Author:
Harvey S,Kildea JD,Skelton BW,White AH
Abstract
Whereas recrystallization of CuIClO4 from the progressively bulky pyridine bases (L) pyridine ( py ), 2-methylpyridine (2-mpy) and 2,6-dimethylpyridine (2,6-dmpy) yields adducts of progressively diminishing base stoichiometry , n = 4, 3, 2 (in [CuLn ](ClO4)), recrystallization of LiClO4 from the same bases yields adducts [Li( py )4](ClO4) and polymeric, perchlorate -bridged Li(2-mpy/2,6-dmpy)2 ClO4). The former is tetragonal, I4 a 12.479(5), c 7.009(8) � , Z 2, and isomorphous with the copper analogue; R was 0.057 for 324 'observed' reflections, and Li-N 2.O66(7)�
[cf. Cu-N, 2.046(4) � ]. Li(2-mpy)2(ClO4) is monoclinic, P21/c, a 16.004(4), b 10.020(3), c 8.831(5) �, β 99.56(3), Z 4, R 0.047 for 1402 'observed' reflections, while Li(2,6-dmpy)2(ClO4) is monoclinic, C2/c, a 22.089(9), b 10.067(5), c 15.715(6) � , β 110.54(3), Z 8, R 0.041 for 1991 'observed' reflections. The latter compounds have Li2N2O2 coordination environments about the metal of an irregular nature, presumably in consequence of ligand hindrance.
Cited by
7 articles.
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