The role of hydrogen bonding on supramolecular assembly of the mercury coordination compounds and final structure influenced by solvent effect

• Discrete solvatomorphic complexes, metallomacrocycle, and 1D CPs are obtained.
• 2D FPs of the halomercury(II) compounds are dominated by H⋯Hal ‘wings’.
• 2D FPs indicate dominating participation of dispersive contacts in all complexes.
• Shape index and dnorm-mapped HS of obtained adducts are visualized and analyzed.

In this study, mercury(II) compounds of composition [Hg(HL)(I)2]·CH3OH (1), [Hg(HL)(I)2]·CH3CH2OH (2), [Hg2(HL)(μ-I)I3·CH3CN]n (3), [Hg4(HL)2(μ-I)2I6] (4), [Hg2(L)I2]n (5) and [Hg(HL)Br2] (6) (HL = 2-pyridinecarbaldehyde nicotinoyl hydrazone) are described. Depending on the nature of the solvent, from mercury(II) iodide and HL were obtained: discrete solvatomorphic complexes 1 and 2, metallomacrocycle 4 and 1D coordination polymers 3 and 5. Mercury(II) bromide provided exclusively monomeric compound 6. In this work, we took an advantage of the Hirshfeld surface analysis and analyzed both qualitatively and quantitatively interactions governing supramolecular organization of presented halomercury(II) complexes. A special effort has been put on determination of interactions between complex molecules as well as on the role of solvent on the resulting structure. Analysis of 2D fingerprint plots has shown, among others, characteristic point patterns resulting from significant amount of dispersive Hal⋯H contacts.

Synthesis, structural characterization and Hirshfeld analysis studies of six mercury(II) compounds with varied monomeric, dimeric and 1D chain structures have been described.Figure optionsDownload as PowerPoint slide