. (8 pts.) Consider the stereochemical changes that accompany the dissociation mechanisms for ligand substitution reactions involving complexes of the form A-cis-[M(LL)2BX]. The three possible 5-coordinate intermediate ligand arrangements are shown. Draw all reaction pathways that lead to A product isomers. X B -B B - X -X B + Y - X B до + Y + Y ? ?
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- Q6. (i) Complete the steps in the reaction path converting the depicted thiocarbonyl complex [W(CO)s(CS)] to the dithiocarbene product (R = alkyl), by using appropriate nucleophilic and electrophilic reagents. CO CO OCli. W CO OC CS SR C CO CO SR Describe briefly the reaction of the above dithiocarbene ligand with a secondary (ii) amine, NH2R', and draw the product structure. N.B. Consider the amine as NR + 2H" (protonated imide group).-R -R N- H-B: H-B R R NCCD3 + CH2CI2 N. CICH2CI CD;CN CH3 CH3 R. A B A similar iridium complex was studied. It was found that the reaction with a Tp ligand where R = Me occurred with a very high rate (tsp< 5 s at0 °C), while the unsubstituted Tp complex had a much slower ligand substitution rate (tap = 75 min at room temp). Based on this result, does this complex undergo ligand substitution by the same mechanism as the ruthenium complex, or by another mechanism. Explain.(a) Give the formal oxidation number and the d-electron count of the transition element and the total number of valence electrons in metal complexes A - E. (C5Me5 = pentamethylcyclopentadienyl, 1,5-COD = 1,5-cyclooctadiene) A Ti(1³-C5Me5)2(1²-C₂H4) B_V(n-Cp)z C Nb(=CHCMe3)(CH₂CMe3)3 D Pt(1,5-COD)Me2 E ZnEt₂
- Give answer all questions with explanation please5) Consider the rhodium complex below. Reaction with 1 equivalent of oxygen gas oxidizes the metal centre and gives a new complex with cis, distorted octahedral geometry. Draw the structure of the product and give the oxidation state, valence electron count, and d-electron count for both rhodium complexes. Ar 1 eq. O2 Ph3P. Rh Ph3P -"Bu ?[2] For the following pair of compounds, identify the most thermodynamically stable complex mentioning the reason: ÇI NH3 H3N- OR H3N NH3 (a) Br H3N- NH3 H3N- -NH3 Co OR HN NH3 H3N NH3 NH3 NH3 (b)
- 9) Reaction of 1 methyl 4-Bromobenzene with fuming HNO3/ H2SO4 yields a tri substituted product. Circle the most stable sigma complex which would yield the product. Br Br Br H NO₂ Br H NO₂ H NO₂ Br H NO₂ + H NO₂(a) Give the IUPAC name for the following complexes: (1) OEC Fe oc/ co OC (ii) CH3 (iv) CH3 H3C. CH3 CH3 As (OC):Os CH3 H3C CH3 Źr (OC)3Os Os(CO)3 Ph Ph-P Ph H2 Ph OEU- CEO2
- Below are the resonance structures of the sigma complex that is formed when the para position of nitrobenzene attacks a nitronium Ton. Which resonance structure is responsible for the instability of this sigma complex (relative to the sigma complex generated from meta-attack). NO₂ 8-6-6 NO₂ NO₂ NO₂ 1 11 01 O II O III O None of the choices are correct. NO₂ NO₂ |||Three peaks are observed at 9000, 14500, 24500 cm-1 in the [Ni(H2O)6]2+ uv-vis spectrum. What is the crystal field stability energy of this complex in kJ/mol? (Ni:28) (h=6.625.10-34Js; c=3.108m/s; 1kJ/mol =83.6 cm-1)Which option indicates, in order, whether the following compounds obey the effective atomic number rule? (27Co, 46Pd, 48Cd, 80Hg) K2 [HgI4], [CdI4] 2-, Co2CO8 (no bridging ligand), [Pd (NH3) 2Cl2] A. does not fit, warn, warn, do not fit B-do not fit, warn, warn, warn C. fits, warn, warn, do not fit D- fits, does not fit, does not fit, does not fit E- fits, does not fit, does not fit, does not fit