Inorganic Chemistry, Vol.44, No.20, 7243-7248, 2005
Polyhedral cobalt(II) and iron(II) siloxane: Synthesis and X-ray crystal structure of [(RSi(OH)O-2)Co(OPMe3)](4) and [(RSiO3)(2)(RSi(OH)O-2)(4)(mu(3)-OH)(2)Fe-8(THF)(4)] (R = (2,6-iPr(2)C(6)H(3))N(SiMe3))
The cobalt(II) and iron(II) siloxane compounds were prepared by the reaction of lipophilic N-bonded silanetriol 1 with metal silylamides M[N(SiMe3)(2)](2) (M = Co (2), Fe (3)) in a 1:1 and 3:4 molar ratio, respectively. A plot of 1/chi versus temperature in the range of 2-300 K indicates the paramagnetic behavior of 2 and 3. The composition and molecular structures of 2 and 3 were fully determined by IR, elemental analysis, and X-ray crystal structural analyses. Compound 2 possesses a pseudo-4-fold (S-4) symmetry, whereas 3 reveals an inversion center. Compound 2 represents a tetracobalt(II) drum while 3 exhibits an octairon(II) cage containing siloxane ligands.