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Updated: Jun 1, 2026
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Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents
Published on: May 28, 2014
Bis(imidazo[4,5-f][1,10]phenanthroline)dinitratolead(II)
Summary
This study details a novel lead(II) coordination compound featuring imidazo[4,5-f][1,10]phenanthroline ligands and nitrate ions. The crystal structure reveals intermolecular hydrogen bonds and aromatic π-π stacking, influencing molecular arrangement.
Area of Science:
- Inorganic Chemistry
- Crystallography
- Coordination Chemistry
Background:
- Lead(II) compounds exhibit diverse coordination geometries influenced by stereochemically active lone pairs.
- Imidazo[4,5-f][1,10]phenanthroline (L) is a versatile ligand in coordination chemistry.
- Nitrate ions can act as weakly coordinating ligands in metal complexes.
Purpose of the Study:
- To synthesize and characterize a new lead(II) coordination compound.
- To investigate the crystal structure and intermolecular interactions of the title compound.
- To understand the role of the lone pair on Pb(II) in determining coordination geometry.
Main Methods:
- Single-crystal X-ray diffraction analysis.
- Spectroscopic characterization (e.g., IR, NMR - though not explicitly mentioned, implied for characterization).
- Crystal structure determination and analysis of bonding and packing.
Main Results:
- The Pb(II) atom is hexa-coordinated by four nitrogen atoms from two L ligands and two oxygen atoms from nitrate ions.
- An irregular coordination geometry around Pb(II) is observed, attributed to the stereochemically active lone pair.
- Intermolecular bifurcated N-H⋯(O,O) hydrogen bonds form chains along the [100] direction.
- Aromatic π-π stacking interactions between adjacent chains are significant, with a centroid-centroid distance of 3.483(2) Å.
Conclusions:
- The synthesized compound exhibits a unique coordination environment for Pb(II).
- The crystal packing is governed by a combination of hydrogen bonding and π-π stacking interactions.
- The study provides insights into the structural chemistry of lead(II) complexes with phenanthroline derivatives.
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