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Among the (pi) acid ligands of groups 15 and 16, which is the most similar, regarding the capacity of
retro-donation, to the CO? Why?
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- a) Give one similarity and one difference between “monodentate” and “bidentate” ligands. b) Which one of the types of ligands named in part “b” is more closely related to the term “chelating agent”? Please explain.What is a distinguishing feature of the reaction coordinate for ligand substitution at square planar platinum in the case of ethylene as the ligand that is trans to the leaving group?Regarding the formation of the tetracyanetoniquelate (II) complex answer:a.Demonstrates hybridization according to the valence bond theory and indicate itsgeometry.b. Demonstrate and explain the unfolding of the crystalline field in the formation of this ioncomplex.c. Demonstrate through a diagram of molecular orbitals and explain the formation of that ioncomplex according to the ligand field theory
- In general, would you expect EDTA4- to coordinate to transition metal ions more or less strongly than ethylenediamine does? Justify your answer with a reason other than the different charges on the two ligands.Draw the appropriate completely Orgel Diagram and use it to assign elctronic transition/s to any of these bands , confirming the colour of the complexDraw the SALC set for the ferrocene ligand set, describing in detail the steps used. Which isomer are you considering?
- Generally speaking, for a given metal and ligand, the stability of a coordination compound is greater for the metal in the +3 rather than in the +2 oxidation state (for metals that form stable +3 ions in the first place). Suggest an explanation, keeping in mind the Lewis acid–base natureof the metal–ligand bond.Criticize and correct the following statement: strong-fieldligands always give rise to low-spin complexes.Many transition metal complexes are said to follow the “18-electron rule,” meaning they form particularly stable complexes when the metal + ligand electrons contributing to the MOs add up to a total of 18 electrons. a. Use the full MO diagram for an octahedral metal complex with pi-acidic ligands we derived in class to justify why 18-electrons might be particularly stable. b. Use the 18-electron rule to predict which 1st row transition metal would be most likely to form an octahedral M(CO)6 (Note: there is no charge; the metal retains all its electrons.) c. Qualitatively, how would you expect the CO bond to change when it forms this complex? Would it be stronger, weaker, or the same compared to free CO? (Hint: think about what a ? −???? means and what the orbital does from the perspective of the M–CO interaction as well as the C– O interaction).
- Comment on the use of IR spectroscopy in the characterisation of transition metal complexes.State one (1) limitation of this technique.Why wouldn't this ruthenium catelyst, with two trans IMes ligands, be good at catalysing alkene metathesis?Describe and compare the π-acceptor ability of the CE ligands
