Consider the following electronic transition frequencies (in $\mathrm{cm}^{-1}$ ) for a series of nickel till complexes (uma = dimethylacetamide):
Determine appropriate values of $\Delta_{e}$ and $B$ ' for these complexes.

Chai Santi

Numerade Educator

11:44

Problem 22

The following absorption bands are found in the spectrum of $[\mathrm{Cr} \mathrm{CN}]_{2} \mathrm{J}^{3-}: 264 \mathrm{nm}$ (charge tronsfer). $310 \mathrm{nm}$, and $378 \mathrm{nm}$. Determine the values of $\mathrm{A}_{\mathrm{e}}$ and $\overrightarrow{\boldsymbol{B}}$.

Maria Gabriela Cota Moreira

Numerade Educator

01:21

Problem 23

When visible light passes through a solution of nickel(ll) sulfute, a green solution results. What are the spin allowed transitions responsible for this color? Would you expect a Jahn-Teller distortion for this complex?

Aadit Sharma

Numerade Educator

01:24

Problem 24

Chromium(II) flucride and manganese(II) fuoride both have a central metal ion surrounded by six fivoride ligands. The Mn- $F$ bond lengths are couidistint, but four of the Cr- $F$ distances are lone and two are short. Provide an explanation.

Adriano Chikande

Numerade Educator

03:04

Problem 25

If a molecule having a center of symmetry undergoes a Jahn-Teller distortion, the center of symmetry must be maintrined, and this is the case when octahedra underso tetragonul Uistonions. Can you think of any other distortion of an octahedral complex that would be consistent with this principle?

Vishal Sharma

Numerade Educator

02:04

Problem 26

Both FeF $_{2}$ and $\mathrm{K}$, $\left[\mathrm{CoF}_{n}\right]$ contain six-coordinste high spin metal ions. The electronic spectrum of the former shows absorptions at 6990 and $10.660 \mathrm{cm}^{-1}$, while the lutter has absorptions at 10.200 and $14.500 \mathrm{cm}^{-1}$. For which complex is $\Delta$, largest? Why? How many multiplicity allowed electronic transitions would you expect for these complexes? How can you account for the presence of two bands in each spectrum?

Aadit Sharma

Numerade Educator

01:13

Problem 27

The ligand-to-metal charge transfer bunds increase in energy in the series: $| C$ ol $, 1^{-}<$ $\left|\mathrm{CoBr}_{a}\right|^{-}<| \mathrm{CoClal}^{-},$ Explain

Aadit Sharma

Numerade Educator

02:32

Problem 28

Explain the following (from Lever, A. B. P. J. Chem , Educ. $1974,5 \%$. $612-616$ :
a. The anhydrous solids CuCly and CuBryare green and black, respectively. while Culz is not stable.
b. The NCS ion is a good colorimetric reagent for Feflll).
c. Complexes in which two metals of different oxidation state are close together are frequently highly colored.
d. Many complexes exhibiting charge transfer bonds in the visible region are unstable in sunlight.

Aadit Sharma

Numerade Educator

03:26

Problem 29

From the reaction of NiBry and $\mathrm{Ph}_{2} \mathrm{EtP}$. it is possible to isolate green crystals of INifPh $_{2}$ Et $P_{2}$ Brel. which have a magnetic moment of 3.20 Bohr magnetons, and red crystals of [NifPh_EtPh,Br_]. which have a magnetic moment of zero. When either of these is dissolved in dichloromethane at $40^{\circ} \mathrm{C}$, the resulting solution has a magnetic moment of 2.69 BM. Suggest siructures for the green and red crystals and offer an explanation for the solution magnetic moment. (See LaMar, $G$. N.: Sherman, E. O. $J$. Am. Chem. Sece. 1970.92,2691

Keshav Singh

Numerade Educator

04:45

Problem 30

Calculate the magnetic moment of Dy $\left\{S O_{4},-8 H_{2} O\right.$}

Kumari Shilpi

Numerade Educator

02:20

Problem 31

Show the the grand static term of $\mathrm{Er}^{3+}$ is $^{4} \mathrm{I}_{18 / 2}$. What megnetic moment would you expect for $\mathrm{Er}_{3}\left(\mathrm{SO}_{4}\right)_{3}-8 \mathrm{f}_{2} \mathrm{O}^{4}$.

Edward Downes

Numerade Educator

01:38

Problem 32

The complexes $\left[\mathrm{Mn}\left(\mathrm{H}, \mathrm{O} \mathrm{I}_{\mathrm{A}}\right)^{>+},\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{n}\right]^{3+} \cdot\left[\mathrm{MnCl}_{2}\right]^{2-}, \text { and }\left[\mathrm{Fe} \mathrm{Cl}_{4}\right]\right.$ all have magnetic moments of nearly 5.92 BM. What does this tell you about the geometric and electronic structures of these complexes? Why is the spin-only formula so precise in these cases?

Lottie Adams

Numerade Educator

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Problem 33

Ore means of determining the magnetic susceptibility of a transition metal complex. the Evans method, utilizes NMR. As an illustration of the procedure, consider the following experiment utilizing a $60-\mathrm{MHz}$ spectrometer, A copilary tube is filled with an aqueous solution consisting of $8.0 \mathrm{mg} \mathrm{mL}^{-1}$ of $\mathrm{CuSO}_{4}$ in $2 \%$ t-butyl alcohol. The capiliary tube is sealed and placed in un NMR tube that also contains a $2 \%$, butyl alcohol solution with no CuSO, The volume susceptibilitics of the two solutions differ and as a result the $t$ -butyl group shows a different prosoo chemical shin in cach. For ihis particular experiment, the chemicul shift of the $t$ butyl group in the copper solution is $8.6 \mathrm{Hz}$ upficid from that in the noncopper solution at $310 \mathrm{K}$. Use these dats and help from Loliger, J. . Scheffold. $\boldsymbol{R}$. $\boldsymbol{J}$. Chem. Ednc. $1972.49 .646-647$, to determine the magnetic moment of CuSO, How does the value you obtain compare to that expected from the spin-only formula?

Victor Salazar

Numerade Educator

01:02

Problem 34

Explain the following experimental results: At ambient temperature a $0.192-8$ sample of FelHB(l-pyrazolylbls weighs the same in a magnetic ficid as it does out of the field to three significant figures). However, in an identical magnetic ficld at $449 \mathrm{K},$ a $0.192-\mathrm{g}$ sample of the same material gains 0.015 g over its out-of-ficld weight. (See Hutchinson, B. Hunce. R. $L$. Hardewree, E. L. Russell $S$. A. $J$. Chem. Educ. $1980.57,830-831.1$

Narayan Hari

Numerade Educator

02:08

Problem 35

When ethylenediumine is added to a solution of cobalt (II) chloride hexahydrale in concentrated hydrochloric acid, a Huc crystulline solid is obtained in $80 \%$ yield. Analysis of this compound shows that is contains $14.16 \%$ N. $12.13 \%$ C. $5.09 \%$ H, and $53.70 \%$ Cl. The effective magnetic moment is measured as $4.6 \mathrm{BM}$. The blue complex dissotves in water is give a pink solution, the conductivity of which is 852 ohm $^{-1} \mathrm{cm}^{2} \mathrm{mol}^{-1}$ at $25^{\circ} \mathrm{C}$. The visible spectrum of a drnso solution of the complex has bands centered at 3217.5610 . and $15.150 \mathrm{cm}^{-1}$ tmolar absorptivity $=590 \mathrm{mol}^{-1} \mathrm{L} \mathrm{cm}^{-1}$, but for a wrater solution, the absorptions occur at $8000 .-16.000$ and $19.400 \mathrm{cm}^{-1}$ fmolar absorptivity $=5 \mathrm{mol}^{-1} \mathrm{L} \mathrm{cm}^{-1}$ ). In a titration with sodium hydroxide, cach mole of the complex neutralizes four moles of base, Determine the formula and structure of the complex. Account for all reactions and obscruations.

David Collins

Numerade Educator

02:01

Problem 36

Addition of TiCla to an aqueous solution of urea followed by addition of KI gave deep blue crystals of a complex containing titanium, urea, and iodine. The visible spectrum of the material showed one absorption at $18.070 \mathrm{cm}^{-1}$ and its magnetic moment was determined to be $1.76 \mathrm{BM}$. When $1.000 \mathrm{g}$ of the compound was decomposed at high temperatures in an oxygen atmosphere, all ligands volatilizcd and $0.101 \mathrm{g}$ of $\mathrm{TiO}_{2}$ formed. Deduce the formula and siructure of the complex. Do you think urea or water lies higher in the spectrochemical series? How might you determine whether urea is bound to titanium through oxygen or through nitrogen?

David Collins

Numerade Educator

01:04

Problem 37

In the solid state, Cotpybla is violet and has a magnetic moment of $5.5 \mathrm{BM}$, but a $\mathrm{CH}_{2} \mathrm{Cl}_{2}$ solution of this compound is blue and has a maganetic moment of $4.42 \mathrm{BM}$. In contrast, Cotpyla Bra is blue in both the solid state and in a CH,Cl solution and has a megnetic moment of 4.6 BM in both forms. Explain these observations. Predict the colors and magnetic moments of Col2-MepylaCl, and Cotpylal

Hunza Gilgit

Numerade Educator

01:55

Problem 38

It has becn known at least since the 15 th century that blue glass could be obtained by including cobalt (II) in the formulation. Aside from its beauty, this type of glass is useful For absorbing sodium emission therchy allowing one to observe the characteristic flame Icst for potassium in the presence of sodium. Explain. Low alkali borate glasses containing cobali(il) do not give good cobalt blue-they tend to be pink. Addition of some NaCl to the glass deepens the blue color. Why? (Paul. A. Chemistry of Glasses, 2 nd ed. Chapman and Hall: London, 1990 : pp 323 fl.

Rashmi Sinha

Numerade Educator

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