Browsing by Author "Valdebenito, N"

Now showing 1 - 3 of 3
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    Liquid crystalline polymers containing discotic metallomesogens in the main chain
    (2000) Valdebenito, N; Oriol, L; Barberá, J; Díaz, F; Serrano, JL
    Metallomesogenic polymers having discotic units in the main chain have been synthesized using beta -diketonates of Cu(II) and Pd(II) as monomers. The corresponding homologues of low molecular weight have also been synthesized as models of the polymers. All the materials prepared exhibit columnar mesophases. The model compounds exhibit a columnar hexagonal mesophase. In the case of the polymers, the more flexible polymers 2a and 2b show a columnar hexagonal mesophase whereas the more rigid polymers la and Ib exhibit a columnar rectangular mesophase. Fibers of these polymers have an orientation of the polymeric chains along the stretching direction and the disk-like units ate arranged in columns perpendicular to the fiber axis.
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    Poly(p-phenylene-diselenocarbonate) and poly(p-phenylene-diselenothiocarbonate): New semiconducting polymers
    (1996) Diaz, FR; Godoy, A; Tagle, LH; Valdebenito, N; Bernede, JC
    New polymers which contain selenium in the main chain have been synthesized. Poly(p-phenylene-diselenocarbonate) and poly(p-phenylene-diselenothiocarbonate) have been studied by X-ray photoelectron spectroscopy (XPS). Electrical conductivity was measured on samples without dopant agent and on samples doped with AlCl3, FeCl3, SbF5 and I-2. The morphology of these compounds was studied using a scanning electron microscope (SEM). Copyright (C) 1996 Elsevier Science Ltd
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    Smectic Cu(II), Pd(II) and VO(IV) complexes: Synthesis, EPR and thermogravimetric studies
    (TAYLOR & FRANCIS LTD, 1998) Diaz, FR; Valdebenito, N; Serrano, JL; Marcos, M; Martinez, JI; Alonso, PJ
    The octadecanoate of N-(4-hexyloxyphenyl)salicylaldimine and the corresponding Cu(II), Pd(II) and VO(IV) complexes were synthesized and studied. The compounds were characterized by IR, H-1 NMR, elemental and thermal analysis and polarized light microscopy. Thermogravimetric analysis and electronic spectra of the complexes are reported. Electron paramagnetic resonance (EPR) measurements were performed.