Abstract
A new three-dimensional polymeric Pb II complex, [Pb 3(bpy)(H 2O) 5(sip) 2] n ·0.5bpy·2H 2O (bpy = 2,2′-bipyridine and sip = 5-sulfoisophethalate), has been synthesized and characterized. Its single-crystal X-ray structure shows three types of Pb 2+-ions with coordination numbers of 8 Pb1, 6 Pb2, and 7 Pb3. The Pb1 center with a coordination number of 8 possesses a stereo-chemically ‘inactive’ electron lone pair, and the coordination sphere is holodirected. However, the arrangement of O- and N-atoms for Pb2 and Pb3 suggests a gap or hole in the coordination geometry around these atoms. The stereo-chemically ‘active’ electron lone pairs of Pb2 and Pb3 possibly occupy these ‘holes’, and their coordination spheres are, thus, hemidirected.
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