[5]Trovacenyl Boronic Acid, (η7-C7H7)V[η5-C5H4B(OH)2], and Its Anhydride Tri([5]trovacenyl)boroxine, 1,3,5-[(η7-C7H7)V(η5-C5H4)]3B3O3 ,1

Autor:	Jürgen Pebler, Klaus Harms, Matthias Wolf, Christoph Elschenbroich
Rok vydání:	2003
Předmět:	Hydrogen bond Organic Chemistry Boroxine Redox law.invention Inorganic Chemistry chemistry.chemical_compound Crystallography Paramagnetism chemistry law Antiferromagnetism Physical and Theoretical Chemistry Electron paramagnetic resonance Hyperfine structure Boronic acid
Zdroj:	Organometallics. 23:454-459
ISSN:	1520-6041 0276-7333
Popis:	The paramagnetic boronic acid (η7-C7H7)V[η5-C5H4B(OH)2] (3•) has been prepared and characterized structurally, emphasis being placed on hydrogen bonding motives present in the crystal. EPR spectroscopy reveals that association of 3• is absent in fluid solution. Tri([5]trovacenyl)boroxine, 4•••, the cyclic anhydride of 3•, engages in antiferromagnetic exchange; magnetic susceptometry provides the value J(4•••) = −1.04 cm-1. Accordingly, the EPR spectrum of 4••• in fluid solution points to 22 51V hyperfine components separated by one-third of the coupling constant of mononuclear trovacene derivatives. Redox splittings δE1/2 between consecutive oxidation steps of 4••• are not resolved, i.e., δE1/2 ≤ 60 mV.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b53b85e3d6f743c6f92d44219f987717 https://doi.org/10.1021/om030574n Zobrazit plný text záznamu