Phase transitions and crystal structures of organometallic ionic plastic crystals comprised of ferrocenium cations and CH2BrBF3 anions

In this study, we synthesized the salts [Fe(C5Me5)2][CH2BrBF3] (1), [Fe(C5Me4H)2][CH2BrBF3] (2), and [Fe(C5H5)2][CH2BrBF3] (3) containing the CH2BrBF3 anion in order to investigate the effect of anion symmetry. These salts underwent phase transitions to a plastic phase at 360.8, 272.9, and 328.8 K; only 2 exhibited a plastic phase below 300 K. Moreover, the crystal structures of the plastic phases and low temperature phases were investigated. The results were discussed and compared with the corresponding CF3BF3 salts.Graphical abstract

Source: Journal of Organometallic Chemistry - May 24, 2019 Category: Chemistry Source Type: research