Abstract
Square-planar rhodium or iridium “n-decyloxy-β-diketonate” complexes of the general formula [M(β-diketonate)(CO)2] (M = Rh (1−3) or Ir (4−6)) and pyrazole−rhodium derivatives of the type [RhCl(CO)2(pyrazole)] (7−9) have been prepared and their liquid-crystalline properties studied. Compounds 1 and 4 show monotropic smectic A phases, and complex 7 shows a monotropic nematic phase. The behavior of the melting points seems to be related to the X group directly bonded at the 3-position of the β-diketonate ligand (1−6) or at the 4-position of the pyrazole ring (7−9). When X = OOC higher melting points are obtained. Two different polymorphs, red (M = Rh) or blue (M = Ir) and yellow (M = Rh, Ir), have been obtained for complexes 1, 4, and 6. The yellow form for compound 4 (C31H35IrO9·CH3OH, monoclinic system, space group P21/c (No. 14) with a = 26.991(6) A, b = 4.0093(8) A, c = 31.169(6) A, β = 104.950(13)°, and Z = 4) has also been characterized by an X-ray single-crystal diffraction experiment in order to expl...
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