General Aspects of Structure

Experimentally determined and theoretically calculated electron density distribution functions of the fluoroquasisilatrane 84 have been investigated [214]. 

The quanrnm theory of atoms in molecules (QTAIM or AIM) [215-217] is now often used for the analysis of the electron density distribution in higher-coordinated silicon complexes. There are further works dealing with the properties of chemical bonding in 1-hydrosilatrane [218], 1-fluorosilatrane [219], several complexes of tris(pentafluorophenyl)silanes with neutral Lewis bases [92], and chlorosUanes of the composition Cl3 H SiOCH2CH2NMe2 (n = 1-3) [220]. 

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Outside this chapter on general aspects of structure, bonding, syntheses, and reactivities the material will be presented according to the position of the metals in the periodic table. For heteronuclear clusters the compounds will be treated as belonging to the metal later in the periodic table. Compounds mentioned in this review without giving a reference have been dealt with in former reviews. 

Several specific structure-property relationship issues are described below. Previous reviews have covered the chemistry of boron clusters in the context of preparation of mesogenic derivatives, their electronic properties,and some general aspects of structure-property relationships. ... 

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