Platinum(II) molecular triangle with a deep intramolecular cavity

Area of Science:

• Coordination Chemistry
• Organometallic Chemistry
• Supramolecular Chemistry

Background:

• The synthesis of novel platinum complexes is crucial for developing new materials and catalysts.
• 1,3-bis(N-pyrazolyl)benzene (bpzphH) is a versatile ligand for constructing coordination compounds.

Purpose of the Study:

• To investigate the reaction products of K2PtCl4 with bpzphH under varying conditions.
• To characterize the structure, properties, and potential applications of the resulting platinum complexes, particularly the C3-symmetric trimer.

Main Methods:

• Reaction of potassium tetrachloroplatinate(II) with 1,3-bis(N-pyrazolyl)benzene.
• X-ray crystallography for structural determination.
• Nuclear Magnetic Resonance (NMR) spectroscopy for stability studies.

Main Results:

• Formation of Pt(bpzph)Cl and a C3-symmetric trimeric complex, [Pt(mu-bpzph)Cl]3.
• Crystal structure revealed chiral trimers with deep intramolecular cavities (approx. 8 Å) encapsulating solvates.
• NMR studies confirmed excellent thermal and kinetic stability of the trimer.

Conclusions:

• The reaction provides access to novel chiral platinum macrocycles.
• The trimeric complex exhibits high stability and a unique structural motif.
• Chloride ligand substitution offers a pathway for further functionalization and elaboration of the macrocyclic structure.