Cis and Trans Rhenium Hydrido Dinitrogen Complexes from Protonation Reactions of Cp*Re(PMe3)2(N2)

Autor:	Antonio Cusanelli, Derek Sutton
Rok vydání:	1996
Předmět:	Inorganic Chemistry chemistry Stereochemistry Ligand Organic Chemistry Cationic polymerization chemistry.chemical_element Protonation Nuclear magnetic resonance spectroscopy Physical and Theoretical Chemistry Rhenium Cis–trans isomerism
Zdroj:	Organometallics. 15:3717-3722
ISSN:	1520-6041 0276-7333
DOI:	10.1021/om960185b
Popis:	The dinitrogen complex Cp*Re(PMe3)2(N2) (1) undergoes protonation at rhenium but not at the rhenium-bound dinitrogen ligand under conditions described here. Protonation by using CF3CO2H, HBF4·OEt2, or CF3SO3H at 213 K afforded the respective rhenium hydrido dinitrogen complexes cis-[Cp*ReH(N2)(PMe3)2][CF3CO2] (cis-2(CF3CO2)), cis-[Cp*ReH(N2)(PMe3)2][BF4] (cis-2(BF4)), and cis-[Cp*ReH(N2)(PMe3)2][CF3SO3] (cis-2(CF3SO3). These complexes isomerized smoothly to the corresponding trans isomers as the temperature was raised to 273 K. The cis and trans isomers have been fully characterized by using a combination of IR and 1H, 31P, and 15N NMR spectroscopy, with the dinitrogen ligand singly-labeled in either the Nα or Nβ positions. The trans isomers are all thermally unstable at room temperature, but trans-2(CF3CO2) is significantly more stable than its analogs, indicating that the counteranion may play a role in stabilizing these cationic rhenium hydrido dinitrogen complexes.
Databáze:	OpenAIRE
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