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Polymorphism in crystalline cinchomeronic acid.

Dario Braga1, Lucia Maini, Concezio Fagnano

  • 1Dipartimento di Chimica G. Ciamician, Università degli studi di Bologna, Via Selmi 2, 40126 Bologna, Italy.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|November 1, 2006
PubMed
Summary

Cinchomeronic acid (CA) exhibits two crystal forms, with the orthorhombic polymorph being the most stable. Differences in hydrogen bonding strength explain the varying stability of these CA crystal structures.

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Area of Science:

  • Solid-state chemistry
  • Crystallography
  • Spectroscopy

Background:

  • Cinchomeronic acid (CA), also known as 3,4-dicarboxypyridine, exists in multiple crystalline forms (polymorphs).
  • Understanding the structural relationships and stability of these polymorphs is crucial for predicting material properties and behavior.

Purpose of the Study:

  • To investigate the structural relationship between the two known crystal forms of cinchomeronic acid.
  • To determine the thermodynamic stability of each polymorph and identify factors influencing their stability.

Main Methods:

  • Single crystal X-ray diffraction was employed to analyze the crystal structures.
  • Infrared (IR) and Raman spectroscopy were used to probe molecular vibrations.
  • Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy provided insights into the molecular environment.

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Main Results:

  • The two polymorphs of CA form a monotropic system.
  • Orthorhombic form I was identified as the thermodynamically stable form, while monoclinic form II is unstable.
  • CA crystallizes as a zwitterion in both forms and decomposes prior to melting.

Conclusions:

  • The difference in stability between the two CA polymorphs is attributed to variations in hydrogen-bonding patterns.
  • The strength of hydrogen bonds involving the protonated nitrogen atom and carboxylate groups dictates the overall stability.