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CHAPTER 12: COORDINATION CHEMISTRY IV: REACTIONS …

172 CHAPTER 12 COORDINATION CHEMISTRY IV: REACTIONS and Mechanisms Copyright 2014 Pearson Education, Inc. CHAPTER 12: COORDINATION CHEMISTRY IV: REACTIONS AND MECHANISMS [Cr(H2O)6]2+ is labile, and has 4 unpaired electrons, with 1 in the anti-bonding eg orbital. Occupation of this orbital renders substitution easier by leading to relatively weak chromium(II) aqua ligand bonds. [Cr(CN)6]4 is inert. It has all 4 metal valence electrons in the bonding t2g levels. These orbitals are rendered bonding in character due to -backbonding with the cyanide ligands.

Rate = (k1 + k2[As(C6H5)3])[Co(NO)(CO)3] This reaction shows both first and second order kinetics; the ligand substitution likely occurs via two mechanisms. The first order reaction appears to be a dissociative reaction or a solvent-assisted dissociation of CO, followed by a fast addition of As(C6H5)3. The other path shows first

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