Search Networks

S-net 'sqc---' Number
Known Net Name	Nodes per Unit Cell
Spacegroup	Nodes per Asymmetric Unit
Vertex Degree(s)	Chiral Y N Long vectors Y N
Coordination Sequences

Guide to Searching Networks

S-net Number

select a unique S-net by its number, or select a range of nets with a hyphen, eg. 100-200 would select sqc100 to sqc200 inclusive

Known Nets

The following inputs will search EPINET for networks whose equilibrium placement is identicial with nets found by others:

• 3-letter codes of the Reticular Chemistry Structure Resource (RCSR) or the TOPOS database (TOPOS)
• Standard 3-letter codes for zeolites, listed at Zeolites). ("zeo" will yield all zeolite nets.)
• sphere-packing signatures of Werner Fischer and Elke Koch (e.g. "5/4/t6"). Inputting "5/" will give all nets identified by Fischer and Koch as 5-coordinated sphere packings);
• Some of Alan Wells' net names listed in "Three Dimensional Nets and Polyhedra" (John Wiley and Sons 1977).
• Common chemical structure types (e.g. "diamond", "cristobalite", "ice VI")

Spacegroup Searching

There is now functionality for sorting on Spacegroups. You can sort by spacegroup number (1 to 230), a numerical range of spacegroups (eg. 7-19), a spacegroup name (eg. R-3c) or finally a symmetry class, from the following list (numerical indexes in brackets);

• triclinic (1,2)
• monoclinic (3,15)
• orthorhombic (16,74)
• tetragonal (75,142)
• rhombohedral (143,167)
• hexagonal (168,194)
• cubic (195,230)

General Input

Empty fields match all - if you search with no input, you will get all networks.
Different fields match together with AND.
Multiple targets in a single field typically match together with AND, except for mutually exclusive classes (eg. multiple spacegroups). Chiral and Long Vectors are boolean Y or N (or Blank for ANY).
Coordination sequences are given by a string of numbers one line per sequence - match as little or as much as you want...eg;

Coordination Sequences:
3 5 8
4 8 13

Exclusive Matching

A standard match, for instance;

Vertex Degree: 3 4

Will get all vertex degrees containing both 3 and 4 so {3,4,5} would be a match.

To get all tilings with only a particular vertex degree and no other, use the ONLY keyword eg.

3 4 ONLY

will match tilings with degrees {3,4} or {4,3} or {3,3,4} but never {3,4,5}}

Substring Matching

You can do tighter matches on the Vertex degree, eg;

Vertex Degree: 4,5

will match on any Vertex Degrees containing this ordered substring. To match an exact signature, use brackets, eg:

Vertex Degree: {4,5}

This is an ordered search, so it won't match on {5,4}

Negation

Vertex searching admits the Negation operator '^'. To exclude a particular vertex from a match, eg,

Vertex Degrees: 4 8 ^3

will find all matching vertex sizes with 4 and 8 but not 3. This also applies to substring searching, eg.

Vertex Degrees: ^{4,5} will match everything but {4,5}