Question

3. (a) What do you understand by spin crossover? Name one compound that shows (4 marks) (b) Describe the effect of temperature and pressure on spin crossover compounds. spin crossover behaviour. Briefly explain the underlying reasons for the observation of these effects (3 marks) Sodium chromate (Na CrO4) is intense yellow in colour. Suggest the origin of the electronic transition that gives rise to the observed colour of [CrO4]. Illustrate your answers with the aid of a simplified molecular orbital energy level diagram Rationalize also the intensity of the absorption in [CrO4] 4. (5 marks)

Answer 1

Answer 3(a and b)

ma?nihile apS-нふg(%) ş;el.cl Th digard 4o hai an Ioe me ati value m luch a phemo menon tae pJacç :- Fe (CN) exQm プで Fe2+ton、 Эт Tanabe-Sugano I AiQ an cuili sdum o tatis coexist Complex beome lus and lo w CROm