Orientational Order in Nematic and Smectic A Phases of Three Closely Related Compounds 4 4-di-n-Heptylazobenzene 4 4-di-n-Heptyl- and 4 4-di-n-Octylazoxybenzene

Donata Catalano Dipartimento di Chimica, Universita di Pisa, Italy

Claudia Forte Dipartimento di Chimica, Universita di Pisa, Italy

Carlo Alberto Veracini Dipartimento di Chimica, Universita di Pisa, Italy

J. W. Emsley Department of Chemistry, The University, Southampton, SO9 5NH, England

G. N. Shilstone Department of Chemistry, The University, Southampton, SO9 5NH, England

Abstract

The orientational ordering in the three related compounds 4,4-di-n-heptyl-d₂-azobenzene-d, (HB-d₁₂), 4,4′-di-n-heptyl-d₂-azoxybenzene-d, (HAB-d₁₂) and 4,4-di-n-octyl-d₂-azoxybenzene-d₈ (OAB-d₁₂) has been monitored using deuteron N.M.R. spectroscopy. In these non-rigid molecules it is possible to obtain only the elements of local order matrices. For the aromatic rings these are found to be axially symmetric within the precision of our measurements. The temperature dependences of the local order parameters for the aromatic rings are compared with those predicted by McMillan's theory of smectic A phases.

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Orientational Order in Nematic and Smectic A Phases of Three Closely Related Compounds 4 4-di-n-Heptylazobenzene 4 4-di-n-Heptyl- and 4 4-di-n-Octylazoxybenzene

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Orientational Order in Nematic and Smectic A Phases of Three Closely Related Compounds 4 4-di-n-Heptylazobenzene 4 4-di-n-Heptyl- and 4 4-di-n-Octylazoxybenzene

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