Crystal structure of tris[(2.2.2-cryptand)× (nitrato-O,O′)lead(II)] pentakis(nitrato-O,O′)lead(II) |
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Authors: | A N Chekhlov |
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Institution: | (1) Institute of Problems of Chemical Physics, Chernogolovka |
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Abstract: | A novel coordination compound tris(2.2.2-cryptand)(nitrato-O,O′)lead(II)] pentakis(nitrato-O, O′)lead(II), 3Pb(NO3)(Crypt-222)]+·Pb(NO3)5]3? (I) has been prepared and studied by the single crystal X-ray diffraction technique. The crystals of I are monoclinic: space group Pc, a = 25.944 Å, b = 18.389 Å, c = 17.145 Å, β = 93.33°, Z = 4. The structure of I has been solved by the direct and heavy atom methods and refined in a full-matrix anisotropic-isotropic approximation to R = 0.122 for the total of 11145 measured reflections (automated diffractometer CAD-4, λMoK α). The structure of I includes six independent host-guest complex cations Pb(NO3)(Crypt-222)]+ and two independent complex anions Pb(NO3)5]3?. Coordination number of the cation Pb2+ equals ten in all these complex ions, and its coordination polyhedron in the first of them is a strongly distorted “hexagonal bipyramid” with two forked vertices, while for the latter ones it is a strongly distorted “square pyramid” with all five vertices forked. |
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Keywords: | single crystal X-ray diffraction analysis guest-host complexes of 2 2 2-cryptand and lead(II) nitrate |
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