Macrobicyclic germanium-capped

The binuclear germanium-capped clathrochelate [Fe2DA03(Ge(CF3)3)2] oximehydrazonate was obtained by a template condensation of the tetradentate H2DAO ligand with IGe(CF3)3 in an aqueous solution in the presence of CaCOs (Reaction 52). The resulting intramolecular macrobicyclic compound precipitated from the reaction mixture, and the equilibrium shift due to the formation of the solid allowed one to isolate this complex in a relatively high yield [73]. 

Cyclic voltammetric data (mV) for macrobicyclic boron-, tin-, antimony- and germanium-capped iron(II) oximehydrazonates and a-dioximates [73, 74, 188],... 

Complexes with type I.II ligands are usually referred to as boron (tin, germanium, silicon, antimony)-capped macrobicyclic dioximates (oximehydrazonates, azineoximates). Their abbreviated... 

The spectral characteristics for tin-, germanium-, and antimony-capped macrobicyclic iron(II) dioximates differ greatly from those of the corresponding boron-capped complexes discussed above. 

The electrochemical behaviour of the macrobicyclic boron-, germanium-, antimony-, and tin-capped iron, cobalt, and ruthenium dioximates has been studied by cyclic voltammetry, polarography, and electrolytic experiments [41, 52, 64, 65, 68, 73, 74, 77, 78, 328-330]. For every metal ion, the dependence of the redox potentials on the electronic characteristics of the substituents in the dioximate... 

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... 

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