Novel Pb(II) Complexes: X-Ray Structures, Hirshfeld Surface Analysis and DFT Calculations

Herein we report the synthesis and detailed structural characterization of two new centrosymmetric dinuclear coordination compounds of Pb(II) [Pb<sub>2</sub>L<sub>2</sub>(NCS)<sub>4</sub>] (<b>1</b>) and [Pb<sub>2</sub>L<sub>2</sub...

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Bibliographic Details
Main Authors: Ghodrat Mahmoudi, Saikat Kumar Seth, Antonio Bauza Riera, Fedor Ivanovich Zubkov, Antonio Frontera
Format: Article
Language:English
Published: MDPI AG 2020-07-01
Series:Crystals
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Online Access:https://www.mdpi.com/2073-4352/10/7/568
Description
Summary:Herein we report the synthesis and detailed structural characterization of two new centrosymmetric dinuclear coordination compounds of Pb(II) [Pb<sub>2</sub>L<sub>2</sub>(NCS)<sub>4</sub>] (<b>1</b>) and [Pb<sub>2</sub>L<sub>2</sub>(NO<sub>3</sub>)<sub>4</sub>]∙2MeOH (<b>2</b>), using the organic ligand 1,2-diphenyl-1,2-bis((methyl(pyridin-2-yl)methylene)hydrazono)ethane (<b>L</b>). In both complexes, each subunit [PbLX<sub>2</sub> (X = NO<sub>3</sub> or NCS)] adopts a quasi-aromatic Möbius metal chelate structure. Each ligand L is coordinated in a tetradentate coordination mode to Pb(II), yielding the 12π electron chelate ring via two pyridyl-imine units. In compound (<b>1</b>), the coordination sphere is completed by one disordered N,S-coordinated thiocyanate anion and two μ<sub>1,1</sub>-bridging N-coordinated thiocyanate anions. In compound (<b>2</b>), the coordination sphere of Pb(II) is completed by two monodentate and two bidentate nitrato ligands (two of them acting as bridging ligands). Crystal packing of both compounds is stabilized by intermolecular hydrogen bonds, intra- and intermolecular C–H∙∙∙π interactions. The Hirshfeld molecular surfaces of (<b>1</b>) and (<b>2</b>) demonstrate that their packing is dominated by C–H∙∙∙O/N/S interactions as well as by far less favored H∙∙∙H contacts.
ISSN:2073-4352