Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας
The asymmetric unit of the title compound, C44H30O2, contains two independent mol-ecules in which the terminal rings of the terphenyl element are inclined at angles of 36.3"…(1) and 22.5"…(1)Β° with respect to the central ring and the dihedral angles between the fluorenyl units are 72.3"…(1) and 62.8"…(1)Β°. In the crystal, pairs of O-Hβ‹―O hydrogen bonds link the mol-ecules into inversion dimers. The hy-droxy H atoms not involved in these hydrogen bonds form O-Hβ‹―Ο€ inter-actions in which the central terphenyl rings act as acceptors. Weak C-Hβ‹―O contacts and Ο€-Ο€ [centroid-centroid distance = 4.088"…(2)"…Γ…] stacking inter-actions also occur. Taking into account directed non-covalent bonding between the molecules, the crystal is constructed of supramolecular strands extending along the a-axis direction.