Abstract
Two, acyclic (1) and cyclic (2), steroidal molecular rotors containing 1,4-diethynyl-2,3-difluoro-phenylene units as rotators were investigated by means of single crystal X-ray diffraction, high re...
Highlights
One of the most challenging issues in modern science and technology is the development of strategies which allow, at the molecular level, the construction of materials with desired functions in the solid state
The crystal structures of both 1A and 1B were established by means of single crystal X-ray diffraction studies
In this work we examined single crystal X-ray diffraction and high resolution solid state NMR spectroscopy data for acyclic and cyclic steroidal molecular rotors containing 1,4-diethynyl2,3-difluoro-1,4-phenylene units as rotators with the aim to explain the correlation between the size of difluoro-phenylene units and free space in the crystal lattice required for molecular reorientation and further topology and time scale of dynamic processes
Summary
One of the most challenging issues in modern science and technology is the development of strategies which allow, at the molecular level, the construction of materials with desired functions in the solid state. The topology and time scale of molecular motion in the solid state is correlated with the presence of available space. In many cases this free volume contributes in few percent to the total volume, but it allows the dynamical moieties to achieve enough freedom
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