I tried looking for these arrows in the 3rd molecule starting from the left(Pd) online and in my notes but I couldn't find anything. Is Pd actually bonded to something?
- These are not arrows, but fragments of the molecule.
- We suspect they are supposed to mean the allyl ligands.
- This hardly qualifies as inorganic chemistry. Organometallic is probably the right word to use.
- The notation is by no means standard; I would go as far as to call it wrong, and not just a slightly-raised-eyebrow kind of wrong, but a punch-in-the-face kind. Those who want to be understood would draw the same molecule in any of the following shapes:
(There are more possible variants.)
So it goes.