Trovacene Chemistry. 16, 1,1a-Di([5]trovacenyl)-1,1,1a,1a-tetraphenyl-disiloxane: Electro- and Magneto-Communication Across a Si-O-Si Spacer

Autor:	Feng Lu, Mathias Nowotny, Christoph Elschenbroich, Olaf Burghaus, Klaus Harms
Rok vydání:	2007
Předmět:	Chemistry Stereochemistry Disiloxane Redox law.invention Inorganic Chemistry Silanol chemistry.chemical_compound Crystallography Molecular geometry Fluid solution Polarizability law Cyclic voltammetry Electron paramagnetic resonance
Zdroj:	Zeitschrift für anorganische und allgemeine Chemie. 633:2386-2394
ISSN:	1521-3749 0044-2313
DOI:	10.1002/zaac.200700275
Popis:	By means of lithiation and subsequent derivatization [5]trovacenyl-diphenylsilanol (2·), di([5]trovacenyl)tetraphenyl-disiloxane (3··), di([5]trovacenyl)tetramethyl-disiloxane (4··) and di([5]trovacenyldimethylsilyl)methane (6··) have been prepared and characterized by X-ray diffraction (2·, 3··, 6··). Although the bond angles of the disiloxane bridges differ considerably, magnetic exchange interaction in these organometallic diradicals is practically unaffected as shown by fluid solution EPR spectroscopy. By way of contrast, electrocommunication clearly responds to change in the structure of the SiOSi spacer in that the redox splittings derived from cyclic voltammetry display the gradation δE1/2 (0/–/2–) 4·· < 6·· < 3··. It is proposed that in this order electronic polarizability in the intervening spacer increases thereby facilitating the transmission of electrostatic effects.
Databáze:	OpenAIRE
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