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Ringstrand, Bryan; Jankowiak, Aleksandra; Johnson, Lillian E; Kaszynski, Piotr; Pociecha, Damian; Grecka, Ewa
02/2012, Letnik: 22, Številka: 11Journal Article
A series of structurally analogous esters derived from monocarbaborates, closo -1-CB 9 H 10 ( A ) and closo -1-CB 11 H 12 ( B ), containing a maximum of 4 rings in the rigid core were prepared and investigated by thermal, optical, and XRD methods. Ion pairs containing a total of 4 rings with either N -butyl-4-heptyloxypyridinium ( Pyr ) or cetyltrimethylammonium ( Cetyl ) cation form a SmA phase ranging from 90 C to 229 C. Ion pairs 1ePyr and 2ePyr containing an azo group in the anisometric anion exhibit an enantiotropic nematic phase above the SmA phase. The cesium salt 1hCs did not exhibit mesogenic behavior. Partial binary phase diagrams were investigated for 1dPyr and 2dPyr in 2ePyr , and for 1fPyr in non-ionic mesogens. Variable temperature powder XRD analysis of 5 ionic liquid crystals, 1ePyr , 1fPyr , 2fPyr , 1gPyr , and 2gPyr , demonstrated about 20% interdigitation in the SmA phase and provided thermal expansion coefficients. Ion pairs of anisometric anions derived from the closo -1-CB 9 H 10 and closo -1-CB 11 H 12 clusters exhibit SmA, nematic, and soft crystalline phases
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