(18-Crown-6)(trifluoro-methane-sulfonato)-sodium

Area of Science:

• Coordination chemistry
• Supramolecular chemistry
• Crystal engineering

Background:

• 18-crown-6 ether is a macrocycle known for its ability to complex alkali metal cations.
• Trifluoromethanesulfonate is a weakly coordinating anion often used in coordination chemistry.
• Understanding the coordination environment of sodium cations is crucial for developing new materials.

Purpose of the Study:

• To elucidate the coordination structure of the title compound, [Na(CF(3)O(3)S)(C(12)H(24)O(6))].
• To investigate the self-assembly behavior leading to dimer formation.
• To characterize the crystallographic features of the sodium-18-crown-6-trifluoromethanesulfonate complex.

Main Methods:

• Single-crystal X-ray diffraction analysis.
• Crystallographic structure determination.
• Analysis of coordination geometry and intermolecular interactions.

Main Results:

• The sodium cation is eight-coordinate, adopting an irregular hexagonal bipyramidal geometry.
• The equatorial plane is defined by six oxygen atoms from the 18-crown-6 ether.
• Axial positions are occupied by an oxygen from the trifluoromethanesulfonate anion and an oxygen from a symmetry-equivalent crown ether, leading to centrosymmetric dimer formation.

Conclusions:

• The study reveals a novel coordination mode for sodium with 18-crown-6 ether and trifluoromethanesulfonate.
• The observed dimer formation highlights specific intermolecular interactions driving self-assembly.
• This structural insight contributes to the understanding of host-guest chemistry and crystal engineering involving alkali metal complexes.