lchm1251b  2019-2020  Louvain-la-Neuve

Note from June 29, 2020
Although we do not yet know how long the social distancing related to the Covid-19 pandemic will last, and regardless of the changes that had to be made in the evaluation of the June 2020 session in relation to what is provided for in this learning unit description, new learnig unit evaluation methods may still be adopted by the teachers; details of these methods have been - or will be - communicated to the students by the teachers, as soon as possible.
4 credits
30.0 h + 10.0 h
Filinchuk Yaroslav;
knowledge of basic algebra

The prerequisite(s) for this Teaching Unit (Unité d’enseignement – UE) for the programmes/courses that offer this Teaching Unit are specified at the end of this sheet.
Main themes
- Symmetry Elements
- Crystal lattice
- Point Groups
- Space groups
- Use of the International Tables for Crystallography
- Principles of diffraction, reciprocal space
- Intensity diffracted by a crystal
- Single-crystal diffraction, powder diffraction
- Experimental methods and instruments
- Information obtained from the diffraction
- Introduction to structural chemistry, contribution of crystallography to chemistry knowledge

At the end of this learning unit, the student is able to :

1 - understanding the symmetry and in particular of the molecular symmetry
- understanding the foundations of modern crystallographic analysis and results they deliver

The contribution of this Teaching Unit to the development and command of the skills and learning outcomes of the programme(s) can be accessed at the end of this sheet, in the section entitled “Programmes/courses offering this Teaching Unit”.
1.             Introduction, molecules and crystals, symmetry elements
2.             Point groups, chirality
3.             Translation, planar groups, lattice, elements of periodic symmetry
4.             Space groups, International Tables for Crystallography
5.             X-rays, neutrons, principles of diffraction, reciprocal space
6.             Structure factor, Fourier synthesis, phase problem
7.             Diffraction methods: single crystal and powder diffraction
8.             Information obtained by diffraction
9.             Solution and refinement of crystal structures
10.          Introduction to modern software (Crysalis, Fullprof, Shelx, Fox)
11.           Use and presentation of results, interpretation of literature data
12.           Introduction to structural chemistry
13.           In-situ studies: Chemistry by diffraction
14.           "large facilities instruments" - synchrotrons and neutron sources: the great opportunities
15.           Character tables, irreducible representations
Teaching methods
The course is taught with the use of PowerPoint slides, available at iCampus. The lecture course also includes demonstration software and the use of interactive material. Exercises are provided to facilitate the understanding.
Evaluation methods
oral exam with a written preparation. It includes two theoretical questions: one with and one without a written preparation (15 points). The practical part is examined by the engineer, Dr. Koen Robeyns, and is evaluated with a maximum of 5 points. One more point students can get for the creative home work (the task is given).
Other information
Skills to be acquired:
- understanding the symmetry and in particular of the molecular symmetry
- understanding the foundations of modern crystallographic analysis and results they deliver
Online resources interactive guide to molecular symmetry crystallography on a mobile phone, 2D periodic groups collection of useful links electronic crystallography course

1.     J.-J. Rousseau, A. Gibaud, Cristallographie géométrique et radiocristallographie (Dunod, 3e édition, 2007).
2.     R. Tilley, Crystals and crystal structures (Wiley, 2006).
Faculty or entity

Programmes / formations proposant cette unité d'enseignement (UE)

Title of the programme
Master [120] in Chemistry

Master [120] in Biochemistry and Molecular and Cell Biology

Master [60] in Chemistry

Bachelor in Chemistry

Minor in Chemistry