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OpticalIsomerism - FIGURE I9.I6 isomers l and II...

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Unformatted text preview: FIGURE I9.I6 isomers l and II of [Co(en)3]3+ are mirror images (the minor image of l is identical to ll) that cannot be superimposed. That is. there is no way that I can be turned in space so that it is the same as H. Mirror image of Isomer I directions and are thus optical isomers. The isomer that rotates the plane of light to the right {when viewed down the beam of oncoming light) is said to be dextrorotatory, designated by d. The isomer that rotates the plane of light to the left is Ievorotatory (I). An equal mixture of the d and I isomers in so- lution, called a racemic mixture, does not rotate the plane of the polarized light at all because the two opposite effects cancel. Geometrical isomers are not necessarily optical isomers. For instance, the trans isomer of [Co{en)2Clz]+ shown in Fig. 19.17 is identical to its mirror Isomer 11 cannot be superimposed exactly on isomer I. Theyr are not identical structures. The trans isomer and its mirror image are identical. They are not isomers of each other. Cl cis' ,NWQOR'CI Isomer] -| J N (a) (b) (EQ'LyN Isomer II has the same ‘ qo\ ," structure as the mirror _ _. -l- - - - C1 image of isomer I. FIGURE l9.|7 (a) The trans isomer of [Co(en)2C|fl+ and its mirror image are identical (superimposable). (b) The cis iso- mer of [Co(en)2C|2]’r and its mirror image are not superimposa'ole and are thus a pair of optical isomers. ...
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