Crystallography

· Point Group Symmetry

· A Hypertext Book of Crystallographic Space Group Diagrams and Tables

· Crystallography Open Database

· Effective Ionic Radii

Organic Reactions
· Simple Huckel Molecular Orbital (SHMO) Calculator

· Graphical Index of Organic Chemistry Reactions

· Not Voodoo

· Common Bond Enthalpies

· List of Common Solvent Properties

· Evans pKa Tables

· Bordwell pKa Table (Acidity in DMSO)

· Molarities of Concentrated Acids and Bases

· SDBS: Spectral Database for Organic Compounds

· Common NMR Solvent Impurities

Molecular Magnetism 

· Molecular Magnetism Web

· A Few Basics of Magnetism

· Hund’s Rule, Pauli Exclusion Principle, and Exchange Coupling

· Zero-Field Splitting (zfs)

· Overview of EPR (excerpt from Kay Sandberg’s Dissertation)

· Superexchange and Double Exchange

Molecular Electronics

Magnetic and electronic structure database

·MAGNDATA: A Collection of magnetic structures with portable cif-type files

·Topological Antiferromagnetic Materials Database.

Magnetic group theory analysis tools

·Magnetic Group Tables，1-, 2- and 3-Dimensional Magnetic Subperiodic Groups and Magnetic Space Groups，Daniel B. Litvin

·Magnetic Point Group Tables

·Magnetic Space Groups

·Magnetic group symmetry judgment website: Findsym

Common materials database website

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1. Crystal structure database:

ICSD (commercial database): https://icsd.fiz-karlsruhe.de/index.xhtml

Springer materials: https://materials.springer.com/

2. Electronic structure database:

AFLOW： http://www.aflowlib.org/

Material Project： https://materialsproject.org/

3. Topology material database:

Materiae ： http://materiae.iphy.ac.cn/#/

Topological Materials Arsenal： https://ccmp.nju.edu.cn/

Topological Materials Database: http://topologicalquantumchemistry.org/#/

4. Two dimensional material:

Materials Cloud： https://www.materialscloud.org/discover/2dstructures/dashboard/ptable

2D Materials： https://materialsweb.org/twodmaterials

Nano lett. 17, 1915 (2017) article and attachments: https://pubs.acs.org/doi/abs/10.1021/acs.nanolett.6b05229

Chem. SOC. Rev. 43, 6537 (2014) articles and annexes: http://pubs.rsc.org/en/content/articlehtml/2014/cs/c4cs00102h

5. Superconducting material database

Class I superconductors: http://www.superconductors.org/Type1.htm

Class II superconductors: http://www.superconductors.org/Type2.htm

6. Magnetic structure database

MAGNDATA: http://webbdcrista1.ehu.es/magndata/index.php?show_db=1

7. Phonon spectrum

phonondb@kyoto-u: http://phonondb.mtl.kyoto-u.ac.jp/index.html