Solveeit Logo
Login

Question

Question: A typical sesquioxide of \(Rb/R{{b}_{4}}{{O}_{6}}\) can be represented as: A. \([R{{b}_{4}}{{({{O}...

A typical sesquioxide of Rb/Rb4O6Rb/R{{b}_{4}}{{O}_{6}} can be represented as:
A. [Rb4(O2)2−(O2)22][R{{b}_{4}}{{({{O}_{2}})}^{2-}}{{({{O}_{2}})}_{2}}^{2}]
B. Rb4(O2−)6R{{b}_{4}}{{({{O}^{2-}})}_{6}}
C. RbO2,(Rb2O2)2Rb{{O}_{2}},{{(R{{b}_{2}}{{O}_{2}})}_{2}}
D. Rb2O,(Rb2O2)2R{{b}_{2}}O,{{(R{{b}_{2}}{{O}_{2}})}_{2}}

Explanation

Solution

Sesquioxide can be defined as an oxide which contains three atoms of oxygen with two atoms or radicals of another element. Examples of sesquioxide are aluminium oxide which is represented as Al2O3A{{l}_{2}}{{O}_{3}}.

Complete step by step answer:
Generally all alkali metal sesquioxides are expected as in case of sesquioxides it contains peroxide or superoxide but in case of alkali metals sesquioxide contain peroxide and superoxide both. Peroxide is represented by O22−{{O}_{2}}^{2-} while superoxide is represented by O2−{{O}_{2}}^{-} ions. Out of the various alkali oxide the sesquioxides Rb4O6R{{b}_{4}}{{O}_{6}} and Cs4O6C{{s}_{4}}{{O}_{6}} are of special interest. With the help of electronic structure calculations by using the local spin-density approximation predicted that Rb4O6R{{b}_{4}}{{O}_{6}} should be a half-metallic ferromagnet which was later contradicted when an experimental investigation of the temperature dependent magnetization of Rb4O6R{{b}_{4}}{{O}_{6}} showed a low-temperature magnetic transition and differences between ZFC means zero field cooled and FC i.e. field cooled measurements. This proves that Rb4O6R{{b}_{4}}{{O}_{6}} and Cs4O6C{{s}_{4}}{{O}_{6}} comprises two different types of dioxygen anions known as hyperoxide and the peroxide anions. The nonmagnetic peroxide anions do not contain unpaired electrons while the superoxide anions contain unpaired electrons in antibonding orbitals.
And a typical sesquioxide of Rb/Rb4O6Rb/R{{b}_{4}}{{O}_{6}} is represented as [Rb4(O2)2−(O2)22][R{{b}_{4}}{{({{O}_{2}})}^{2-}}{{({{O}_{2}})}_{2}}^{2}]

Hence we can say that option A is the correct answer.

Note: Many sesquioxides contain the metal in the +3 oxidation state and their crystal structures are verified by using powder x-ray diffraction. The mixed valency of both compounds is confirmed by using Raman spectroscopy and time-dependent magnetization experiments which indicates that Rb/Rb4O6Rb/R{{b}_{4}}{{O}_{6}} show magnetic frustration.