SIC3021 Inorganic Chemistry III Laboratory Manual

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Questions and Answers

What does a positive magnetic susceptibility indicate about a material?

It is always diamagnetic.

It can be paramagnetic or ferromagnetic. (correct)

It is not affected by magnetic fields.

It has all paired electrons.

Which method is used for measuring magnetic susceptibility in solids?

Evans’ method

SQUID technique

Gouy method (correct)

NMR spectroscopy

What is true about transition metals regarding their magnetic properties?

They have completely filled d subshells.

They have at least one incomplete d subshell. (correct)

They are always diamagnetic.

They cannot exhibit paramagnetism.

How are magnetic properties used in the study of compounds?

To characterize systems like alloys and coordination complexes. Signup and view all the answers

What does the number of unpaired electrons in a transition metal indicate?

The oxidation state and electron configuration. Signup and view all the answers

What role do superconducting loops play in SQUID magnetometers?

They are used to measure extremely subtle magnetic fields. Signup and view all the answers

What is the purpose of adding acetylacetone during the preparation procedure?

To provide a stabilizing ligand. Signup and view all the answers

At what temperature is the mixture heated during the preparation of the manganese complex?

60°C Signup and view all the answers

What is one of the main pharmacological utilities of phosphine-based compounds?

Antiviral agents Signup and view all the answers

What role do tertiary phosphine complexes play in catalysis?

They serve as homogeneous catalysts. Signup and view all the answers

Why is nickel catalysis considered appealing?

It is cost-effective. Signup and view all the answers

During the synthesis of dichlorobis(triphenylphosphino)nickel(II), what is the first step involving triphenylphosphine?

Melting it in a water bath Signup and view all the answers

In the preparation process of the Schiff base, what is the role of salicyldehyde?

It serves as a ligand. Signup and view all the answers

What is a significant safety precaution mentioned in the synthesis of nickel(II) complex?

Handle glacial acetic acid with care. Signup and view all the answers

What analytical techniques are suggested for characterizing the prepared Schiff base?

IR and 1H NMR Signup and view all the answers

What byproduct must be removed after synthesizing dichlorobis(triphenylphosphino)nickel(II)?

Triphenylphosphine Signup and view all the answers

What should be done before re-precipitating the complex after dissolving the chelate?

Filter the solution Signup and view all the answers

Which solvent should be subtracted from the frequency shift to correct for diamagnetism?

Warm toluene Signup and view all the answers

What is the diamagnetic correction value for Carbon (aromatic)?

6.24 Signup and view all the answers

At equilibrium, what relationship holds between the effective magnetic moment (µeff) and molar magnetic susceptibility (χM)?

µeff = constant x χM Signup and view all the answers

Which of the following complexes can be determined using tert-butanol methyl resonance as a reference?

Fe(CN)6^3- in aqueous solution Signup and view all the answers

What is the first step to calculate magnetic susceptibility in solution?

Prepare a pure solvent capillary reference Signup and view all the answers

Which element has the highest diamagnetic correction value according to the provided data?

Ni2+ Signup and view all the answers

In the Tanabe-Sugano diagrams, what are these diagrams used to depict?

Energies of electronic states as a function of ligand field strength Signup and view all the answers

What is essential to understand before applying the spin-only formula to calculate the effective magnetic moment?

The complex must contain unpaired electrons Signup and view all the answers

Which option represents a common mistake when referencing magnetic susceptibility in organic solvents?

Using a solvent with unpaired electrons as reference Signup and view all the answers

What is the effective magnetic moment (µeff) for a tetrahedral [Ni(salen)2] complex in solution as mentioned?

3.3 Signup and view all the answers

What is necessary for calculating ꭕM and ꭕMcorr in relation to the complex magnetic properties?

The diamagnetic correction for ligands must be included Signup and view all the answers

What is the diamagnetic correction value for Oxygen in the context of alcohol?

-4.61 Signup and view all the answers

What role does the capillary tube with pure CHCl3 serve in NMR analysis?

It provides a reference for chemical shifts Signup and view all the answers

Calculate the effective magnetic moment (µeff) from the given observations if the molar susceptibility (χM) is assumed to have a certain constant. Which formula is correct?

µeff = K x χM Signup and view all the answers

What is the diamagnetic correction value for Carbon in general, not specifically for the aromatic form?

-6.00 Signup and view all the answers

What is the relationship between mass susceptibility and density?

Mass susceptibility introduces a density factor inversely. Signup and view all the answers

What is typically the best measurement to compare different materials' magnetism?

Molar susceptibility Signup and view all the answers

What is magnetic susceptibility defined as?

The ratio of the intensity of magnetism induced in a substance to the magnetizing force. Signup and view all the answers

Which formula correctly represents the calculation for corrected molar susceptibility?

χ Μcorr = χ exp - χdia Signup and view all the answers

Which methods are traditionally used to measure magnetic susceptibility?

Gouy and Faraday methods. Signup and view all the answers

How is effective magnetic moment, µeff, calculated?

µeff = √n(n + 2) B.M. Signup and view all the answers

What happens to the effective magnetic moment in a system adhering to Curie law?

There is no or negligible orbital contribution. Signup and view all the answers

What advantage did Professor Evans's innovative method provide?

The shift from measuring weight changes to detecting force on a magnet. Signup and view all the answers

Which model of magnetic susceptibility balance is mentioned as being used in the laboratory?

MSB-AUTO Signup and view all the answers

What is the main purpose of knowing the molecular weight, MW, in the context of susceptibility?

To convert χg to χM. Signup and view all the answers

Which method is primarily used to obtain a χg value from χν?

Inputting sample length and weight into the Auto. Signup and view all the answers

How is volume susceptibility typically expressed?

As the ratio of the intensity of magnetism to the volume of the sample. Signup and view all the answers

What is suggested for cleaning difficult residue in sample tubes?

Conventional detergents and strong acids. Signup and view all the answers

Which of the following statements about the measurement of magnetic susceptibility is incorrect?

The variety of methods evolved include only digital systems. Signup and view all the answers

What are the three common ways magnetic susceptibility values are expressed?

Volume, mass, and molar. Signup and view all the answers

What can lead to variability in volume susceptibility measurements?

Changes in the density of the substance. Signup and view all the answers

Study Notes

Laboratory Manual

SIC3021 Practical of Inorganic Chemistry III
This is a laboratory manual for a course at Universiti Malaya
The manual covers different experiments
Includes synthesis of Nickel complexes with mixed ligand systems

Experiment 1: Synthesis of Nickel complex with mixed ligand system
Experiment 2: Preparation and characterization of mesitylenetricarbonylmolybdenum(0)
Experiment 3: Magnetic susceptibility
Experiment 4: Electronic spectra of Nickel(II) complexes
Each experiment has a specific page number

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Description

This laboratory manual is designed for the SIC3021 course at Universiti Malaya, covering key experiments in Inorganic Chemistry. It includes detailed procedures for synthesizing various Nickel complexes and their characterization techniques, making it an essential resource for students. Each experiment is organized with specific page numbers for easy navigation.