Kemi
LIDT HJÆLP
15. marts 2007 af
E=m*c^2 (Slettet)
Er der nogen der kan forklare mig disse begreber:
Enantiomere
Diasteriomer
Meso
Er der nogen der kan forklare mig disse begreber:
Enantiomere
Diasteriomer
Meso
Svar #1
15. marts 2007 af eZtaR (Slettet)
"Enantiomerer eller spejlbilledisomerer er betegnelsen for to molekyler hvis kemiske struktur er ens, men som er hinandens spejlbilleder. De to molekyler indeholder derfor den samme slags grundstoffer og de samme kemiske bindinger, men har forskellig rumlig opbygning. Sådanne to molekyler har ens kemiske og fysiske egenskaber, bortset fra at de roterer planpolariseret lys i modsat retning. En blanding af lige store mængder af to enantiomerer kaldes en racemisk blanding. En racemisk blanding roterer ikke polariseret lys.
Denne form for isomeri spiller en stor rolle i biologien, da det typisk kun er den ene enantiomer der bruges, mens den anden ingen indflydelse har eller ligefrem negativ indflydelse på organismen." - http://da.wikipedia.org/wiki/Enantiomer
"Diastereomers (or diastereoisomers) are stereoisomers that are not enantiomers (mirror images of each other). Diastereomers can have different physical properties and different reactivity. In another definition diastereomers are pairs of isomers that have opposite configurations at one or more of the chiral centers but are not mirror images of each other [1].
In simple terms two stereoisomers are said to be diastereoisomers if they are not mirror images of each other and one or more stereogenic centres differ between the two stereoisomers. According to this same definition, geometric isomerism is a form of diastereomerism." - http://en.wikipedia.org/wiki/Diastereomer
"A meso compound or meso isomer is a chemical compound with molecules that contain 2 or more asymmetric atoms (stereocenters) but which is optically inactive (or achiral) because it contains an internal plane of symmetry" - http://en.wikipedia.org/wiki/Meso_compound
Håber det kune opklare lidt :)
Denne form for isomeri spiller en stor rolle i biologien, da det typisk kun er den ene enantiomer der bruges, mens den anden ingen indflydelse har eller ligefrem negativ indflydelse på organismen." - http://da.wikipedia.org/wiki/Enantiomer
"Diastereomers (or diastereoisomers) are stereoisomers that are not enantiomers (mirror images of each other). Diastereomers can have different physical properties and different reactivity. In another definition diastereomers are pairs of isomers that have opposite configurations at one or more of the chiral centers but are not mirror images of each other [1].
In simple terms two stereoisomers are said to be diastereoisomers if they are not mirror images of each other and one or more stereogenic centres differ between the two stereoisomers. According to this same definition, geometric isomerism is a form of diastereomerism." - http://en.wikipedia.org/wiki/Diastereomer
"A meso compound or meso isomer is a chemical compound with molecules that contain 2 or more asymmetric atoms (stereocenters) but which is optically inactive (or achiral) because it contains an internal plane of symmetry" - http://en.wikipedia.org/wiki/Meso_compound
Håber det kune opklare lidt :)
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