Khalil Feghali

A Paramagnetic Diniobium Complex with a Very Short Nb-Nb Distance: Evidence for a Pseudo Nb-Nb Triple Bond?

In spite of the short Nb-Nb distance (2.268 Å) and the presumable existence of an Nb identical withNb bond, the paddle-wheel-shaped diniobium(II) complex 1 is paramagnetic. Theoretical calculations indicate that the presence of LiCl moieties on the intermetallic axis lowers the Nb-Nb bond order and is responsible for the observed paramagnetism.

Di‐ and Trimanganese N,N′‐Dicyclohexylformamidinate Complexes

The alkali metal countercation of a N,N′-dicyclohexylformamidinate anion (Li or K) determines the structure and the oxidation state of the product of the reaction with [MnCl2(thf)2].

The reduction of Nb2Cl6(tmeda)2 by R2NLi. Formation of a diamagnetic niobium(II) cluster with short Nb–Nb triple bond and amide C–N bond cleavage

Reduction of trivalent Nb2Cl6(tmeda)2 with either lithium diisopropylamide or n-butyllithium yields a novel NbII cluster which performs oxidative addition into the amide C–N bond.