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Polar (m z 16 D) and UV transparent >250 nm quinuclidinium (1) and sulfonium (2) zwitterionic derivatives of the [closo-1-CB 9 H 10 ] À anion were synthesized and studied as additives to nematic hosts. The molecular and crystal structures for 1 [C 19 H 44 B 9 N triclinic, P-1, (10) , g ¼102.587(10) , Z ¼ 2] were determined by X-ray crystallography and compared with the results of HF/6-31G(d) calculations. Low concentration solutions (<10 mol%) of 1 and 2 in ClEster host (D3 ¼ À0.59) weredoi:10.1039/b913701g fatcat:lwtc24pfjzf75b226dta4jvljm