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Complexation (1 Viewer)

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Why do metal cations usually have 6 ligands e.g copper 2+ further why do is it in the complexation reactions e.g that with cu and hydroxide that the 2 hydroxides becomes ligands while 2 waters come out of the structure. Any help would be appreciated thank you!
 

wizzkids

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There are two common coordination numbers exhibited by metallic complexes, they are 4 and 6. The coordination number can vary with the ligand, even when the central metal ion stays the same. The coordination number is influenced by the relative sizes of the central metal and the ligands.
Copper (II) ions are hydrated by a coordination shell of six water molecules.
Why do you need to know this stuff? This is getting way outside the high school Chemistry curriculum.
 

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thanks i kinda wanna know the process behind it out of interest
 

wizzkids

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OK. There is nothing wrong with delving deeper into coordination Chemistry, if you can spare the time and interest. The really interesting property of metallic coordination complexes for me is understanding why so many of them are intensely coloured. The visible colour suggests that quantum energy transitions in the bonding electrons correspond to the energies of red, green, and blue light photons, and the colour can change depending on the number of ligands in the coordination shell. You will learn more about colour absorbance in Module 8 Applying Chemical Ideas
 
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