Test tubes of copper complex ions.

Test tubes of copper complex ions.

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Credit: MARTYN F. CHILLMAID/SCIENCE PHOTO LIBRARY

Caption: Test tubes of copper complex ions. The ions of transition metals are coloured. This makes it possible to tell which ion is present in a solution. From left to right: The copper/chloride ion is yellow because most the absorption band is in the ultraviolet part of the spectrum - 390nm. The copper/1, 2 diaminoethane (ethylenediamine) ion is purple because the absorption band is in the green part of the spectrum - 530nm. The copper/ammonia ion is dark blue because most the absorption band is in the red part of the spectrum - 620nm. The hydrated copper ion is pale blue because most of the absorption band is in the infrared part of the spectrum - 800nm.

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Keywords: 1-2 diaminoethane, 2 diaminoethane, absorption, absorption band, coloured, complex ions, copper complex, copper/ammonia ion, copper/chloride ion, copper/en ion, diaminoethane, en, ethylenediamine, hydrated copper ion, ions, ligand, no-one, nobody, solution, spectrum, transition metals

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