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Studies of Mesomorphic Properties of a Series of Bimetallic Os (III,III) Benzoates and Their Polymeric Axial Pyrazine Adducts

Synthesis, characterization and mesomorphic properties of tetra(alkoxy benzoate)diosminum(III) of the formula Os2(k,l,m-BgOCn)4 (where B is the benzoate group; g is the number of alkoxy chains on the aromatic ring; k, l and m are their positions of attachments; and n is the number of carbon atoms in each alkoxy chain) and their corresponding pyrazine adducts have been carried out. The complexes synthesized are Os2 (3,4,5-B3OCn)4 for n = 2, 10, 16 and 20; Os2(3,4-B2OCn)4 for n = 2, 9, and 14; Os2(3,5-B2OCn)4 for n = 2, 10, 16 and 20; as well as the corresponding adducts[Os2(3,4,5-B3OCn)4px]x for n = 2, 10, 16 and 20; Os2(3,4-B2OCn)4 for n = 2, 9 and 14; Os2(3,5-B2OCn)4 for n = 14, 16 and 19. Full characterization of the compounds were carried out using elemental analyses, 1H NMR and IR. A single crystal X-ray diffraction studies confirmed that the pyrazine adducts prepared via connected metallic centers have a polymeric structure. Diffrential scanning calorimetry (DSC), optical microscopy and XRD studies revealed the liquid-crystalline (LC) properties of most of them as cubic mesophases with melting transition temperatures close or below room temperatures. The mesomorphic character of the pyrazine compounds, compared to the non-mesomorphic aliphatic carboxylate analogues, can be interpreted in terms of the ability of the equatorial ligands to fill the interdimeric space efficiently.