title: Synthesis, characterization, and tuning of the liquid crystal properties of ionic materials based on the cyclic polyoxothiometalate [{Mo4O4S4(H2O)3(OH)2}2(P8W48O184)](36-).
abstract: A series of compounds resulting from the ionic association of a nanoscopic inorganic cluster of formula [K2NaxLiy{Mo4O4S4(OH)2(H2O)3}2(HzP8W48O184)]((34-x-y-z)-), 1, with several organic cations such as dimethyldioctadecylammonium DODA(+), trimethylhexadecylammonium TMAC16(+), alkylmethylimidazoliums mimCn(+) (n = 12-20) and alkyl-dimethylimidazoliums dmimCn(+) (n = 12 and 16) was prepared and characterized in the solid state by FT-IR, EDX, Elemental analysis, TGA and solid state NMR. The solid state NMR experiments performed on (1)H, (13)C and (31)P nuclei evidenced the interactions between the cations and 1 as well as the organization of the alkyl chains of the cations within the solid. Polarized optical microscopy, DSC and SA-XRD experiments implicated mesomorphic phases for DODA(+) and mimCn(+) salts of 1. The crystallographic parameters were determined and demonstrated that the inter-lamellar spacing could be controlled upon changing the length of the alkyl chain, a very interesting result if we consider the huge size of the inorganic cluster 1 and the simple nature of the cations.
authors.affiliation: Institut Lavoisier de Versailles, UMR 8180, University of Versailles, 45 Avenue des Etats-Unis, 78035 Versailles, France. sebastien.floquet@uvsq.fr mohamed.haouas@uvsq.fr.
authors.forename: Nancy
authors.initials: N
authors.lastname: Watfa
authors.forename: Sébastien
authors.initials: S
authors.lastname: Floquet
authors.forename: Emmanuel
authors.initials: E
authors.lastname: Terazzi
authors.forename: Mohamed
authors.initials: M
authors.lastname: Haouas
authors.forename: William
authors.initials: W
authors.lastname: Salomon
authors.forename: Vladimir S
authors.initials: VS
authors.lastname: Korenev
authors.forename: Francis
authors.initials: F
authors.lastname: Taulelle
authors.forename: Laure
authors.initials: L
authors.lastname: Guénée
authors.forename: Akram
authors.initials: A
authors.lastname: Hijazi
authors.forename: Daoud
authors.initials: D
authors.lastname: Naoufal
authors.forename: Claude
authors.initials: C
authors.lastname: Piguet
authors.forename: Emmanuel
authors.initials: E
authors.lastname: Cadot