The major focus of the crystal field model, the splitting of d orbitals into two sets for an octahedral complex and the two sets of orbitals are to be stated. Also the definition of weak-field ligand, strong-field ligand, low-spin complex and high-spin complex are to be defined. The magnetic behavior of the given complexes and whether they have the same d-orbital splitting diagram are to be explained. Concept introduction: Crystal field theory states the breaking of degenerate orbitals (d or f orbitals) because of the presence of static electric field which is produced by the charge distribution of the neighboring anions. The octahedral complexes are those in which six atoms or ligands are arranged symmetrically around a central metal atom. Paramagnetic complexes are attracted towards the magnetic field and contain unpaired electron whereas diamagnetic complexes have all the electrons paired and hence, repelled from the magnetic field.

Question

How would you use infrared spectroscopy to distinguish between the following pairs of constitutional isomers? (a) CH3C=CCH3 || and CH3CH2C=CH (b) CH3CCH=CHCH3 and CH3CCH2CH=CH2 Problem 12-41 The mass spectrum (a) and the infrared spectrum (b) of an unknown hydrocarbon are shown. Propose as many structures as you can. (a) 100 Relative abundance (%) 80 60 60 40 200 20 (b) 100 Transmittance (%) 10 20 20 80- 60- 40- 20 40 60 80 100 120 140 m/z 500 4000 3500 3000 2500 2000 1500 Wavenumber (cm-1) 1000

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Chapter 21, Problem 6RQ

Interpretation Introduction

Interpretation: The major focus of the crystal field model, the splitting of d orbitals into two sets for an octahedral complex and the two sets of orbitals are to be stated. Also the definition of weak-field ligand, strong-field ligand, low-spin complex and high-spin complex are to be defined. The magnetic behavior of the given complexes and whether they have the same d-orbital splitting diagram are to be explained.

Concept introduction: Crystal field theory states the breaking of degenerate orbitals (d or f orbitals) because of the presence of static electric field which is produced by the charge distribution of the neighboring anions. The octahedral complexes are those in which six atoms or ligands are arranged symmetrically around a central metal atom. Paramagnetic complexes are attracted towards the magnetic field and contain unpaired electron whereas diamagnetic complexes have all the electrons paired and hence, repelled from the magnetic field.

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