• ImplyingImplications@lemmy.ca
      link
      fedilink
      English
      arrow-up
      28
      ·
      3 days ago

      It’s the title of the post: Enantiomer an identical chemical structure but mirrored. Think of how your hands are left and right. They’re identical in their structure, but are mirrored. Molecules can have the same thing and were denoted by L and D (but now use + and -)

    • FoxyFerengi@startrek.website
      link
      fedilink
      English
      arrow-up
      16
      ·
      edit-2
      3 days ago

      Some molecules have a rotation that is centered on a chiral carbon atom and is named by the way the other atoms of the molecule rotate. There are some rules to it, but L is levorotatory and means it rotates to the left or counter-clockwise. D is dextrorotatory and spins to the right, or clockwise.

      Edit: spelling errors lol

        • deranger@sh.itjust.works
          link
          fedilink
          English
          arrow-up
          3
          ·
          edit-2
          3 days ago

          Not any molecule, it’s gotta be able to have stereoisomers in the first place. There’s no R or S water for example. D/L notation is for biology.

          • protist@mander.xyz
            link
            fedilink
            English
            arrow-up
            4
            ·
            3 days ago

            Well yes, it does have to have chirality, I just meant it doesn’t have to contain any specific elements.

            I’m definitely no expert, but isn’t the D/L notation used in all of chemistry? Sometimes it’s written Δ/Λ, but that’s the same thing. Doesn’t it just describe a molecule’s geometry in a different way from R/S?

            • deranger@sh.itjust.works
              link
              fedilink
              English
              arrow-up
              1
              ·
              edit-2
              2 days ago

              D/L refers to the entire molecule and how it polarizes light whereas R/S looks at every chiral center and has a priority system to assign. I’ve only really seen D/L in biochemistry, regular chemistry is using R/S notation. D/L is the older less precise notation. R/S is much more specific and isn’t related to polarization of light.

  • 211@sopuli.xyz
    link
    fedilink
    English
    arrow-up
    5
    ·
    2 days ago

    TIL chemists clearly got confused by D(ex)/S(in) and R(ight)/L(eft).