Abstract
Tren amine cations and carbonate anions adopt a ternary symmetry while
tetra amine cations are tetrahedral. The symmetry of these constitutive ions influences strongly the nature of the solids which crystallise from solutions. Large fluorinated aluminate polyanions with tetrahedral symmetry appear in the presence of
tren amine, while infinite chains of AlF
6 octahedra are observed with
tetra amine and that noncentrosymmetric structures are frequently encountered in rare earth fluoride carbonates.
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