Two-Dimensional Holo- and Hemidirected Lead(II) Coordination Polymers: Synthetic, Spectroscopic, Thermal, and Structural Studies of [Pb(μ-SCN)2(μ-ebp)1.5]n and {[Pb(μ-OAc)(μ-ebp)](ClO4)}n (ebp=4,4′-[(1E)-Ethane-1,2-diyl]bis[pyridine]; OAc=Acetato)
✍ Scribed by Ali Morsali; Veysel T. Yilmaz; Canan Kazak; Long-Guan Zhu
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- German
- Weight
- 218 KB
- Volume
- 88
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
Abstract
Two new coordination polymers of Pb^II^ complexes with bridging 4,4′‐[(1__E__)‐ethane‐1,2‐diyl]bis[pyridine] (ebp), thiocyanato, and acetato ligands, [Pb(μ‐SCN)~2~(μ‐ebp)~1.5~]~n~ (1) and {Pb(μ‐OAc)(μ‐ebp)}~n~ (2), were synthesized and characterized by elemental analysis, FT‐IR, ^1^H‐ and ^13^C‐NMR, thermal analysis, and single‐crystal X‐ray diffraction. In 1, the Pb^2+^ ions are doubly bridged by both the ebp and the SCN^−^ ligands into a two‐dimensional polymeric network. The seven‐coordinate geometry around the Pb^2+^ ion in 1 is a distorted monocapped trigonal prism, in which the Pb^2+^ ions have a less‐common holodirected geometry. In 2, the Pb^2+^ ions are bridged by AcO^−^ ligands forming linear chains, which are also further bridged by the neutral ebp ligands into a two‐dimensional polymeric framework. The Pb^2+^ ions have a five‐coordinate geometry with two N‐atoms from two ebp ligands and three O‐atoms of AcO^−^. Although ClO$\rm{_{4}^{-}}$ acts as a counter‐ion, it also makes weak interactions with the Pb^2+^ center. The arrangement of the ligands in 2 exhibits hemidirected geometry, and the coordination gap around the Pb^2+^ ion is possibly occupied by a configurationally active lone pair of electrons.