Rubidium and Cesium Enediamide Complexes Derived from Bulky 1,4-Diazadienes

The first rubidium
and cesium enediamide complexes based on bulky
1,4-diaza-1,3-diene ligands (DADs) have been prepared by metalation
of either 1,4-bis­(2,6-diisopropylphenyl)-1,4-diaza-1,3-butadiene (1, = H2DADDipp) or 1,4-bis­(2,6-diisopropylphenyl)-2,3-dimethyl-1,4-diaza-1,3-butadiene
(2, = Me2DADDipp) with an excess
of Rb or Cs metals in coordinating solvents such as tetrahydrofuran
(THF) or 1,2-dimethoxyethane (DME). All new complexes were fully characterized
by spectroscopic and analytical methods as well as single-crystal
X-ray diffraction studies.