Q5. (i) pentacarbonyl complex with (1) a primary amine, NH2R', and (2) a secondary amine, NHR'2. Draw the molecule structure of both end products. N.B. Consider the amines as NR2 + 2H* (protonated imide group) and NR',¯ +H* Briefly describe the reaction of the above dithiocarbene ligand in the depicted tungsten (protonated amide group). (ii) (reaction (1)), but starting instead with the complex [W(CO)s(CN)] ¯and using a different Suggest an alternative route to the product obtained with the primary amine NHR' appropriate reagent Y. co CO + NH2R' ?? CO OC. Y CO SR oc OC ENI CO CO SR co ICO + NHR'2 ?? SR CO SR 8.

7. State hapticity of C6H6 and C5H, ligands in the following complex. Assume total number of valence electrons is 16. H PPh3 C6H6 水 C6H6 C5H5 C5H5 CO PPh3

80 70 60 50 T 40 30 20 10 ATE 10 20 30 40 50 A/B O 1 and 4 2 and 2 O 3 and 3 2 and 3 3 and 4 E/B

The electronic absorption spectrum of an acidic solution of [Ti(H,O),JP* exhibits two well-separated bands at 430 and 650 nm, respectively, assignable to "d-d transition. But the oxidized form [Ti(H,O),}³" shows only one absorption at 490 nm with a shoulder around 580 nm. Explain the observation. A. [Ti(H;O),J³* has more d electrons than [Ti(H;O).J**. B. [Ti(H,O),]³" is a strong oxidizing agent. C. [Ti(H,O),}³" shows stronger Jahn-Teller effect. D. [Ti(H,O)]" shows stronger Jahn-Teller effect. E. H,0 is a weak-field ligand.