Synthesis, Characterization and Catalytic Studies of Chromium(III) Porphyrin Complex with axial cyanate ligands
Résumé
We report the synthesis and the spectroscopic, structural and electrochemical characterization of a new chromium(III) coordination compound namely the bis(cyanato-N)[meso-tetratolylporphyrinato]chromate(III) (cryptand-222)potassium dihydrate [K(crypt-222)][CrIII(TTP)(NCO)2]•2H2O (complex I). This compound crystallizes in the orthorhombic crystal system with the non-centrosymmetric space group C2221. The chromium and the potassium atoms are located at special positions in a two-fold axis. The crystal lattice of complex I is stabilized by O-H…O, C-H…O, C-H…N and C-H…pi intermolecular contacts involving the negatively charged [CrIII(TTP)(NCO)2]- species, the [K(crypt-222)]+ counterions and the two non-coordinated water molecules. Further insights on these weak intermolecular contacts are provided by the Hirshfeld surface analysis. Molecular electrostatic potential (MEP) theoretical calculation on [K(crypt-222)][CrIII(TTP)(NCO)2]•2H2O are reported. The new Cr(III) complex was efficient as a catalyst in the decomposition of Rhodamine B (RbH) dye by hydrogen peroxide. This coordination compound was also tested as photocatalyst of the photodecomposition of RbH dye by molecular oxygen.
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