Mesomorphism and Unusual Multiple Melting Behavior via Smectic E Phase inp-n-Alkoxybiphenylbutane-1,3-dione

This is the authors' abstract. We don't add key points for this paper.

4-n-Alkoxy-4′-acetylbiphenyl(C n O-A: 8 ∼ 12, 16, 18) and p-n-alkoxybiphenylbutane-1,3-dione(CnO- Lig: 8 ∼ 12,16, 18) have been synthesized and characterized. The CnO-A (n = 8 ∼ 12, 16) derivatives have a smectic E mesophase. The CnO-Lig(n = 8 ∼ 12, 16, 18) have two mesophases, smectic E and smectic A mesophases. Interestingly, each of the CnO-Lig(n = 8 ∼ 12) compounds has three crystalline polymorphs. The CnO-Lig derivatives for n = 8, 10, and 12 show two types of double melting behavior via the smectic E mesophase. The CnO-Lig derivatives for n = 9 and 11 exhibit triple melting behavior via the smectic E mesophase.