(a) UV/Vis spectra of [Mn(H2O)]*, [Co(H2O)%]**, and [CoCla are dominated by transitions that have molar extinction coefficients (e) of <10, 10', and >10 M cm, respectively. Rationalise these observations with reference to the electronic configurations of the transition metal ions, the types of transitions involved, and the selection rules for electronic transitions. (b) Dissolving CrCls in water gives the (Cr(H2O)J" ion in solution, (i) Sketch a crystal field splitting diagram for [Cr(H:O), and give the ground state configuration for the chromium ion. (ii) Determine the ground state term symbol for the chromium ion in [Cr(H,O)]". (iii) Determine the term symbols for any excited states to which there are spin-allowed

(a) UV/Vis spectra of [Mn(H2O)]*, [Co(H2O)%]**, and [CoCla are dominated by transitions that have molar extinction coefficients (e) of <10, 10', and >10 M cm, respectively. Rationalise these observations with reference to the electronic configurations of the transition metal ions, the types of transitions involved, and the selection rules for electronic transitions. (b) Dissolving CrCls in water gives the (Cr(H2O)J" ion in solution, (i) Sketch a crystal field splitting diagram for [Cr(H:O), and give the ground state configuration for the chromium ion. (ii) Determine the ground state term symbol for the chromium ion in [Cr(H,O)]". (iii) Determine the term symbols for any excited states to which there are spin-allowed

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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General questions regarding Crystal Field Theory. Use Crystal Field Splitting Diagrams as necessary. a) Identify M (metal) that meets the requirements given - and briefly justify your answer. M(CN)6 with CFSE = 1.2Ao, M is second-row transition metal. MBr having one unpaired electron, M is first-row transition metal. b) Fe(H2O)6* is paramagnetic whereas Os(H2O)6* is diamagnetic. Account for this observation.
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6. a) Discuss the relationship between the octahedral splitting energy, (Aoct), for complex ions and the ligand strength of the ligands in the complex ion. b) Considering only the complexes, Ni(en)3²+ (aq), Ni(NH3)²+(aq), and Ni(H₂O)62+ (aq), determine the relative ligand strengths of ammonia, ethylenediamine and water. Place the ligands in increasing order of ligand strength. (weakest ligand to the strongest ligand.) c) Discuss how you arrived at your conclusion in part b. Include in your discussion your data and/or your calculated values for these complex ions to support your conclusion.
2. Consider a hypothetical trigonal bipyramidal Fe(III) complex [FeF2(OH)3]². We need to divide the five donor atoms of the ligands into two groups: 2F and 30. F HO FeOH F OH (a) Identify the point group of the complex and assign x, y, and z to it. (b) Indicate the symmetries of the Fe valence orbitals, i.e., 3d, 4s, and 4p. (c) Derive the symmetries and expressions of the two F σ-SALCs, considering that each F. atom contributes one 2p orbital with a lone pair to form the σ-SALCs. (d) Derive the symmetries and expressions of the three σ-SALCs on the OH ligands, considering that each O atom contributes one 2p orbital with a lone pair to form the σ- SALCs. (e) Draw a σ bonding-only MO energy level diagram for the complex, mark the MOs with symmetry labels, and fill the MOS with the valence electrons. (f) Consider each O atom contributing one perpendicular 2p orbital to form π-SALCs. Derive the symmetries of the three л-SALCS. (g) Identify the MOs in (e) with which the O л-SALCs interact,…