Mono complexes germanium

Germanium Porphyrins. The electrosynthesis of a-bonded mono-alkyl or mono-aryl germanium porphyrins involves the conversion of (P)Ge(R)2 to (P)Ge(R)X where X is an anionic ligand. A standard Grignard reaction between (P)Ge(Cl)2 and RMgX leads to the o-bonded bis-alkyl or bis-aryl complexes, (P)Gp(R)2. These complexes were initially synthesized as lH IWR shift reagents(28,29). However, almost no reactivity of these species was reported until several years later when it was shown that the... 

The range of organo-silicon, germanium, tin, and lead porphyrin complexes reported to date are given in Table Some mono- and dialkyltin... 

Various monocyclic and bicyclic pentacoordinate anionic germanium and tin complexes are known which possess bidentate dianionic oxo and related ligands, such as aliphatic or aromatic 1,2-diols, a-hydroxy carboxylic acids and their thio analogues (for early references see References 191, 307-309). Anionic mono- and bis-chelated germanium and... 

As in the spirocyclic five-coordinated germanium complexes discussed above, the geometry about the tin atom in some of the mono- and bi-cyclic stannates, listed in... 

The redox properties of macrobicyclic iron(II) mono- and binuclear oximehydrazonates and a-dioximates formed by capping with antimony(V) and germanium(IV) triorganyles were studied by cyclic voltammetry [73, 74]. The electrochemical behaviour of these compounds is similar to that of analogous boron- and tin-capped clathrochelates. Oxidation of all mononuclear complexes involves a one-electron process, assigned to the oxidation of encapsulated iron(II) ion to iron(III) ion. This process is electrochemically... 

Hydroxy acids, such as tartaric, do not form complexes with silicon as they do with the larger germanium atom, according to Clark and Waddams (177), who examined a large number of mono- and polyhydroxy aliphatic acids, including those derived from sugar. 

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