Solvate-free bis-(triphenylphosphine)iminium chloride

Area of Science:

• Inorganic Chemistry
• Crystallography
• Solid-State Chemistry

Background:

• Bis(triphenylphosphine)imide salts are important ligands in coordination chemistry.
• Understanding the structural nuances of these salts is crucial for designing new materials.
• Previous studies have documented a range of P-N-P bond angles in related compounds.

Purpose of the Study:

• To determine the crystal structure of the title compound, C(36)H(30)NP(2)(+)·Cl(-).
• To analyze the symmetry and key bond angles within the cation.
• To compare the observed P-N-P angle with those reported in the literature.

Main Methods:

• Single-crystal X-ray diffraction was employed to elucidate the crystal structure.
• The compound was crystallized from a acetonitrile/diethyl ether solution.
• Symmetry analysis and bond angle measurements were performed.

Main Results:

• The title compound crystallized in a solvate-free form.
• The chloride anion and the nitrogen atom of the cation lie on a twofold axis, resulting in C2 symmetry for the cation.
• The central phosphorus-nitrogen-phosphorus (P-N-P) angle was measured at 133.0(3)°, which is notably low compared to previously observed values.

Conclusions:

• The crystal structure of the bis(triphenylphosphine)imide chloride salt was successfully determined.
• The observed low P-N-P angle provides valuable crystallographic data for this class of compounds.
• This finding contributes to the broader understanding of structural variations in phosphazene derivatives.