(4R)-(-)-2-thioxothiazolidine-4-carboxylic acid (raphanusamic acid)

Area of Science:

• Crystallography
• Chemical Physics
• Materials Science

Background:

• Understanding molecular interactions is crucial for predicting material properties.
• Noncentrosymmetric crystal structures are essential for nonlinear optical applications.

Purpose of the Study:

• To determine the crystal structure of the title acid (C4H5NO2S2).
• To elucidate the hydrogen bonding and intermolecular interactions governing its crystal packing.
• To establish the absolute structure of the molecule.

Main Methods:

• Single-crystal X-ray diffraction was employed to analyze the crystal structure.
• Analysis of hydrogen bonds (N--H...O and O-H...S) and C-H...O interactions.
• Determination of the absolute configuration of the crystal.

Main Results:

• The acid crystallized in the noncentrosymmetric space group P2(1)2(1)2(1).
• Two ordered hydrogen bonds (N--H...O and O-H...S) and three significant C-H...O interactions were identified.
• These interactions link molecules into layers and form a three-dimensional network.

Conclusions:

• The determined crystal structure provides insights into the intermolecular forces of the acid.
• The noncentrosymmetric nature and specific bonding patterns are key features of this molecular assembly.
• The established absolute structure is vital for potential applications leveraging its unique properties.