Reactions of FcB(Me)Br [1; Fc = (C5H5)Fe(C5H4)] and 1,1′-fc[B(Me)Br]2 [2; fc = (C5H4)2Fe] with 2,5-bis(pyridyl)pyrazine (bppz) and 2,2′:4′,4″:2″,2[triple prime]-quaterpyridine (qpy) are reported. The pyrazine derivative bppz forms stable boronium cations with 1 and 2 to give the complexes [FcB(Me)bppz]Br, [1C]Br, and {1,1′-fc[B(Me)bppz]2}Br2, [2C2]Br2. The 4,4′-bipyridine derivative qpy can be used to link two ferrocenylborane moieties together, which gives access to the open-chain dinuclear aggregate [FcB(Me)qpyB(Me)Fc]Br2, [1D1]Br2, and to the macrocyclic molecule [2D]2Br4. The bppz adducts possess an intense green colour, and the qpy complexes are deeply blue coloured, which is indicative of charge-transfer interactions between the electron-rich ferrocene moieties and their electron-poor aromatic substituents. The hexafluorophosphate salts of all compounds undergo a reversible ferrocene oxidation and several consecutive reduction processes, which are centred at the cationic sidechains
Ding, L., Ma K., B., Durner, G., Bolte, M., Fabrizi De Biani, F., Zanello, P., et al. (2002). Reactions of ferrocenylboranes with 2,5-bis(pyridyl)pyrazine and quaterpyridine: charge-transfer complexes and redox-active macrocycles. JOURNAL OF THE CHEMICAL SOCIETY. DALTON TRANSACTIONS(8), 1566-1573 [10.1039/b110993f].
Reactions of ferrocenylboranes with 2,5-bis(pyridyl)pyrazine and quaterpyridine: charge-transfer complexes and redox-active macrocycles
Fabrizi De Biani, Fabrizia;Zanello, Piero;
2002-01-01
Abstract
Reactions of FcB(Me)Br [1; Fc = (C5H5)Fe(C5H4)] and 1,1′-fc[B(Me)Br]2 [2; fc = (C5H4)2Fe] with 2,5-bis(pyridyl)pyrazine (bppz) and 2,2′:4′,4″:2″,2[triple prime]-quaterpyridine (qpy) are reported. The pyrazine derivative bppz forms stable boronium cations with 1 and 2 to give the complexes [FcB(Me)bppz]Br, [1C]Br, and {1,1′-fc[B(Me)bppz]2}Br2, [2C2]Br2. The 4,4′-bipyridine derivative qpy can be used to link two ferrocenylborane moieties together, which gives access to the open-chain dinuclear aggregate [FcB(Me)qpyB(Me)Fc]Br2, [1D1]Br2, and to the macrocyclic molecule [2D]2Br4. The bppz adducts possess an intense green colour, and the qpy complexes are deeply blue coloured, which is indicative of charge-transfer interactions between the electron-rich ferrocene moieties and their electron-poor aromatic substituents. The hexafluorophosphate salts of all compounds undergo a reversible ferrocene oxidation and several consecutive reduction processes, which are centred at the cationic sidechainsI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
https://hdl.handle.net/11365/23209
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