IMG_NEW_0012_001

IMG_NEW_0012_001 - Some Definitions: Two molecules that are

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Experimentally, the OPTICAL ROTATION (degree to which a molecule rotates polarized light) is measured in a polarimeter. See configuration below: polarizer light source light source comes from sodium arc. l" = 589 nm referred to as sodium d line cylindrical sample holder containing solution of chiral molecule cr = observed rotation (measured on Dolarimeter) c = concentration '1@,,^ ^*( *-Ii* +r,be: is Ie(*' | = length of sample tiib-e (in dm) o = indicates light source was sodium d line WV @w) [a]o = specific rotation (a constant for every chiral molecule!) [o]o =a l(l x c) if one enantiomer of a molecule has a specific rotation of +6 then the other enantiomer will have a specific rotation of -6.
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Unformatted text preview: Some Definitions: Two molecules that are non-superimposible mirror images of one another are ENANTIOMERS. Enantiomers are a type of isomer known as STEREOISOMER - or molecules that are connected in the same way but differ in their spatial arrangement STEREOCENTER - an atom in a molecule at which the interchange of two groups produces a stereoisomer (or enantiomer). A stereocenter is also referred to as an asymmetric center. A tetrahedral carbon with four different groups attached is a chiral center. The configuration of a stereocenter can be defined as R or S (see below). CHIRAL MOLECULE - a molecule that rotates plane polarized light....
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This note was uploaded on 12/27/2011 for the course CHEM 282 taught by Professor Nabylmerbouh during the Fall '10 term at Simon Fraser.

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