Sodium 4-(2-pyridinyldiazenyl)resorcinolate monohydrate and ammonium 2,4-dinitro-1-naphthalenolate from powder...

Area of Science:

• Crystallography
• Spectroscopy
• Materials Science

Background:

• Dyestuffs are crucial in various industries.
• Understanding the solid-state and solution-state behavior of dyestuffs is important for their application.
• Crystal structure analysis provides insights into molecular arrangement and interactions.

Purpose of the Study:

• To determine the crystal structures of two specific dyestuffs.
• To investigate the structural stability of dyestuff anions when transitioning from crystalline form to aqueous solution.
• To correlate solid-state structure with solution-state spectral properties.

Main Methods:

• X-ray powder diffraction was employed to elucidate the crystal structures of the two dyestuffs.
• Diffuse reflectance spectroscopy was used to analyze the crystalline samples.
• UV-Vis absorption spectroscopy was performed on aqueous solutions of the dyestuffs.

Main Results:

• The crystal structures of sodium dyestuff hydrate (I) and ammonium dyestuff (II) were successfully determined.
• In both crystal structures, anions form stacks with cations occupying the channels between them.
• Spectral analysis revealed no significant change in anion geometry between the crystalline and solution states.

Conclusions:

• The determined crystal structures provide a detailed understanding of the packing and interactions within the solid state.
• The dyestuff anions exhibit structural robustness, maintaining their geometry upon dissolution.
• This structural stability has implications for the consistent performance of these dyestuffs in various applications.