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Synthesis and Liquid-Crystalline Properties of Diazabutadiene Complexes of Rhenium(I)

1996; American Chemical Society; Volume: 35; Issue: 24 Linguagem: Inglês

10.1021/ic960478x

1520-510X

Stefania Morrone, Daniel Guillon, Duncan W. Bruce,

Radioactive element chemistry and processing

New N,N '-bis(4-((4-alkoxybenzoyl)oxy)phenyl)-1,4-diaza-1,3-butadiene (L) ligands, obtained by condensation of 4-((alkoxybenzoyl)oxy)anilines and glyoxal, were complexed to different [ReX(CO)3] fragments to give the complexes [ReX(L)(CO)3] (X = Cl, Br, I) and [Re(CF3SO3)(L)(CO)3]·THF. The chloro and bromo complexes were obtained by direct reaction of the ligands with [ReX(CO)5] (X = Cl, Br), while the iodo and triflato derivatives were obtained via metathesis of the chloro or bromo precursors with potassium iodide or silver triflate respectively. The liquid-crystalline behavior of the ligands and the related rhenium complexes has been studied by means of optical microscopy, differential scanning calorimetry, and small angle X-ray diffraction. Nematic and smectic C phases were observed when the coordinated counteranions were Cl, Br, and I, respectively; the triflato derivatives were not mesomorphic.