On construction of lead coordination polymers derived from N′-(2-hydroxybenzylidene)nicotinohydrazide via covalent and non-covalent interactions

Synthesis, Crystal Structure, and Hirshfeld Surface Analysis of Hexachloroplatinate and Tetraclorouranylate of 3-Carboxypyridinium—Halogen Bonds and π-Interactions vs. Hydrogen Bonds

This work aimed to synthesize new platinum and uranium compounds with nicotinic acid. In this article we describe the synthesis of two new anionic complexes (HNic)2[PtCl6] and (HNic)2[UO2Cl4] using wet chemistry methods. The structure of the obtained single crystals was established by single-crystal X-ray diffraction. The Hirshfeld surface analysis of the obtained complexes and their analogue (HNic)2[SiF6] was carried out for the analysis of intermolecular interactions. Hydrogen bonds (H···Hal/Hal···H and O···H/H···O) make the main contribution to intermolecular interactions in all compounds. Other important contacts in cations in all compounds are H···H, C···H/H···C and C···Hal/Hal···C; in anions H···Hal/Hal···H. The Pt-containing complex has a halogen-π interaction and halogen bonds, but Si-containing complex has a π–π staking interaction; these types of interactions are not observed in the U-containing compound.

Intermolecular Pb...N interactions in lead(II) dimers producing a supramolecular two-dimensional metal–organic compound: bis[μ2-N′-(2-oxidobenzylidene)benzohydrazidato-κ4O:O,N′,O′]dilead(II)

Aroylhydrazones ofortho-hydroxy aldehydes are Schiff base ligands that typically coordinate as a chelate in anO,N,O′-manner. Dinuclear complexes are normally observed, with the phenolate O atom acting as the bridging atom. The switchable protonation state of the tridentateN′-(2-hydroxybenzylidene)benzohydrazide (H2sabhz) ligand can lead to variations in the resulting supramolecular structure. The title compound, [Pb2(C14H10N2O2)2], was prepared by the reaction of [Pb(OAc)2]·3H2O (OAc is acetate) with the benzoylhydrazone derivative of salicylaldehyde,i.e.H2sabhz, in the presence of triethylamine in methanol. In the crystal structure, each PbIIatom of the dimer has an NO3coordination environment, with one sabhz ligand coordinating in anO,N,O′-manner and with the second sabhz ligand coordinatingviathe bridging phenolate O atom, since the dimers are located on a centre of inversion. It has been found that the dimers are connected by Pb...N interactions, resulting in a two-dimensional supramolecular network which shows the [32.52,3.53] net topology. Thes2electron pair of the PbIIion clearly influences the observed intermolecular interactions.