Synthesis and crystal structures of two new lead(II) complexes with the pincer-type ligand 4′-(4-chlorophenyl)-2,2′:6′,2″-terpyridine (Cl-Ph-tpy): subtle interplay of weak intermolecular interactions

Marandi, Farzin; Krautscheid, Harald

Synthesis and crystal structures of two new lead(II) complexes with the pincer-type ligand 4′-(4-chlorophenyl)-2,2′:6′,2″-terpyridine (Cl-Ph-tpy): subtle interplay of weak intermolecular interactions

2020

Marandi, Farzin | Krautscheid, Harald

A dinuclear and a tetranuclear complex of lead(II) with the pincer-type ligand 4′-(4-chlorophenyl)-2,2′:6′,2″-terpyridine (Cl-Ph-tpy), [Pb₂(Cl-Ph-tpy)₂(μ-I)₂I₂] (1) and [Pb₄(Cl-Ph-tpy)₄(μ-Br)₄(μ-OH₂)Br₄]·2CH₃OH (2), have been synthesized and characterized by elemental analysis, FT-IR and ¹H NMR spectroscopy, and by single-crystal X-ray diffraction. In the binuclear structure of 1, the Pb atom has a hemidirected PbN₃I₃ environment with a Pb(μ-I)₂Pb central unit. In the tetranuclear structure of 2, two crystallographically independent Pb(II) centres having hemidirected PbN₃Br₃ and PbN₃OBr₂ environments are connected to Pb(μ-Br)Pb(μ-Br)₂(μ-OH₂)Pb(μ-Br)Pb chains. The supramolecular features in 1 and 2 are supported through weak but directional C–H···Cl, C–H···I and C–H···Br, C–H···O, O–H···Br, and O···Br interactions and aromatic π-π stacking.

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