Molecular "compasses" and "gyroscopes". I. Expedient synthesis and solid state dynamics of an open rotor with a bis(triarylmethyl) frame.

摘要: We describe our efforts toward the preparation of materials built with molecules possessing topologies analogous to those macroscopic compasses and gyroscopes. Samples 1,4-bis(3,3,3-triphenylpropynyl)benzene (3) were prepared by a simple two-step procedure from triphenylmethyl chloride (1) 1,4-diiodobenzene. The structure compound 3 is such that central phenylene can play role gyroscope wheel while two tritylpropynyl groups act as an axle shielding framework. Crystals benzene clathrate characterized single crystal X-ray diffraction variable-temperature solid state NMR their thermal stability was determined differential scanning calorimetry (DSC) thermogravimetric analysis (TGA). rotational dynamics group in desolvated samples terms two-fold flipping process. Solid barriers ca. 12.8 14.6 kcal/mol estimated for and...