16733-97-4Relevant articles and documents
Electron-Deficient Imidazolium Substituted Cp Ligands and their Ru Complexes
Mazzotta, Fabio,Zitzer, Georg,Speiser, Bernd,Kunz, Doris
, p. 16291 - 16305 (2020)
The synthesis of electron-poor mono-, di- and tri(imidazolium)-substituted Cp-ylides is presented and their electronic properties are discussed based on NMR spectroscopy, X-ray structure analyses, electrochemical investigations and DFT calculations as well as by their reactivity toward [Ru(CH3CN)3Cp*](PF6). With mono- and di(imidazolium)-substituted cyclopentadienides the respective monocationic and dicationic ruthenocences are formed (X-ray), whereas tri(imidazolium) cyclopentadienides are too electron-poor to form the ruthenocenes. Cyclic voltammetric analysis of the ruthenocenes shows reversible oxidation at a potential that increases with every additional electron-withdrawing imidazolium substituent at the Cp ligand by 0.53–0.55 V in an electrolyte based on a weakly coordinating anion. A reversible oxidation can be observed for the free 1,3-disubstituted ligand as well.
The Photolysis of Cyclopentadienyl Compounds of Tin and Mercury. Electron Spin Resonance Spectra and Electronic Configuration of the Cyclopentadienyl, Deuteriocyclopentadienyl, and Alkylcyclopentadienyl Radicals
Barker, Philip J.,Davies, Alwyn G.,Tse, Man-Wing
, p. 941 - 948 (1980)
Cyclopentadienyl derivatives of tin(IV) and mercury(II) and alkylcyclopentadienyl derivatives of mercury(II) are photolysed in solution to show the e.s.r. spectra of the appropriate radicals RC5H4. (R = H, D, Me, Et, Pri, or But).The C5H5. radical is a planar ?-radical with average D5h symmetry, and its spectrum is broadened in the presence of organic bromides, perhaps by a charge-transfer mechanism.The introduction of alkyl groups breaks the degeneracy of the ψA and ψS molecular orbitals of the ?-system by electron release, destabilising the ψS MO, and the e.s.r. spectrum reflects the spin density distribution in the configuration ψA2ψS1.Deuterium has a small but detectable perturbing effect: the ψA MO is destabilised by ca. 100 J mol-1, and thermal mixing of the two energy levels results in the configuration ψS1.515ψA1.485.This is compatible with the model of a vibrational perturbation of the resonance integral β, rather than of the Coulomb integral α.
A method for the determination of the degree of association of organolithium compounds in liquid ammonia
Besten, Remco den,Harder, Sjoerd,Brandsma, Lambert
, p. 153 - 159 (2007/10/02)
A method for carrying out cryoscopy in liquid ammonia is presented.The degrees of association of some organolithium compounds in liquid ammonia have been determined.
