Ferrocenophane‐containing (Fcph) Schiff's bases p‐C12H25O(C6H4)CH=N(C6H4)Fcph (LAH) and p‐C12H25O(C6H4)COO(C6H4)CH=N(C6H4)Fcph (LBH) react with palladium(II) acetate to form μ‐acetato‐ and chloro‐bridged dimeric organopalladium complexes. By exchanging acetato‐groups with the chloride anions, μ‐chloro‐bridged heteropolynuclear dimers are obtained that show thermotropic smectic A phases over a temperature range of 198 to 260 °C. The complexes [PdClLA]2 and [PdClLB]2 can be transformed into a variety of mixed‐ligand PdII complexes by treatment with salicylaldimine p‐C12H25O(C6H4)COO(C6H3)(OH)CH=N(C6H4)Fcph (LCH) and β‐aminovinyl ketone p‐C12H25O(C6H4)COCH=CHNH(C6H4)Fcph (LDH). The obtained mixed‐ligand heterometallic complexes [PdLALC], [PdLBLC], [PdLALD] and [PdLBLD] exhibit enantiotropic, thermotropic nematic phases over a broad temperature range from 71 to 205 °C. The structures of the synthesized compounds were characterized by means of 1H NMR, IR and UV spectroscopy, as well as elemental analysis. The liquid crystalline properties were studied by polarising optical microscopy and DSC. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)
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Kadkin et al. (2008) studied this question.
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