic / surfactant composites the hydrophobic chains are drawn as straight lines for simplicity, (a) The normal structure with a fully-connected inorganic network (dark area), (b) Inverse surfactant assemblies with single domains of the inorganic material enclosed in the centres. In the latter case the hydrophobic surfactant chains are allowed more space for their distribution, leading to a smaller d spacing. In this picture they are also interpenetrating each other.

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