Journal
CHEMICAL PHYSICS
Volume 368, Issue 1-2, Pages 14-19Publisher
ELSEVIER
DOI: 10.1016/j.chemphys.2009.12.003
Keywords
Electron structure; Coordination compounds; Geometry optimization; Lead(II) lone electron pair
Funding
- Slovak Grant Agency [1/0127/09]
- Centre of Excellence Programme of the Slovak Academy of Science in Bratislava, Slovakia [II/1/2007]
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In order to explain the difference between high-symmetric holodirected and less-symmetric hemidirected Pb(II) compounds, the structures of [PbF4](2), [PbCl4](2) and [Pb(OH)(4)](2) have been optimized without any symmetry restrictions and/or within various symmetry groups using all-electron relativistic B3LYP treatment and alternatively using B3LYP and MP2 treatments with effective core potential for Pb atoms. Optimal geometries of both [PbF4](2) and [PbCl4](2) are of T-d symmetry (holodirected structures). The [Pb(OH)(4)](2) optimal geometry of C-2 symmetry cannot be explained by pseudo-Jahn-Teller effect due to energy and symmetry reasons. The less-symmetric geometry of tetracoordinated Pb(II) complexes with non-halogen ligands may be explained by the mutual interactions of their less-symmetric ligands. This symmetry decrease is subsequently supported by the increasing p electrons content in the Pb(II) lone electron pair via influencing the hybridization scheme of the Pb-ligands bond orbitals (i.e. not due to the repulsion between the ligands and the Pb(II) lone electron pair). (C) 2009 Elsevier B. V. All rights reserved.
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