research papers
Crystals of hexa-tert-butyldisilane undergo a reversible phase transition at 179 (2) K. The space group changes from Ibca (high temperature) to Pbca (low temperature), but the lattice constants a, b and c do not change significantly during the phase transition. In a new polymorph of 1,1,2,2-tetra-tert-butyl-1,2-diphenyldisilane, two independent molecules have rather similar conformations.