- B Octahedral Chromium Hexacarbonyl Cr Co Was Synthesised Ir Raman Spectroscopy Of The Carbonyl Stretches Showed 1 (77.39 KiB) Viewed 11 times
(b) Octahedral chromium hexacarbonyl, [Cr(CO).] was synthesised. IR/Raman spectroscopy of the carbonyl stretches showed one IR active and two Raman active bands. (0) Explain briefly why none of the bands present are active in both IR and Raman spectroscopy. (2 marks) (ii) One of the carbonyl ligands was replaced by an ammonia ligand, with no other changes to the structure of the compound. State which point group the new compound belongs to. You should provide reasoning and appropriate sketches to support your answer. (3 marks) How many infra-red active carbonyl stretches would you expect to observe in the new molecule? (8 marks) (iii)