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The hexaquo manganese(II) ion contains f...

The hexaquo manganese(II) ion contains five unpaired electrons, while the hexacyanoion contains only one unpaired electron. Explain using Crystal Field Theory.

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Mn in +2 state has the ground state outer electronic configuration : `3d^6`. In presence of `H_2O` as ligand, the distribution of these five elections is `t_(2g)^3 e_g^2`, i.e., all the electrons remain unpaired. In presence of strong `CN^(-)` ligand, the distritution is `t_(2g)^5 e_g^(0)`, i.e., two `t_(2g)` orbitals contain paired electrons while the thrid `t_(2g)` orbital contains orie unpaired electron.
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If hydrogen atoms (in the ground state ) are passed through an homogeneous magnetic field, the beam is split into two parts. This interaction with the magnetic field shows that the atoms must have magnetic moment. However, the moment cannot be due to the orbital angular momentum since l=0. Hence one must assume existence of intrinsic angular momentum, which as the experiment shows, has only two permitted orientations. Spin of the electron produce angular momentum equal to S=sqrt(s(s+1))(h)/(2pi) where S=+(1)/(2) . Total spin of an atom = +(n)/(2) " or "-(n)/(2) where n is the number of unpaired electrons. The substance which contain species with unpaired electrons in their orbitals behave as paramagnetic substances. The paramagnetism is expressed in terms of magnetic moment. The magnetic moment of an atom mu_(s)sqrt(s(s+1))(eh)/(2pimc)=sqrt((n)/(2)((n)/(2)+1))(eh)/(2pimc)" "s=(n)/(2) impliesmu_(s)=sqrt(n(n+1)) B.M. 1. B.M. (Bohr magneton)= (eh)/(4pimc) If magnetic moment is zero the substance is diamagnetic. Which of the following ion has lowest magnetic moment?

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BETTER CHOICE PUBLICATION-CO-ORDINATION COMPOUNDS-QUESTION FROM PREVIOUS BOARD EXAMINATION
  1. The hexaquo manganese(II) ion contains five unpaired electrons, while ...

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  2. Write the IUPAC name of corordination compound [Co(NH3)3ONO]Cl2.

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  3. How many isomers are possible for the netural complex [Co(NH3)3Cl3]? D...

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  4. Discuss the nature of bonding in the following coordination entities o...

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  5. Write the IUPAC name for the corordination compound. [Zn(NH3)4]2+

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  6. Explain: [Ni (CN)4]^(2-) is diamagnetic while [Ni(Cl)4]^(2-) is parama...

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  7. Write IUPAC name of the following K2[Zn(OH)4]

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  8. Write IUPAC name of the following K3[Al(C2O4)]3

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  9. Write IUPAC name of the following K2[Cu(CN4)]

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  10. Write IUPAC name of the following [Co(NH3)3Cl]Cl2

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  11. Write IUPAC name of the following [Co(en)2Br2Cl

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  12. Write IUPAC name of the following [Co(NH3)5Br]Cl2

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  13. Write IUPAC name of the following K3[Fe(C2O4)3]

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  14. Write IUPAC name of the following Na[Au(CN)2]

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  15. Write IUPAC name of the following K2[Fe(CN)6]

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  16. Write IUPAC name of the following K2[Fe(CN)6]

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  17. Write the IUPAC name of the following : K3[Fe (CN)5 NO]

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  18. Write IUPAC name of the following K3[Cr(C2O4)3]

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  19. Write IUPAC name of the following K3[Cr(C2O4)3]

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  20. Write IUPAC name of the following K[PtCl3(NH3)]

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  21. Write IUPAC name of the following K2[Fe(CN)6]

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