| Abstract
| - The divinyl derivative Fe[(η5-C5H4)(Me2SiCHCH2)]2 (1), prepared by the low-temperaturereaction of 1,1‘-dilithioferrocene·TMEDA with ClSiMe2(CHCH2), has been used as a readilyfunctionalizable core unit for the synthesis of multimetallic systems. The hydrosilylationreaction of 1 with Cl2MeSiH and Ph2MeSiH provides the tetrafunctional ferrocenes Fe[(η5-C5H4)(SiMe2(CH2)2SiMeCl2)]2 (2) and Fe[(η5-C5H4)(SiMe2(CH2)2SiMePh2)]2 (5), which afterreaction with Fe(η5-C5H4Li)(η5-C5H5) and Cr(CO)6, respectively, afforded the pentametallicmolecules Fe[(η5-C5H4)(SiMe2(CH2)2SiMeFc2)]2 (3) (Fc = (η5-C5H4)Fe(η5-C5H5)) and Fe[(η5-C5H4)(SiMe2(CH2)2SiMe{(η6-C6H5)Cr(CO)3}2)]2 (6). Characterization of the synthesized molecules by 1H, 13C, and 29Si NMR and IR spectroscopy, mass spectrometry, and elementalanalysis supports their assigned structures. The electrochemical behavior has been studied.While 3 contains two pairs of outer silicon-bridged ferrocenyl units, in which the iron centersinteract with one another, in the related 6 the chromium tricarbonyl groups complexed toarene rings, also joined by a single silicon, are essentially noninteracting.
- 1,1‘-Bis(dimethylvinylsilyl)ferrocene (1) has been used successfully as a readily functionalizable starting core, for the synthesis of the novel redox-active homo- and heterometallic pentanuclear molecules 3 and 6. The degree of interaction between the silicon-bridged metal-based moieties depends on their chemical nature.
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