For $[Co^{III}(NH_3)_5X]^{3+/2+}+[Cr^{II}(H_2O)_6]^{2+}\to[Co^{II}(NH_3)_5(H_2O)]^{2+}+[Cr^{III}(H_2O)_5X]^{3+/2+}$, which X gives the slowest redox reaction?
A bridging ligand can facilitate inner-sphere electron transfer between chromium and cobalt. Chloride and azide can bridge, whereas coordinated ammonia has its nitrogen lone pair already bound and is poor at providing the required bridge. It consequently gives the slowest of these reactions, B, consistent with the ligand-transfer form of the written reaction.
More Transition Metals: Coordination chemistry – structure and isomerism, theories of bonding (VBT, CFT, and MOT). Metal-metal multiple bonds. Energy level diagrams in various crystal fields, CFSE, applications of CFT, Jahn-Teller distortion. Electronic spectra of transition metal complexes: spectroscopic term symbols, selection rules, Orgel and Tanabe-Sugano diagrams, nephelauxetic effect and Racah parameter, charge-transfer spectra. Magnetic properties of transition metal complexes. Ray-Dutt and Bailar twists, Reaction mechanisms: kinetic and thermodynamic stability, associative, dissociative substitution and redox reactions. questions
GATE 2019 CY Q54– A complex contains one Cr, three Br and six H₂O per formula unit. Excess AgNO₃ gives 0.94…
GATE 2019 CY Q55– For the illustrated doubly bridged dicobalt ethylenediamine complex, how many optically…