Crystal engineering with ethynylbenzenes
Part 2. Structures of 4-trimethylsilylethynyl-N,N-dimethylaniline, and 4-ethynyl-N,N-dimethylaniline with Z′
= 12 and a single-crystal to single-crystal phase transition at 122.5 ± 2 K†
Abstract
The crystal and molecular structures of C–H groups. The orthorhombic crystals of 2 show no phase changes and have Z′
= 1.5 (3 half molecules) without short intermolecular contacts.