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Advanced Level Inorganic Chemistry: UV-visible light absorption spectroscopy of nickel complexes

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Doc Brown's Advanced Chemistry: PART 15.5 uv and visible absorption spectra of nickel complex ions - transition metal absorption spectroscopy - nickel compounds - complexes

Doc Brown's Chemistry Advanced Level Pre-University Chemistry Revision Study Notes for UK IB KS5 A/AS GCE advanced A level organic chemistry students US K12 grade 11 grade 12 organic chemistry courses Spectroscopic methods of analysis and molecular structure determination investigating nickel complexes

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15.5.1 The origin of colour, the wavelengths of visible light, our perception!

15.5.2 uv-visible spectroscopy theory, spectrometer, examples of absorption & reflectance spectra explained

15.5.3 uv-visible absorption spectra - index of examples: uses, applications, more on the chemistry of colour

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The uv and visible absorption spectrum of nickel complex ions

(a) The visible light absorption spectrum of the hexaaquanickel(II) ion

uv-visible absorption spectrum of the octahedral hexaaqunickel(II) complex ion Ni2+(aq) water ligand

structure of the hexaaquanickel(II) complex ion octahedral green colourThe hexaaquanickel(II) complex ion, [Ni(H2O)6]2+(aq)  is green because of the combination of transmitted blue plus.

There are two prominent  absorption peaks at λmax of 450 nm and λmax at 700 nm

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(b) The visible light absorption spectrum of the hexaamminenickel(II) ion

uv-visible absorption spectrum of the octahedral hexaamminenickel(II) complex ion Ni2+ with ammonia ligand

structure of the hexaaquanickel(II) complex ion octahedral pale blue colourThe hexaamminenickel(II) complex ion, [Ni(NH3)6]2+(aq)  is pale blue, with strong absorption in the yellow region - complimentary colours.

There are two prominent  absorption peaks at λmax of 360 nm and λmax at 590 nm.

The first absorbance peak stretches over the near ultraviolet and violet region of the visible spectrum.

 

(c) The electronic explanation of the colour in nickel(II) complex ions

Diagram show the ligand field splitting of the Ni2+ ion from the effect of six ligands in an octahedral complex ion of nickel hexaaquanickel(II) ion hexaamminenickel(II) ion

Diagram to show the ligand field splitting of the Ni2+ ion from the effect of six water or ammonia ligands in an octahedral complex ion of nickel.

∆Eelec will differ for each ligand combination, for the same central nickel ion (Ni2+), hence each nickel complex will have a different colour.



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Associated links

UV and visible spectroscopy index

General introduction to electron configuration of transition metal ions and colour theory

SPECTROSCOPY INDEXES

The chemistry of nickel

Index of Advanced A level Notes on the 3d block and Transition Metals

All Advanced Inorganic Chemistry Notes

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