Mesomorphic behaviour and TSDC measurements of ortho-metallated palladium(II) and platinum(II) complexes with S,O-donor co-ligands |
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| Authors: | Viorel Cîrcu Doina Mănăilă-Maximean Constantin Roşu Monica Iliş Yann Molard Florea Dumitraşcu |
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| Affiliation: | 1. Inorganic Chemistry Department , University of Bucharest , 23 Dumbrava Rosie st., 020464, Bucharest, sector 2, Romania viorel_carcu@yahoo.com;3. Physics Department II , University “Politehnica Bucuresti” , Splaiul Independentei 313, Bucharest, 060042, Romania;4. Inorganic Chemistry Department , University of Bucharest , 23 Dumbrava Rosie st., 020464, Bucharest, sector 2, Romania;5. Sciences Chimiques de Rennes UMR 6226 CNRS Université de Rennes 1, Avenue du Général Leclerc , 35042, Rennes Cedex, France;6. Centre of Organic Chemistry “C.D. Nenitzescu” , Romanian Academy , Splaiul Independentei 202B, Bucharest, 060023, Romania |
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| Abstract: | A series of ortho-metallated Pd and Pt complexes containing an imine ligand carrying three alkoxy chains and N-benzoylthiourea derivatives as co-ligands were prepared and their liquid crystalline properties investigated. Their structures were assigned based on elemental analysis, IR and 1H NMR spectroscopy, whereas thermal properties were investigated by differential scanning calotimetry and polarising optical microscopy. All the compounds exhibit monotropic transitions involving nematic and smectic A phases, with the mesomorphic behaviour strongly related to the type of N-benzoylthiourea as well as the metal centre used. The thermally stimulated depolarisation current technique was employed to determine the conduction mechanism, phase transition temperature and the activation energies for one of the ortho-metallated Pd complexes. |
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| Keywords: | palladium complex platinum complex ortho-metallation N-benzoylthiourea derivative TSDC |
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