Supercritical fluids as media for inorganic chemistry

In this section, we describe selected examples of inorganic reactions that are carried out in supercritical water (SCH2O) 

By altering the precursor, different oxides of a given metal can be obtained. By adjusting the temperature and pressure of the SCH2O medium, it is possible to control particle size. Such control is important for the production of optical Ti02 coatings (see Box 22.3). 

A homoleptic complex is of the t rpe [MLj,] where all the ligands are identical. In a heteroleptic complex, the ligands attached to the metal ion are not all identical. 

The following terms were introduced in this chapter. Do you know what they mean  

Addison (1980) Chemical Reviews, vol. 80, p. 21 - An article focusing on the uses of N2O4 and HNO3 in non-aqueous systems. 

In this section, we describe selected examples of inorganic reactions that are carried out in supercritical water (SCH2O) and ammonia (SCNH3), critical temperatures and pressures of which are listed in Table 8.11. An important application of SCH2O is in the hydrothermal generation of metal oxides from metal salts (or supercritical hydrothermal crystallization). Equations 8.84 and 8.85 summarize the proposed steps for conversion of metal nitrates to oxides where, for example, M = Fe(III), Co(II) or Ni(II). 

Yb (reaction 8.89), the products contain [M(NH3) ] + or [M(NH3) ] ions. For La and Yb, these represent the first examples of homoleptic lanthanoid ammine complexes. 

University Press, Oxford - A book in the OUP Primer series which gives a good introduction to the topic. 

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