Question

(a) The [Ni(OH2)6]2+ ion is green, whereas [Ni(NH3)6]2+ ion is purple and [Ni(en)3]2+ is violet. Which complex ion absorbs light with the shorter wavelength? Explain. (b) The isoelectronic ions VO4 3- (colorless), CrO42- (yellow), and MnO4- (purple) all have intense charge transfer transitions. The wavelengths of these transitions increase in this series, with MnO4- having its charge transfer absorption at the longest wavelength. Suggest a reason for this trend. (c) Coordination compounds undergo two main mechanisms. Does the complex [CoCl(NH3)5]Cl2 prefer SN1 mechanism or SN2 mechanism? Give reasons for your choice and write equations to explain the mechanism.

          (a) The [Ni(OH2)6]2+ ion is green, whereas [Ni(NH3)6]2+ ion is purple and [Ni(en)3]2+ is violet. Which complex ion absorbs light with the shorter wavelength? Explain.
(b) The isoelectronic ions VO4 3- (colorless), CrO42- (yellow), and MnO4- (purple) all have intense charge transfer transitions. The wavelengths of these transitions increase in this series, with MnO4- having its charge transfer absorption at the longest wavelength. Suggest a reason for this trend.
(c) Coordination compounds undergo two main mechanisms. Does the complex [CoCl(NH3)5]Cl2 prefer SN1 mechanism or SN2 mechanism? Give reasons for your choice and write equations to explain the mechanism.

Added by Ashley S.

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