Electronic spectra in coordination chemistry
The most intense absorption band in the visible spectrum of [Mn(H20)6}2+ is at 24,900 cm-1 and has a molar absorptivity of 0.038 mol -1 cm-1. What concetration of [Mn(h20)6]2+ would be necessary yto give an abosorbance of 0.10 in a cell of path length 1.00
Electronic spectra in coordination chemistry
For the isoelectronic series[V(CO)6]-, Cr(CO)6, and [Mn(Co)6]+, does the energy of the metal to ligand charge-transfer bands increase or decrease with increasing charge on the complex? Why?
Electronic spectrain coordination chemistry
An aqeuous solutino of Ni(No3)2 is green.Addition of aqueous solution Nh3 causes the color of the solution to change blue. If the ethylenediamine is added to the green solution,the color changesto violet. What causes the colors of these complexes, how do these colors relate to the epected positions of these ligands in the spect ...continues
Practice Exam - Frontier Orbitals; Self Dissociation; Formation of Halogen Cation, etc ...
1. Explain the following, with suitable examples: a. Frontier orbitals b. A 3-center 2e- bond c. Tendency of P to form d pi -p pi bond d. Self dissociation of ammonia e. Formation of halogen cation **Please see attachment for proper citation of symbols.
Practice Exam - MO Theory vs. Valence Bond Theory; Conductivity
2. (a) How does MO theory differ from Valence bond theory? (b) Explain how the above concepts of MO theory are applied to rationalize the conductivity of : i. metals ii. (SN)x [a polymer] iii. semiconductors
Practice Exam - Boron Halides; Radius Ratio Rule; Monomer vs. Dimer; Viscosity; Zeolites
3. Explain why: a. Lewis acid strengths of boron halides are in the order BBr3 >> BCl3 > BF3 opposite to the order expected based on electronegativities. b. Radius ratio rule is correct only 66% of the times in predicting coordination numbers in ionic compounds. c. Me3B is a monomer, whereas Me3Al exits as a dimer. d. Vis ...continues
This is a past exam for practice. Please complete question 5 only. 20 5. Write brief notes on any four of the following: a. Metal-organic vapor phase epitaxy b. Berry's rotation. c. Effect of polarization on melting points d. IR spectroscopy as a tool for structure determination of inorganic compounds e. Rochow pr ...continues
Ligands in organometallic chemistry
2. The following table lists infrared (IR) carbonyl stretching frequencies for three organometallic complexes. Explain why the infrared frequencies increase as one proceeds down the series. [V(CO)6] - 1860 cm-1 [Cr(CO)6] 2000 cm-1 [Mn(CO)6]+ 2090 cm-1
Count the number of valence electrons associated with each metal in the list below. Determine if they obey the 18-electron rule. If they violate the 18-electron rule, comment on the stability/reactivity of the complexes. a) [V(CO)6] b) cis-[Rh(Br)(CO)2(PPh3)] c) [Fe2(CO)4(Cp)2] d) [Mn(CO)5(CH3)]
How many signals from the CO ligands do you expect to see in the 13C NMR spectrum of each of these complexes? Explain. a) [V(CO)6] b) cis-[Rh(Br)(CO)2(PPh3)] c) [Fe2(CO)4(Cp)2] d) [Mn(CO)5(CH3)]
