Crystal structure of (dibenzo-21-crown-7)di-iodido-samarium(II) 1,2-di-meth-oxy-ethane hemisolvate.

The title compound, [SmI2(C22H28O7)]·0.5C4H10O2 or Sm(dibenzo-21-crown-7)I2·0.5dimethoxyethane, was obtained as a minor product by layering di-meth-oxy-ethane solutions of SmI2 and dibenzo-21-crown-7. The asymmetric unit consists of one Sm(dibenzo-21-crown-7)I2 moiety and half a di-meth-oxy-ethane solvent mol-ecule in the outer sphere. Of the seven oxygen atoms available for coordination in dibenzo-21-crown-7, only six are coordinated, forming a plane of coordination around samarium(II). The remaining oxygen and its adjacent benzene ring 'jack knife' perpendicularly relative to this plane of coordination.