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            <title xml:lang="en">An Ia3̄d thermotropic cubic phase from N-alkylpyridinium tetrahalocuprates</title>
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                <term xml:lang="en">crystal structure</term>
                <term xml:lang="en">acid</term>
                <term xml:lang="en">bromine derivative</term>
                <term xml:lang="en">chlorine derivative</term>
                <term xml:lang="en">copper</term>
                <term xml:lang="en">pyridinium derivative</term>
                <term xml:lang="en">article</term>
                <term xml:lang="en">cooling</term>
                <term xml:lang="en">X ray diffraction</term>
                <term xml:lang="en">topography</term>
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                <term xml:lang="en">smectic phase</term>
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              <p>The thermotropic liquid crystalline behaviour of two N-alkylpyridinium tetrahalocuprates was investigated. The n-pentadecyl tetrachloro and tetrabromo derivatives (CU15-CL and CU15-BR, respectively) exhibit very similar behaviour on cooling, and specifically, a high temperature smectic phase followed by a cubic phase. We fully elucidated the Ia3̄d space group for the cubic phase from X-ray diffraction on single crystals. The type of cubic phase is still under discussion, but we suggest that it is a direct type of structure based on the known phase sequence of lower and higher homologues. A model for the local organization of CU15-CL and CU15-BR in the cubic and smectic mesophases is also proposed.</p>
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