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Chapter 23: Problem 30

Indicate the likely coordination number of the metal in each of the following complexes: (a) $\left[\mathrm{Ru}(\text { bipy })_{3}\right]\left(\mathrm{NO}_{3}\right)_{2}$ (b) $\operatorname{Re}(\text { o-phen })_{2}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{2}$ (c) \(\mathrm{Pd}(\mathrm{PPh} 3)_{3} \mathrm{Cl}\) (d) \(\left(\mathrm{NH}_{4}\right)_{2} \mathrm{Mn}(\mathrm{EDTA})\)

Short Answer

Expert verified
The likely coordination numbers of the metal ions in the given complexes are: (a) Ru: 3, (b) Re: 4, (c) Pd: 4, (d) Mn: 6.

Step by step solution

01

a) Coordination number of Ru in \([\mathrm{Ru}(\text { bipy })_{3}]\left(\mathrm{NO}_{3}\right)_{2}\)

First, identify the metal ion: This complex contains the metal ion Ru. The surrounding ligands are bipy (2,2'-bipyridine) and there are three of them as indicated by the subscript 3. Since the complex has three bipy ligands, the coordination number of Ru is 3.
02

b) Coordination number of Re in \(\operatorname{Re}(\text { o-phen })_{2}\left(\mathrm{C}_{2}\mathrm{O}_{4}\right)_{2}\)

First, identify the metal ion: This complex contains the metal ion Re. The surrounding ligands are o-phen (ortho-phenanthroline) and oxalate ion \((\mathrm{C}_{2}\mathrm{O}_{4})\). There are two o-phen ligands and two oxalate ligands. Since there are total of four ligands, the coordination number of Re is 4.
03

c) Coordination number of Pd in \(\mathrm{Pd}(\mathrm{PPh} 3)_{3} \mathrm{Cl}\)

First, identify the metal ion: This complex contains the metal ion Pd. The surrounding ligands are PPh3 (triphenylphosphine) and a Cl ion. There are three PPh3 ligands and one Cl ligand. Since there are total of four ligands, the coordination number of Pd is 4.
04

d) Coordination number of Mn in \((\mathrm{NH}_{4})_{2} \mathrm{Mn}(\mathrm{EDTA})\)

First, identify the metal ion: This complex contains the metal ion Mn. The surrounding ligand is EDTA (ethylenediaminetetraacetic acid). There is one EDTA ligand, but it can bond to the metal ion in six distinct places. Since there is one ligand (EDTA) with six bonding sites, the coordination number of Mn is 6. In conclusion, the likely coordination numbers of the metal ions in the complexes are: (a) Ru: 3 (b) Re: 4 (c) Pd: 4 (d) Mn: 6

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Most popular questions from this chapter

Which species are more likely to act as ligands? (a) Positively charged ions or negatively charged ions? (b) Neutral molecules that are polar or those that are nonpolar?

Consider the following three complexes: \(\left(\right.\) Complex 1) $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{SCN}\right]^{2+}$ \(\left(\right.\) Complex 2) $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{3} \mathrm{Cl}_{3}\right]^{2+}$ \(\left(\right.\) Complex 3) \(\mathrm{CoClBr} \cdot 5 \mathrm{NH}_{3}\) Which of the three complexes can have (a) geometric isomers, (b) linkage isomers, (c) optical isomers, (d) coordination-sphere isomers?

A Zn electrode is immersed in a solution that is \(1.00 \mathrm{M}\) in \(\left[\mathrm{Zn}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}\) and $1.00 \mathrm{M}\( in \)\mathrm{NH}_{3}$. When the cathode is a standard hydrogen electrode, the emf of the cell is found to be \(+1.04 \mathrm{~V}\). What is the formation constant for \(\left[\mathrm{Zn}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+} ?\)

(a) If a complex absorbs light at \(610 \mathrm{nm},\) what color would you expect the complex to be? (b) What is the energy in joules of a photon with a wavelength of \(610 \mathrm{nm}\) ? (c) What is the energy of this absorption in \(\mathrm{kJ} / \mathrm{mol} ?\)

Polydentate ligands can vary in the number of coordination positions they occupy. In each of the following, identify the polydentate ligand present and indicate the probable number of coordination positions it occupies: (a) \(\operatorname{Cr}(\mathrm{EDTA})^{-}\) (b) $\left[\mathrm{Ni}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)\left(\mathrm{H}_{2} \mathrm{O}\right)_{2}\right] \mathrm{Br}_{2}$ (c) $\left[\mathrm{Ru}(\mathrm{en})\left(\mathrm{NH}_{3}\right)_{4}\right] \mathrm{Cl}_{3}$ (d) \(\mathrm{K}_{2}\left[\mathrm{Fe}(\mathrm{O}\) -phen \()(\mathrm{CN})_{4}\right]\)
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