Characteristic properties a general perspective

In this section, we introduce properties that are characteristic of J-block metal compounds. More detailed discussion follows in Chapter 20. 

The intense colours of species such as [Mn04] have a different origin, namely charge transfer absorptions or emissions. The latter are not subject to selection rule 20.4 and are always more intense than electronic transitions between different d orbitals. We return to electronic spectra in Section 21.7. 

Colour of light absorbed Approximate wavelength ranges / nm Corresponding wavenumbers (approximate values)/cm Colour of light transmitted, i.e. complementary colour of the absorbed light 

In a colour wheel representation, complementary colours are in opposite sectors 

When an electronic spectrum exhibits more than one absorption in the visible region, the simplicity of the colour wheel does not hold. 

The colours of fi -block metal compounds are a characteristic feature of species with ground state electronic configurations other than and For example. 

A chrotnophore is the group of atoms in a molecule responsible for the absorption of electromagnetic radiation. 

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