Abstract
We report the synthesis and X-ray characterization of four new Pb(ii) complexes of nicotinoylhydrazone and picolinoylhydrazone-based ligands and three different anionic co-ligands (acetate, thiocyanate and iodide) exhibiting relevant tetrel bonding interactions.
Highlights
Hydrogen bonding interactions are the most commonly used force for the construction and/or modification of metal–organic frameworks (MOFs)
We have reported the design and synthesis of leadIJII) supramolecular metal–organic frameworks (SMOFs) based on covalent and non-covalent tetrel bonding interactions.[9]
A combined DFT study and a statistical survey of the Cambridge Structural Database (CSD) revealed that tetrel bonds with a hemidirectionally coordinated lead center occur with high probability and with predictable geometries, playing an important role in the solid-state chemistry of lead.9a we have shown that concurrent non-covalent tetrel bonding, agostic interactions and chelate ring–chelate ring stacking interactions control the supramolecular architectures and organometallic frameworks observed in the solid state architecture of hemidirectionally coordinated PbX2 salts (X = Cl, NO2, I and SCN) to the N′-(phenylIJpyridin-2-yl)methylene)isonicotinohydrazide ligand.[10]
Summary
Hydrogen bonding interactions are the most commonly used force for the construction and/or modification of MOFs. other specific non-covalent interactions like highly directional halogen bonding interactions are becoming prominent players in this field.[6] In addition to halogen atoms, electron-deficient regions are present in covalently bonded heavier atoms of groups IV to VII, which are located at the extension of the covalent bond.[7] The size and positive electrostatic potential at the σ-holes increase with the increasing electron-withdrawing nature of the covalently bonded group and with the polarizability of the atom on which the σ-hole is formed. The strongest σ-hole interactions occur in those complexes where a heavy atom of groups IV to VII is covalently bonded to electronegative ones. This type of σ-hole interaction has been widely
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