Liquid-crystalline coordination polymers based on tetra(alkoxybenzoato)dirhodium(II) complexes axially linked by tetrazine, phenazine and 4,4′-bipyridine
Leonardo Rossi
Cristián Huck-Iriart
María Ana Castro
Fabio D. Cukiernik
10.6084/m9.figshare.5589901
https://tandf.figshare.com/articles/journal_contribution/Liquid-crystalline_coordination_polymers_based_on_tetra_alkoxybenzoato_dirhodium_II_complexes_axially_linked_by_tetrazine_phenazine_and_4_4_-bipyridine/5589901
<p>The reaction of dirhodium tetrakis(3,4,5-trialkoxy)benzoates Rh<sub>2</sub>(B3OC<i>n</i>)<sub>4</sub> (<i>n</i> = 10, 14, and 18) with three different dinitrogenated axial ligands (L<sub>ax</sub>), namely tetrazine (tz), phenazine (phz), and 4,4′-bipyridine (bpy), gave rise to three homologous series of mesogenic coordination polymers, [Rh<sub>2</sub>(B3OC<i>n</i>)<sub>4</sub>]L<sub>ax</sub>. All of them exhibited thermotropic columnar mesophases that were of the hexagonal type for tz and phz and rectangular for bpy. The lighter <i>n</i> = 10 homologs of the three series are liquid crystals (LC) at room temperature. Their mesomorphic properties have been compared with those of the previously studied L<sub>ax</sub> = pyrazine series. Models for the supramolecular organization of the three polymeric series in their Col LC phases are proposed on the basis of their structural parameters, as measured by XRD and SAXS. The differences are interpreted in terms of different coordination features of the axial ligands.</p>
2017-11-23 09:23:30
Coordination polymers
nitrogenated axial ligands
bimetallic carboxylates
metal-metal bond
metallomesogens
columnar mesophases
structural models