67664-24-8Relevant academic research and scientific papers
Thermal dihydrogen elimination from Cp*2Yb(4,5- diazafluorene)
Nocton, Gregory,Booth, Corwin H.,Maron, Laurent,Andersen, Richard A.
, p. 1150 - 1158 (2013)
The reaction of 4,5-diazafluorene with Cp*2Yb(OEt 2), where Cp* is pentamethylcyclopentadienyl, affords the isolable adduct Cp*2Yb(4,5-diazafluorene) (1), which slowly eliminates H2 to form Cp*2Yb(4,5-diazafluorenyl) (2); the net reaction is therefore 1 → 2 + H?. The ytterbium atom in 1 is shown to be intermediate valent by variable-temperature LIII-edge X-ray absorption near-edge (XANES) spectroscopy, consistent with its low effective magnetic moment (μeff). The experimental studies are supported by complete active space self-consistent field (CASSCF) calculations, showing that two open-shell singlets lie below the triplet state. The two open-shell singlets are calculated to be multiconfigurational and closely spaced, in agreement with the observed temperature dependence of the XANES and χ data, which are fit to a Boltzmann distribution. A mechanism for dihydrogen formation is proposed on the basis of kinetic and labeling studies to involve the bimetallic complex (Cp*2Yb)2(4,5- diazafluorenyl)2, in which the heterocyclic amine ligands are joined by a carbon-carbon bond at C(9)-C(9′).
REACTIONS OF AZAFLUORENONES WITH HYDRAZINE
Mlochowski, Jacek,Szulc, Zdzislaw
, p. 33 - 39 (2007/10/02)
Formation and transformations of hydrazones, phenylhydrazones and azines, azafluorenone derivatives, have been studied and the influence of positions of heterocyclic nitrogen atoms on the reduction mechanism discussed.An improved reduction method of azafluorenones to azafluorenes has been elaborated.
