205041-10-7Relevant articles and documents
Mesomorphic cyclometalated (cclopentadienyl)palladium and -platinum complexes
Ghedini, Mauro,Neve, Francesco,Pucci, Daniela
, p. 501 - 504 (2007/10/03)
The mesogenic 4,4′-bis[4-(n-octyloxy)benzoyloxy]azobenzene (HL) ligand reacts with [(PhCN)2PdCl2] to give the dinuclear cyclometalated complex [(μ-Cl)(L)Pd]2 (1), from which the mononuclear half-sandwich [(η5-C5H5)(L)Pd] (2) species has been obtained by reaction with Tl(C5H5). The PtII analogue of 2, [(η5-C5H5)(L)Pt] (4), has been prepared in a similar manner starting from [(μ-Cl)(L)Pt]2 (3), Both dinuclear complexes 1 and 3 display a smectic C phase (Sc) stable over 80°C. Whereas 4 is the first example of an 18-electron PtII mesogen, both mononuclear 2 and 4 are mesomorphic materials that exhibit a nematic phase spanning a wide temperature range.