In thiswork the synthesis of a series of Ni(II), vanadyl and Pd(II) metallomesogen complexeswith a chiral ligand is reported. Cholesteric mixtureswere obtained by mixing such complexeswith analogous achiral complexes and their thermotropic behavior was studied by means of differential scanning calorimetry, temperature dependent UV–Visible spectroscopy and optical observation. The results show a strong dependence of the cholesteric pitch on the temperature for Ni/Ni mixtures, minor and no dependence respectively for VO/VO and Pd/Pd mixtures, this last in accordance with the known behavior of Cu/Cu mixtures. The study reveals an influence of the metal and its coordination geometry on the temperature dependence of the cholesteric pitch.

Synthesis and thermotropic behaviour of cholesteric mixtures containing metallomesogen Cu(II), Ni(II), Pd(II) and VO(II) complexes

ROVIELLO, Giuseppina;
2013

Abstract

In thiswork the synthesis of a series of Ni(II), vanadyl and Pd(II) metallomesogen complexeswith a chiral ligand is reported. Cholesteric mixtureswere obtained by mixing such complexeswith analogous achiral complexes and their thermotropic behavior was studied by means of differential scanning calorimetry, temperature dependent UV–Visible spectroscopy and optical observation. The results show a strong dependence of the cholesteric pitch on the temperature for Ni/Ni mixtures, minor and no dependence respectively for VO/VO and Pd/Pd mixtures, this last in accordance with the known behavior of Cu/Cu mixtures. The study reveals an influence of the metal and its coordination geometry on the temperature dependence of the cholesteric pitch.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11367/24299
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