1. For the following compounds or ions, give the systematic name, the point group, the crystal field stabilization energy (in units of Dq), the predicted spin-only magnetic moment (in units of Bohr-Magnetons), and determine the predcted distortion if the complex is Jahn-Teller active:
a. (Despite the drawing, the Fe-N-O and Fe-C-N bond angles are 180°.)
2. For the following compounds or ions, give the systematic name, the point group,and predict if the complex will be stable:
3. For Co3+, the spin pairing energy is 21,000 cm–1 and Dq for NH3 (when bonded to Co3+) is 2,300 cm–1. Estimate the wavelength (in units of nm) for the lowest energy spin-allowed d-d transition in [Co(NH3)6]3+. Useful information: nm = 107/cm–1; ν = 10Dq for d6 high spin; and ν ~ 9Dq for d6 low spin.
Spectrochemical series: I– < Br– < S2– < SCN– < Cl– < NO3– < F– < ox2– < H2O < SCN– < CH3CN < NH3 < en < bipy < phen < NO2– < PPh3 < CN– < CO (the underlined atom is the one attached to the metal). ox = oxalate; en = ethylenediamine; bipy = 2,2'-bipyridine; phen = phenanthroline; Ph = phenyl.