Abstract
The reduction of C 70 with strontium, dissolved in liquid ammonia, in a molar ratio of 2:3 and crystallisation under solvothermal pressure at room-temperature results in the formation of crystalline [Sr(NH 3) 8] 3(C 70) 2·19NH 3. The crystal structure ( P 1 ̄ , a=1594.7(1) pm, b=1656.3(1) pm, c=2409.5(2) pm, α=79.664(1)°, β=75.207(1)°, γ=80.460(1)°, Z=2, R 1=0.082, 14301 reflections) is built up of polymeric chains 1 ∞ [C 70 3−] arranged in a distorted hexagonal close packing of rods parallel [ 1 ̄ 2 1 ̄ ] intersected by layers of [Sr(NH 3) 8]-polyhedra extending parallel (111). Quantum chemical results on the model systems [C 70(CH 3) 2] n− ( n=2, 3, 4) are discussed in comparison to the accurate crystal structure data in order to analyse the total charge, charge distribution and the bonding character due to the structural response of the C 70 fullerene units upon reduction.
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