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    Molecular organization of discotic mesogenic cis-dichlorobis(3,4,5-trialkoxyphenylisonitrile)platinum (II) complexes on Langmuir and Langmuir-Blodgett films

    Year: 2004

    Journal: Surface Science 550 (2004) 106-118, 20111221

    Authors: Vicente Parra , Teodosio del Cao , Silverio Coco , Maria Luz Rodri­guez-Mandez , Jose Antonio de Saja

    Organizations: a Department of Inorganic Chemistry, E.T.S. Industrial Engineers, University of Valladolid, Paseo del Cauce s/n, 47011 Valladolid, Spain b Department of Condensed Matter Physics, Faculty of Sciences, Prado de la Magdalena s/n, 47005 Valladolid, Spain c Department of Inorganic Chemistry, Faculty of Sciences, Prado de la Magdalena s/n, 47005 Valladolid, Spain

    Langmuir and Langmuir-Blodgett films of a new class of square planar metallomesogens, the cis-dichlorobis(3,4,5-trialkoxyphenylisonitrile)platinum (II) complexes (PtCn), have been prepared. The structure and the stability of the floating monolayers of these discotic complexes have been investigated by means of compression isotherms, surface potential measurements and Brewster angle microscopy (BAM). A certain influence of the peripheral substituents on the properties of the Langmuir .lms are observed. It is shown that the hexoxy derivative (PtC6), which shows mesogenic behavior at room temperature, has a more marked tendency to self-organization in ordered multilayers than the butoxy complex (PtC4) which is not liquid crystalline at room temperature. The structural properties of .lms, transferred at di.erent pressures, have been studied by AFM and UV-VIS, FT-IR transmission and reflection-absorption infrared spectroscopy (RAIRS). The transfer of the monolayers onto solid substrates leads to Langmuir-Blodgett .lms in which face-on orientation is found for the molecule cores. The organization of the aliphatic chains depends on the pressure at which the monolayers are transferred.