The concept of bond-stretch isomerization was a debated topic in the inorganic literaturethroughout the 1970's and 1980's. The best example of this concept is that of mer-MoOCl2(PMe2Ph)3. Single crystal XRD showed two unique bond distances for the M=O doublebond and IR data showed two unique stretching frequencies, suggesting that two isomers ofthe complex existed with two unique M=O bond distances. However, this idea didn't sit wellwith many inorganic chemists as it seemed to defy our understanding of chemical bonding. Inthe 1990's, the concept of bond-stretch isomers was finally debunked with the help of higherresolution instrumentation. Read Gerard Parkin's Acc. Chem. Res. article on the topic andexplain how XRD, IR, and 'H-NMR experiments were used in combination to unravel themystery.

X-ray diffraction (XRD) is a powerful technique for finding crystalline material, crystal lattice…

Answered: The concept of bond-stretch…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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According to the IR spectroscopy results of [Co(NH3)5ONO]Cl2 and [Co(NH3)5NO2]Cl2 complexes, the symmetrical and asymmetrical NO stretching vibrations found for one of the complexes (I) are 1315 and 1430 cm-1, respectively, for the other complex (II). these values are 1065 and 1430 cm-1, respectively. According to the data, complex (I) is …………… and complex (II) is ………….
Determine the symmetry point groups of the mer- and fac- isomers of the complex [Re(CO)3(NCMe)3] and deduce the irreducible symmetry representations generated by the three stretching vibrations of the C triple bond to N ligands in each of the isomers. [Regard NCMe as a linear ligand.] Also for each isomer discussed, state with reasoning which vibrations are IR active, and which are Raman active and how many bands will be observable in IR and Raman spectra. How can you distinguish the two isomers using their vibrational spectra?
q) AlCl3 forms a dimer in the gas phase, the structure of which is shown below. Determine all the symmetry elements and identify its symmetry point group. Justify graphically q) Determine the symmetry representations of CO stretching vibrations of a Mn(CO)5Br complex, which has a pseudo-octahedral structure with CO ligands at five corners and a Br ligand at the sixth corner. Which of the CO stretching vibrations are active in IR absorption and which in Raman spectra? Justify graphically
By using the given 1) electronic absorption spectrum, 2) the Tanabo-Sugano diagram for d3 complex in octahedral ligand field and 3) the absorption/emission spectra, explain the following: a) Ligand field states (to support your explanation show the filling of the orbitals) b) Radiative transitions (to support your explanation refer to fluorescence, phosphorescence and Stokes’ shift)
The [CrCl6]^3- ion has a maximum in its absorption spectrum at 735 nm. Calculate the crystal field splitting energy (in kJ/mol ) for this ion.
Consider the octahedral complex [FeBr6] 4−. In water solution it has an absorption peak at 864 nm with a molar absorptivity (ε) of 3.6 L mol-1 cm-1 . (a) What is the energy (in wavenumbers, cm-1 ) of the absorption peak? Show all work
[Co(NH3)6]2+ has Δo = 10,100 cm-1 and B=920 cm-2. How many electronic absorptions do you expect for the complex and at what energies in kJ.mol-1 are these absorptions? Which type of irradiacion is absorbed?
Describe the IR active symmetric and asymmetric Pt-Cl stretching vibrations for cis-[Pt(NH3)2Cl2] ans trans-[Pt(NH3)2Cl2]complexes. ???
Calculate ∆ in kJ/mol if a d1 complex has an absorption maximum at 545 nm.
For [Co(NH3)6]2+ ΔO = 10100 cm-1 and B = 920 cm-1. How many electronic absorption peaks do you expect for the complex and at what energy in kJ.mol-1 are these absorptions? Which type of irradiation is absorbed?
(a) Reaction of [Fe(H2O)6]2+ with three equivalents of 1,10-phenanthroline (phen) produces a complex containing the [Fe(phen)3]2+ ion. Predict the spin states of [Fe(H2O)6]2+ and [Fe(phen)3]2+ and explain any processes that could cause the spin states to differ.
Given the Tanabe-Sugano diagram below for a d3 complex.Which of the following transitions corresponds to the ∆o?A.4A2g → 4T1g (F)B. 4T2g → 4T1g (P) C.4A2g → 4T1g (P) D.4A2g → 4T2g

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