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- W2106174356 abstract "The synthesis, crystal structure, and properties of novel ternary inclusion compounds formed by the insertion of protonated bis(quinuclidine) guests into urea–bromide and urea–iodide anionic hosts are reported. (Urea2[quinuclidine2H]+Br−), 1, and (urea2[quinuclidine2H]+I−), 2, are monoclinic, space group C2. The cell parameters for 1 are a= 19.323(8), b= 7.145(3), c= 8.566(4), β= 112.19(3), dcalc= 1.284 and Z= 4, considering 472 reflections; for 2 they are a= 20.51(11), b= 7.34(3), c= 8.17(4), β= 111.81(8), dcalc= 1.369, Z= 4, considering 716 reflections. In the two structures each urea molecule interacts with adjacent urea molecules via N–H⋯O hydrogen bonds forming a ribbon-like arrangement. The ribbons are linked through halide ions by N–H⋯X hydrogen bonds forming layered structures. The distances between the layers are 10.301 A for 1 and 8.566 A for 2. The compounds may be described as commensurate species. Conductivity values determined for 1 and 2 at room temperature are 1.19 × 10−5 and 8.66 × 10−7(Ω cm)−1, and they increase with temperature. Aspects of the thermal stability of the products are discussed." @default.
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- W2106174356 date "2002-01-01" @default.
- W2106174356 modified "2023-09-27" @default.
- W2106174356 title "Protonated bis(quinuclidine) included in layered bis(urea)–bromide and -iodide hosts: new ternary urea inclusion compounds" @default.
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- W2106174356 doi "https://doi.org/10.1039/b201053b" @default.
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