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One- and two-dimensional polymers from proline and calcium bromide.

Kevin Lamberts1, Mihaela-Diana Şerb2, Ulli Englert1

  • 1Institut für Anorganische Chemie, RWTH Aachen, Landoltweg 1, 52074 Aachen, Germany.

Acta Crystallographica. Section C, Structural Chemistry
|April 4, 2015
PubMed
Summary

Calcium bromide reacts with proline, forming distinct solid structures based on proline

Keywords:
bridging ligandscalcium bromidecalcium polymerchiralitycrystal structureone-dimensional coordination polymerracemic compoundstwo-dimensional networkzwitterionic proline

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Area of Science:

  • Coordination chemistry
  • Supramolecular chemistry
  • Crystallography

Background:

  • Amino acids like proline can act as ligands in coordination complexes.
  • Calcium bromide is an ionic compound with potential for complex formation.

Purpose of the Study:

  • To investigate the reaction products of calcium bromide with enantiopure and racemic proline.
  • To understand how proline chirality influences the resulting solid-state structures.

Main Methods:

  • Crystallization of calcium bromide with DL-proline and L-proline.
  • X-ray diffraction analysis to determine crystal structures.
  • Characterization of coordination environments and ligand binding modes.

Main Results:

  • Two distinct solid compounds were synthesized and characterized.
  • Racemic proline yielded cationic heterochiral chains with uncoordinated bromide anions.
  • L-proline formed a 2D network containing an unexpected CaBr2 unit.

Conclusions:

  • The chirality of proline dictates the topology of the resulting calcium coordination compounds.
  • Proline can act as a bridging ligand, leading to diverse structural motifs.
  • Coordination behavior differs significantly between racemic and enantiopure proline systems.