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; MARIA ANA CASTRO; FABIO DANIEL CUKIERNIK

Iguazú

Congreso; 6to Simposio Latinoamericano de Química de Coordinación y Organometálica; 2017

The reaction of dirhodium tetrakis(3,4,5-trialkoxy)benzoates Rh2(B3OCn)4 (n = 10, 14 and 18) with three different dinitrogenated axial ligands (Lax), namely tetrazine (tz), phenazine (phz) and 4,4 ́-bipyridine (bpy) gave rise to three homologous series of mesogenic coordination polymers, [Rh2(B3OCn)4]Lax. All of them exhibited thermotropic columnar mesophases that were of the hexagonal type for tz and phz and rectangular for bpy. The lighter n = 10 homologs of the three series are liquid crystals (LC) at room temperature. Comparisons of their mesomorphic properties have been performed both with the bis-capped non-polymeric species [Rh2(B3OCn)4](Lax)2, and the previously studied Lax = 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.