Germanium-nitrogen compounds

FIGURE 19. Germanium-nitrogen compounds which have been investigated in Reference 114... 

Organometallic Nitrogen Compounds of Germanium, Tin, and Lead, 3, 397 Organometallic Pseudohalides, S, 169 Organometallic Reaction Mechanisms, 4, 267 Organopolysilanes, 6, 19... 

The methods for the preparation of compounds containing germanium-nitrogen bonds have been the subject of a recent review.140... 

Dehydrohalogenation reactions appeared to be a convenient route to double bond germanium nitrogen species and were commonly carried out with an organolithium compound as a base.3,4 5b 6 7 96,97 123 Accordingly, the synthesis of two moderately hindered stable germanimines Mes2Ge = NR 136 and 137 has been reported.59 Stabilization in these cases is achieved... 

Reactivity of stable germanium-nitrogen double bond compounds has been widely documented in previous reviews.3,4,6,7,119... 

Silicon (Si) and germanium (Ge) are in the same group of the periodic table as carbon, and they form tetrahedral compounds as carbon does. When four different groups are situated around the central atom in silicon, germanium and nitrogen compounds, the molecules are chiral. Sulphoxides, where one of the four groups is a nonbonding electron pair, are also chiral. 

Optical activity was first observed with organic compounds having one or more chiral carbon atoms (or centres) (i.e. a carbon substituted with four different groups). In the structures (1) to (17) the chiral carbons are specified with an asterisk. Subsequently compounds having chiral centres at suitably substituted heteroatoms (e.g. silicon, germanium, nitrogen, phosphorus, arsenic, sulphur, etc.) were also synthesised. Molecular dissymmetry, and hence chirality, also... 

Comparison of theoretical data with experimental spectra led also to the identification of compounds which have germanium-nitrogen double and triple bonds. Foucat et al. report about the results of flash vacuum thermolysis of substituted germacyclopentenes and DFT (B3LYP) calculations of model compounds of possible reaction products114. The authors took the experimental photoelectron (PE) spectra and compared them with... 

B. Wrackmeyer and E. Kupce, N NMR of Silicon, Germanium, Tm and Lead-Nitrogen Compounds, in Topics of Physical Organometallic Chemistry, Vol. 4 (ed. M. Gielen), pp. 289-352, Freund Publishing House, Tel Aviv, 1992. 

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