Problem

(a) The values of emax for the most intense absorptions in the electronic spectra of [CoCl...

(a) The values of emax for the most intense absorptions in the electronic spectra of [CoCl4]2- and [Co(OH2)6]2h differ by a factor of about 100. Comment on this observation and state which complex you expect to exhibit the larger value of emax.

(b)  in the electronic absorption spectrum of a solution containing [V(OH2)0]3+, two bands are observed at 17 200 and 25 600 cm-1. No absoiption for the A2g— T\g(F) transition is observed. Suggest a reason for this, and assign the two observed absorptions.

(c)   Red crystalline [NiCl2(PPh2CH2Ph)2] is diamagnetic. On heating to 387 K for 2 hours, a blue-green form of the complex is obtained, which has a magnetic moment of 3.18/ib at 295 K. Suggest an explanation for these observations and draw structures for the complexes, commenting on possible isomerism.

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Solutions For Problems in Chapter 20