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Phase diagrams and optical properties of binary liquid crystalline systems of cobalt (II) caprylate with lithium and lead caplylates
YKI – Ytkemiska institutet.
2011 (English)In: Journal of Non-Crystalline Solids, ISSN 0022-3093, E-ISSN 1873-4812, Vol. 357, no 16-17, 3053-3057 p.Article in journal (Refereed)
Abstract [en]

The concentration and temperature ranges of liquid crystal and glass formation in binary systems of cobalt (II) caprylate with either lithium or lead caplylates have been studied by differential thermal analysis and optical polarization microscopy. Absorption spectra of Co(II) cations in mesophases and glasses of these binary caprylate systems have been analyzed as a function of temperature and composition to get information on the coordination of Co(II) ions. For the binary system of lead-cobalt caprylate. we found that the Co(II) ions are octahedrally coordinated over the range of temperatures and compositions studied, whereas in the binary lithium-lead caprylate system. the Co(II) ions can exist in both octahedral and tetrahedral coordination depending on composition and temperature. Thermochromic behavior was observed for all compositions studied here, from blue to violet and pink, depending on the composition and temperature of the system studied. An unusual increase of optical density with decreased Co(II) ion concentration has been observed for the Co-Li caprylate binary system up to 50 mol%. An increasingly ionic Co(II) coordination environment as Li ion concentration increases facilitates a concomitant increase in the proportion of more optically dense tetrahedrally coordinated Co(II) ions.

Place, publisher, year, edition, pages
2011. Vol. 357, no 16-17, 3053-3057 p.
Keyword [en]
Binary liquid crystal, Cobalt caprylate, Optical properties, Phase diagram
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-27039DOI: 10.1016/j.jnoncrysol.2011.02.047OAI: oai:DiVA.org:ri-27039DiVA: diva2:1054043
Note
A3013Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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