Chemistry 401

Intermediate Inorganic Chemistry

University of Rhode Island

Exam 3

December 7, 2012

For each of the following compounds or ions: 1) draw the structure and give the point group; 2) indicate the appropriate bonding theory to predict if the compound or ion will be stable or not, briefly explaining your prediction (hint: quantitative predictions are the best); 3) if the compound or ion is paramagnetic, predict the spin-only magnetic moment in units of Bohr-Magnetons; 4) determine if the compound or ion will be Jahn-Teller active and, if so, predict the nature of the distortion.

1. hexacyanoferrate(III) ion

Answer

2. bichlorobiaquacobalt(II) (hint: this is a deep blue color)

Answer

3. hexacarbonylchromium(0)

Answer

4. trans-chlorobis(hydrido)tris(triphenylphosphine)rhodium(III) (hint: the PPh3 ligand freely rotates)

Answer

5. cis-tetraamminebinitritonickel(II)

Answer

6. bis(η1-cyclopentadienyl)bis(η5-cyclopentadienyl)titanium(IV)

Answer

7. pentacyanonitrosylmanganate(III) ion

Answer

8. cis-bibromobichlorocuprate(II) ion

Answer

9. fac-triamminetriaquachromium(III) ion

Answer

10. bi(η6-benzene)molybdenum(0)

Answer

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.