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General Chemistry Principles, Patterns, and Applications, 2011

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In addition, two structures are possible in which one of the halides is trans to a water lig<strong>and</strong>. In the first,<br />

the chloride lig<strong>and</strong> is in the same plane as the oxalate lig<strong>and</strong> <strong>and</strong>trans to one of the oxalate oxygens.<br />

Exchanging the chloride <strong>and</strong> bromide lig<strong>and</strong>s gives the other, in which the bromide lig<strong>and</strong> is in the same<br />

plane as the oxalate lig<strong>and</strong> <strong>and</strong> trans to one of the oxalate oxygens:<br />

This complex can therefore exist as four different geometrical isomers.<br />

Exercise<br />

Draw all the possible geometrical isomers for the complex [Cr(en) 2(CN) 2] + .<br />

Answer:<br />

Two geometrical isomers are possible: trans <strong>and</strong> cis.<br />

Summary<br />

Saylor URL: http://www.saylor.org/books<br />

Saylor.org<br />

2150

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