Strong Closed-Shell Interactions in Inorganic Chemistry.

The coordination chemistry of the amidine ligand

Textbooks of inorganic chemistry describe the formation of adducts by coordination of an electron donor to an electron acceptor, often using the amine-boranes, X3N → BY3, as examples. In the Lewis (electron dot) formulas of the compounds, the dative bond in H3N → BH3 and the covalent bond in H3CCH3 are both represented by a shared electron pair. In the simple molecular orbital or valence bond models the wave functions of both electron pairs would be constructed in the same manner from the appropriate sp3 type atomic orbitals on the bonded atoms; the difference between the covalent and the dative bond becomes apparent only after the orbital coefficients have been analyzed. This may be the reason why many structural chemists seem reluctant to distinguish between the two types of bonds. The object of this article is to remind the reader that the physiocochemical properties of covalent and dative bonds may be – and often are – quite different, and to show that a distinction between the two provides a basis for understanding the structures of a wide range of main group metal compounds.

Covalent versus Dative Bonds to Main Group Metals, a Useful Distinction

The chemical modification of titanium alkoxides by alkoxy- and aminoalcohols, s-diketones, s-ketoesters, carboxylic and phosphonic acids, and related compounds, and the hydrolysis behavior of the organically modified precursors are reviewed Special focus is put on structural aspects and on the possibility to introduce functional organic groups Such precursors have a high potential for innovative materials syntheses because they permit control of the precursor reactivity in sol–gel processes and the preparation of titania-based inorganic–organic hybrid materials Coordination, solvation, aggregation and redistribution equilibria play an important role in the chemistry of the modified titanium alkoxides, and organic side reactions have to be taken into account

Chemical modification of titanium alkoxides for sol–gel processing

Multinuclear studies of aluminium compounds

Physico-chemical and structural investigation of aluminium isopropoxide

Crystal and molecular structures of triphenyltin chloride

Information on the structure of organometallic compounds of zinc, cadmium, and mercury published up to 1973 is summarised. Detailed consideration is given to true organometallic compounds, containing a metal–carbon bond. Compounds in which a carbon atom (hydrocarbon radical) is separated from the metal atom by a heteroatom are mentioned only for comparison, and no systematic description of their structures is given. The Review covers results obtained by X-ray and neutron diffraction, gas-phase, electron diffraction, and in part microwave and Raman spectroscopy. A list of 90 references is included.

https://iopscience.iop.org/article/10.1070/RC1975v044n01ABEH002247/pdf

The Structural Chemistry of Organic Compounds of Mercury and Its Analogues (Zinc and Cadmium)

https://link.springer.com/content/pdf/10.1007/BF00739461.pdf

N. G. Bokii

Papers

Physico-chemical and structural investigation of aluminium isopropoxide

Crystal and molecular structures of triphenyltin chloride

The Structural Chemistry of Organic Compounds of Mercury and Its Analogues (Zinc and Cadmium)

X-ray diffraction investigation of nonvalent interactions and coordination in organometallic compounds

Synthesis and structure of the 1,1′-trimethylenebenzene- cyclopentadienyliron cation.