For the following structure derived from a tetrahedral Ni(CO)4, please determine the number of infrared and Raman bands for their CO groups. (Please note: Modes with translational symmetry (x, y, z) will be infrared active while modes with xy, xz, yz, x2, y2 or z2 symmetry are Raman active.)

what kind of electronic transitions are responsible for the colours of the following species? For each case, state the type of the electronic transition, the orbitals between which the transition occurs and briefly explain the reason for your assignment.

2) Which of the following 3 compounds will have the highest CO stretching frequency in the IR? What does this indicate (the metal is electron-rich or electron-deficient)? a) b) Me3 Pl Me3P MOCO CO PMe3 c) (MeO) 3 Pl (MeO)3P со Ph3Pl.. Ph3P CO P(OMe)3 Moco PPh 3

n 1982, F. A. Cotton and D. J. Darensbourg published a paper in Inorganic Chemistry (v21, pp. 2661-2666) describing the kinetics of isomerization of cis/trans-Mo(CO)4(PR): complexes. One of the pure isomers (A) gave rise to 4 CO stretching bands. Upon heating, the other isomer (B) began to form and a single new CO stretching band appeared. A: 4 CO stretching bands (2019, 1922, 1905, and 1899 cm) B: I CO stretching band (1895 cm) y R₂P PR3 OC-Mo R active modes for cis: CO OC CO cis C₂v ос R₂P Mo OC PR₂ trans Dah For both isomers shown above (cis C and trans Das), determine how the CO bond vectors transform under the symmetry operations of their respective point groups to generate the reducible representations for CO bond stretching. (Please use the coordinate system given to the left.) trans: CO CO Reduce the l'co representations into their component irreducible representations to determine the number and symmetry of the CO stretching modes for the cis and trans isomers. "sing the…

Would the coordination step between Br- and (CH3)3C+ be allowed if Br- were to approach from within the plane of the central C? Explain.

3. Transition metals of the periodic table are known to adopt either a tetrahedral or square planar configuration when it has a coordination number of 4. Consider the inorganic complex ZrI4. a) Draw the structure, determine all symmetry elements and operations, and assign point group classification of Zr14 if it is tetrahedral, and square planar. (10 pts) b) If Zrl is tetrahedral, how many IR absorption peaks is expected given its point group classification? (2 pts) c) If Zrl4 is square planar, how many IR absorption peaks is expected given its point group (2 pts) classification? d) The IR spectrum of gaseous Zrl4 shows absorption peaks at 55 cm-1 and 245 cm-1. This data is consistent with what shape of ZrI4. (2 pts)

1. Using the MO scheme provided below, calculate the bond order for the ligand-metal bonds in a ML6 complex where M=Co2+ and NH3: Recall that independent of the ligand, the eg orbitals that are 10Dq above the t2g orbitals are always o*. M ML6 6L O* 4p d,?.? d,? 2 х - у 4s 3d dy dyz dyz sp3 Op Os

The mating energy of the [CoF6]3- ion is 21000 cm−1, and ∆0 is 13000 cm−1. By calculating the KAKE of both the low and high spin states of the complex, determine in which state the compound is more stable.

What type of stochiometric defect is shown by (i) ZnS and (ii) CsCl?

(b) Ni(CO) 3 (PMe3) has C3, symmetry. Using the information provided below determine how many v(CO) bands would you expect to observe in its infra-red (IR) and Raman spectra respectively? C3v E 2 C3(z) 30v A₁ 1 1 1 z x²+y² z² A₂ 1 1 -1 E 2 -1 0 (x,y) (x²-y²,xy), (xz,yz)