User:Benjah-bmm27/degree/3/MFH

=Crystallography, MFH=

Texts

 * Otterbein College: learn molecular symmetry with Jmol
 * Werner Massa, Crystal Structure Determination (2004)
 * Bill (William) Clegg, Crystal Structure Determination (Oxford Chemistry Primer) (1998)
 * Book review: Acta Cryst. (2007). A63, 483
 * Book review: Acta Cryst. (2007). A63, 483
 * Book review: Acta Cryst. (2007). A63, 483

Topics

 * Crystallography
 * Structural analysis

Unit cells, lattices and symmetry

 * Molecular structure and crystal structure
 * Crystal shapes, including symmetry axes
 * Calcite — cubic
 * Molybdenite — hexagonal
 * Diamond — cubic

Crystal symmetry

 * Symmetry
 * Point symmetry
 * Translational symmetry
 * Symmetry groups
 * In one dimension: 7 frieze groups
 * In two dimensions: 17 wallpaper groups
 * In three dimensions: 230 space groups (list)
 * Crystallographic restriction theorem — cannot have 5-fold rotation symmetry in crystal lattices (pentagons don't tessellate)
 * Symmetry elements in crystallography
 * Hermann–Mauguin notation
 * Screw axes
 * Glide planes

Crystal systems

 * 7 crystal systems

Bravais lattices

 * 14 Bravais lattices

Miller indices

 * Lattice planes
 * Miller indices (hkl) and all that - http://www.doitpoms.ac.uk/tlplib/miller_indices/index.php

Bragg's law

 * Bragg's law
 * Bragg diffraction

Misc

 * Structure factor
 * Patterson function
 * X-ray notation
 * Fractional coordinates

Solving the Phase Problem, Refinement of the Solution and Interpretation of the Results

 * Direct methods
 * Structure refinement
 * R-factors
 * Measurement errors
 * Weighting
 * Accuracy of results

A cautionary tale: the quest for cyclopentadienyl cation

 * Cyclopentadienyl cation, [C5H5]+
 * Pentamethylcyclopentadienyl cation, [C5Me5]+, AKA [Cp*]+, should be stable, thought they'd determined a crystal structure containing it
 * Turned out to be the pentamethylcyclopentenyl cation, [(CMe)3(CHMe)2]+
 * http://www.benjamin-mills.com/chemistry/structures/Cp*-cation/