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Colour changes due to ligand exchange

Colour changes due to ligand exchange

A500/0191

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Credit

JERRY MASON / SCIENCE PHOTO LIBRARY JERRY MASON / SCIENCE PHOTO LIBRARY

Caption

Colour changes due to ligand exchange. Samples of solutions containing various complex ions of nickel, showing the effect of ligand exchange on colour. At left (green) is a solution containing the hexaaquanickel(II) ion; six water molecules surrounding a nickel atom. In the next solution (pale blue), each complex ion has had two water molecules replaced by a single 1, 2-diaminoethane molecule. Right of centre (dark blue), a further two water molecules have been replaced. At right (purple), the complex now consists of three 1, 2- diaminoethane molecules and no water around each nickel atom.

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