Synthesis and Crystal Structures of Three Pyrazine-2-carboxylate Containing Isostructural Complexes: M(2-pyrazine-carboxylate)3 (M = Co+3, Cr+3, and Rh+3)

Abstract

Three new isostructural coordination complexes, M(pca)3, where M = Co (1), Cr (2), or Rh (3) and 2-pyrazine-carboxylate (pca), have been synthesized solvothermally and characterized by single crystal X-ray diffraction and powder X-ray diffraction. In structures 1-3, the pca ligand chelates to the metal centers in a tris-chelating arrangement through proximal nitrogen and oxygen donor atoms. Structures 1-3 are monoclinic and crystallize in the space group C2/C. In structure 1, a = 28.066(13) Å, b = 8.036(4) Å, c = 13.577(6) Å, and β = 90.2(10)°. In structure 2 a = 28.318(3) Å, b = 8.089(4) Å, c = 13.792(12) Å, and β = 90.256(2)°. In structure 3, a = 28.679(4) Å, b = 8.051(13) Å, c=13.847(2) Å, and β = 90.585(2)°.

Graphical Abstract

Three new isostructural coordination complexes, M(pca)3, where M = Co, Cr, or Rh and 2-pyrazine-carboxylate (pca), have been synthesized solvothermally and characterized by single crystal X-ray diffraction and powder X-ray diffraction.

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Acknowledgement

We are grateful for financial support from the National Science Foundation through Grant CHE:0714439.

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Correspondence to Hans-Conrad zur Loye.

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Ellsworth, J.M., Khaliq, Z.M., Seward, K.L. et al. Synthesis and Crystal Structures of Three Pyrazine-2-carboxylate Containing Isostructural Complexes: M(2-pyrazine-carboxylate)3 (M = Co+3, Cr+3, and Rh+3). J Chem Crystallogr 37, 749–754 (2007). https://doi.org/10.1007/s10870-007-9245-2

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Keywords

  • Rhodium
  • Metal Center
  • Cambridge Crystallographic Data Centre
  • Chromium Nitrate
  • Cobalt Center