Ruthenium(III) ions, $$$\mathrm{Ru}^{3+}$$$, form an octahedral complex, $$$\left[\mathrm{Ru}(d p y s)_{2} \mathrm{C} l_{2}\right]^{+}$$$, with the ligands dpys and chloride ions. This complex shows the same kind of stereoisomerism as $$$\left[\mathrm{Ru}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{Cl}_{2}\right]^{+}$$$but also shows a different type of stereoisomerism. (i) Complete the three-dimensional diagrams in Fig. 4.3 to show the three different stereoisomers of $$$\left[\mathrm{Ru}(d p y s)_{2} \mathrm{Cl} l_{2}\right]^{+}$$$. The dpys ligand can be represented using $$$N \quad N$$$. (ii) State the different types of stereoisomerism shown by $$$\left[\mathrm{Ru}(d p y s)_{2} \mathrm{Cl}_{2}\right]^{+}$$$. ................................................................................................................................. (iii) Deduce which stereoisomers in (e)(i) are non-polar. Explain your answer. ....................................................................................................................................... . .................................................................................................................................

Chemistry

IGCSE&ALevel

CAIE

Exam No：9701_s24_qp_42 Year：2024 Question No：4(e)

Answer:

Knowledge points:

29.4.1 understand that enantiomers have identical physical and chemical properties apart from their ability to rotate plane polarised light and their potential biological activity

29.4.2 understand and use the terms optically active and racemic mixture

29.4.3 describe the effect on plane polarised light of the two optical isomers of a single substance

29.4.4.1 the potential different biological activity of the two enantiomers

29.4.4.2 the need to separate a racemic mixture into two pure enantiomers

29.4.4.3 the use of chiral catalysts to produce a single pure optical isomer (Candidates should appreciate that compounds can contain more than one chiral centre, but knowledge of meso compounds and nomenclature such as diastereoisomers is not required.)

3.5.1.1 $\mathrm{BF}_{3} \text { (trigonal planar, } 120^{\circ} \text { ) }$

3.5.1.2 $\left.\mathrm{CO}_{2} \text { (linear, } 180^{\circ}\right)$

3.5.1.3 $\mathrm{CH}_{4} \text { (tetrahedral, 109.5°) }$

3.5.1.4 $\mathrm{NH}_{3} \text { (pyramidal, 107°) }$

3.5.1.5 $\mathrm{H}_{2} \mathrm{O} \text { (non-linear, } 104.5^{\circ})$

3.5.1.6 $\mathrm{SF}_{6} \text { (octahedral, 90°) }$

3.5.1.7 $\mathrm{SF}_{6} \text { (octahedral, 90°) }$

3.5.2 predict the shapes of, and bond angles in, molecules and ions analogous to those specified in 3.5.1

Answer:

Knowledge points:

Solution:

Related Question