Supramolecular Influences on Metal Ion Coordination: Lead(II) under Eight-coordination
- 1 July 2003
- journal article
- other
- Published by Taylor & Francis in Supramolecular Chemistry
- Vol. 15 (5) , 367-373
- https://doi.org/10.1080/1061027031000104897
Abstract
Crystal structure determinations on the “acid salt” of Pb(II) and dipicolinic acid (pyridine-2,6-dicarboxylic acid, dipicH2), regarded as composed of dimer entities, [Pb2(dipic)2(dipicH2)2(OH2)6], 1, infinitely cross-linked, and on the complex of 2,4-dinitrophenol (2,4-DNPH), a simpler coordination polymer, [Pb(2,4-DNP)2]n, 2, show both solid state structures to be influenced by π-stacking of the ligands. Although the Pb(II) coordination environment in 1 can be regarded as “hemidirected” and that in 2 as “holodirected”, it is argued that inter-dimer stacking interactions, rather than lone pair effects, are responsible for the distorted 9-coordination of Pb in 1. In 2, Pb adopts close-to-cubic 8-coordination.Keywords
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