Inorganic Chemistry: Electronic Structure


3035) Using the Tanabe-Sugano diagram below for the d2 electronic configuration, how many spin-allowed transitions would be expected in the electronic absorption spectrum?

0, 1, 2, 3

3036) Demonstration: A 1M Mn2+ solution [Mn(H2O)6]2+ in a large pathlength container is observed to be very pale pink in color (almost colorless).

From the Tanabe - Sugano diagram below, the electronic transitions for this Mn complex lie on which side of the vertical line?

left, right

3057) All octahedral (Oh) and tetrahedral (Td) complexes with d1 and d9 electronic configurations have 2T2(g) or 2E(g) ground states. This typifies the relationship that the Oh dn energy level diagram is the same as that for:

Td dn, Td d10-n


3037) After showing that the ground state term symbols of d1 and d2 free ions are 2D and 3F, respectively, which of the following statements is true for other transition metal free ions?

dn and d10-n have the same ground state term symbol, dn and d10-n do not have the same ground state term symbol

3038) There are how many d electrons in the [Mn(H2O)6]2+ complex?

5, 6, 7

3039) From crystal field theory, which set of d orbitals is higher in energy in an Oh complex?

eg, t2g


In a Td complex?

e, t2

3040) Using the character table below, to what irreducible representation(s) do the d-orbitals belong in a tetrahedral complex?

A1, A2, E, T1, T2






3041) In the Td molecule MX4, the A1 vibrational mode corresponds to all the M-X bonds stretching the same distance simultaneously. With which spectroscopic technique is this vibrational mode observable?

IR, Raman, neither, both



Which of the following salts (high spin for paramagnetic samples) will have the strongest attraction to a magnet?

MnSO4, CoSO4, ZnSO4


Demonstration: Capsules of each of these materials are suspended from a thread. Bringing a strong magnet close to each capsule will produce the largest response from the Mn sample (5 unpaired electrons), next largest response from the Co sample (3 unpaired electrons), and negligible response from the Zn sample (diamagnetic).

3042) Demonstration:

[Ni(H2O)6]2+ (green) + NH3 ---> blue complex
[Ni(H2O)6]2+ (green) + en ---> violet complex


From this kind of "eyeball spectroscopy," which ligand gives rise to the largest D0 value (d-orbital splitting)?

H2O, NH3, en

3043) If V(CO)6 is an 18-electron complex, what is the charge on the complex, if any?

+1, 0, -1

3044) In constructing an MO diagram for CO, for which element are the 2p atomic orbitals at higher energy?

C, O

3045) In a metal carbonyl complex, as more electron density moves from the metal d-orbitals to the CO pi* orbital (d --> pi*), what happens to the CO stretching frequency?

it increases, it decreases, it stays the same

3046) In the neutral complex Fe(h5-C5H5)2, is the 18-electron rule obeyed?

Yes, No

3047) For the unbalanced reaction:

ReO4- + HCl --H2--> (reduction) [Re2Cl8]2-


What is the oxidation state of the Re atoms in the product?

II, III, IV

3048) Photo-excitation promotes an electron from the HOMO (highest occupied molecular orbital) to the LUMO (lowest unoccupied molecular orbital) of a molecule (see diagram below). Which is the stronger oxidant?

ground state, excited state


Which is the stronger reductant?

ground state, excited state





3058) Although pure diamonds are colorless, some diamonds have color because of dopants. The Hope diamond, for example, is blue due to nitrogen (N) dopants. Based on its position in the periodic table, N in diamond acts as a(n):

donor, acceptor


Complete the equilibrium reaction shown below for this dopant:


The charge on the product ion is:

positive, negative


The ionization of N leads to the production of a(n):

electron, hole



Which arrow shown below represents the electronic transition corresponding to the ionization of N?

A, B



According to LeChatlier's Principle, adding boron (an acceptor) to N-doped diamond will shift the equilibrium of equation 1 toward the:

products, reactants


(A similar set of questions could be asked about doping with B, which can produce yellow diamonds.)

 



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