# rmgpy.molecule.AtomType¶

class rmgpy.molecule.AtomType(label='', generic=None, specific=None, single=None, all_double=None, r_double=None, o_double=None, s_double=None, triple=None, quadruple=None, benzene=None, lone_pairs=None, charge=None)

A class for internal representation of atom types. Using unique objects rather than strings allows us to use fast pointer comparisons instead of slow string comparisons, as well as store extra metadata. In particular, we store metadata describing the atom type’s hierarchy with regard to other atom types, and the atom types that can result when various actions involving this atom type are taken. The attributes are:

Attribute

Type

Description

label

str

A unique label for the atom type

generic

list

The atom types that are more generic than this one

specific

list

The atom types that are more specific than this one

increment_bond

list

The atom type(s) that result when an adjacent bond’s order is incremented

decrement_bond

list

The atom type(s) that result when an adjacent bond’s order is decremented

form_bond

list

The atom type(s) that result when a new single bond is formed to this atom type

break_bond

list

The atom type(s) that result when an existing single bond to this atom type is broken

list

The atom type(s) that result when the number of radical electrons is incremented

list

The atom type(s) that result when the number of radical electrons is decremented

increment_lone_pair

list

The atom type(s) that result when the number of lone electron pairs is incremented

decrement_lone_pair

list

The atom type(s) that result when the number of lone electron pairs is decremented

The following features are what are required in a given atomtype. Any int in the list is acceptable. An empty list is a wildcard

single

list

The total number of single bonds on the atom

all_double

list

The total number of double bonds on the atom

r_double

list

The number of double bonds to any non-oxygen, nonsulfur

o_double

list

The number of double bonds to oxygen

s_double

list

The number of double bonds to sulfur

triple

list

The total number of triple bonds on the atom

list

The total number of quadruple bonds on the atom

benzene

list

The total number of benzene bonds on the atom

lone_pairs

list

The number of lone pairs on the atom

charge

list

The partial charge of the atom

all_double

list

Type:

all_double

benzene

list

Type:

benzene

break_bond

list

Type:

break_bond

charge

list

Type:

charge

decrement_bond

list

Type:

decrement_bond

decrement_lone_pair

list

Type:

decrement_lone_pair

list

Type:

equivalent(self, AtomType other) bool

Returns True if two atom types atomType1 and atomType2 are equivalent or False otherwise. This function respects wildcards, e.g. R!H is equivalent to C.

form_bond

list

Type:

form_bond

generic

list

Type:

generic

get_features(self) list

Returns a list of the features that are checked to determine atomtype

increment_bond

list

Type:

increment_bond

increment_lone_pair

list

Type:

increment_lone_pair

list

Type:

is_specific_case_of(self, AtomType other) bool

Returns True if atom type atomType1 is a specific case of atom type atomType2 or False otherwise.

label

unicode

Type:

label

lone_pairs

list

Type:

lone_pairs

o_double

list

Type:

o_double

list

Type:

r_double

list

Type:

r_double

s_double

list

Type:

s_double

single

list

Type:

single

specific

list

Type:

specific

triple

list

Type:

triple

rmgpy.molecule.get_atomtype(atom, dict bonds)

Determine the appropriate atom type for an Atom object atom with local bond structure bonds, a dict containing atom-bond pairs.

The atom type of an atom describes the atom itself and (often) something about the local bond structure around that atom. This is a useful semantic tool for accelerating graph isomorphism queries, and a useful shorthand when specifying molecular substructure patterns via an RMG-style adjacency list.

We define the following basic atom types:

Atom type

Description

General atom types

R

any atom with any local bond structure

R!H

any non-hydrogen atom with any local bond structure

R!H!Val7

any non-hydrogen and non-halogen atom (a non-terminal atom)

Hydrogen atom types

H

hydrogen atom with up to one single bond

Carbon atom types

C

carbon atom with any local bond structure

Ca

carbon atom with two lone pairs and no bonds

Cs

carbon atom with up to four single bonds

Csc

charged carbon atom with up to three single bonds

Cd

carbon atom with one double bond (not to O or S) and up to two single bonds

Cdc

charged carbon atom with one double bond and up to one single bond

CO

carbon atom with one double bond to oxygen and up to two single bonds

CS

carbon atom with one double bond to sulfur and up to two single bonds

Cdd

carbon atom with two double bonds

Ct

carbon atom with one triple bond and up to one single bond

Cb

carbon atom with up to two benzene bonds and up to one single bond

Cbf

carbon atom with three benzene bonds

C2s

carbon atom with one lone pair (valance 2) and up to two single bonds

C2sc

charged carbon atom with one lone pair (valance 2) and up to three single bonds

C2d

carbon atom with one lone pair (valance 2) and one double bond

C2dc

charged carbon atom with one lone pair (valance 2), one double bond and up to one single bond

C2tc

charged carbon atom with one lone pair (valance 2), one triple bond

Nitrogen atom types

N

nitrogen atom with any local bond structure

N0sc

charged nitrogen atom with three lone pairs (valance 0) with up to one single bond

N1s

nitrogen atom with two lone pairs (valance 1) and up to one single bond

N1sc

charged nitrogen atom with two lone pairs (valance 1) up to two single bonds

N1dc

charged nitrogen atom with two lone pairs (valance 1), one double bond

N3s

nitrogen atom with one lone pair (valance 3) with up to three single bonds

N3d

nitrogen atom with one lone pair (valance 3), one double bond and up to one single bond

N3t

nitrogen atom with one lone pair (valance 3) and one triple bond

N3b

nitrogen atom with one lone pair (valance 3) and two benzene bonds

N5sc

charged nitrogen atom with no lone pairs (valance 5) with up to four single bonds

N5dc

charged nitrogen atom with no lone pairs (valance 5), one double bond and up to two single bonds

N5ddc

charged nitrogen atom with with no lone pairs (valance 5) and two double bonds

N5dddc

charged nitrogen atom with with no lone pairs (valance 5) and three double bonds

N5tc

charged nitrogen atom with with no lone pairs (valance 5), one triple bond and up to one single bond

N5b

nitrogen atom with with no lone pairs (valance 5) and two benzene bonds (one of the lone pairs also participates in the aromatic bond) and up to one single bond

N5bd

nitrogen atom with with no lone pairs (valance 5), two benzene bonds, and one double bond

Oxygen atom types

O

oxygen atom with any local bond structure

Oa

oxygen atom with three lone pairs and no bonds

O0sc

charged oxygen with three lone pairs (valance 0) and up to one single bond

O0dc

charged oxygen atom with three lone pairs (valance 0) and one double bond

O2s

oxygen atom with two lone pairs (valance 2) and up to two single bonds

O2sc

charged oxygen atom with two lone pairs (valance 2) and up to one single bond

O2d

oxygen atom with two lone pairs (valance 2) and one doubel bond

O4sc

charged oxygen atom with one one pair (valance 4) and up to three single bonds

O4dc

charged oxygen atom with one one pair (valance 4), one double bond and up to one single bond

O4tc

charged oxygen atom with one one pair (valance 4) and one triple bond

O4b

oxygen atom with one one pair (valance 4) and and two benzene bonds

Silicon atom types

Si

silicon atom with any local bond structure

Sis

silicon atom with four single bonds

Sid

silicon atom with one double bond (to carbon) and two single bonds

SiO

silicon atom with one double bond (to oxygen) and two single bonds

Sidd

silicon atom with two double bonds

Sit

silicon atom with one triple bond and one single bond

Sib

silicon atom with two benzene bonds and one single bond

Sibf

silicon atom with three benzene bonds

Phosphorus atom types

P

phosphorus atom with any local bond structure

P0sc

charged phosphorus atom with three lone pairs (valence 0) and up to 1 single bond

P1s

phosphorus atom with two lone pairs (valence 1) and up to 1 single bond

P1sc

charged phosphorus atom with two lone pairs (valence 1) and up to 2 single bonds

P1dc

charged phosphorus atom with two lone pairs (valence 1) and 1 double bond

P3s

phosphorus atom with one lone pair (valence 3) and up to 3 single bonds

P3d

phosphorus atom with one lone pair (valence 3), 1 double bond and up to 1 single bond

P3t

phosphorus atom with one lone pair (valence 3) and 1 triple bond

P3b

phosphorus atom with one lone pair (valence 3) and 2 benzene bonds

P5s

phosphorus atom with no lone pairs (valence 5) and up to 5 single bonds

P5sc

charged phosphorus atom with no lone pairs (valence 5) and up to 6 single bonds

P5d

phosphorus atom with no lone pairs (valence 5), 1 double bond and up to 3 single bonds

P5dd

phosphorus atom with no lone pairs (valence 5), 2 double bonds and up to 1 single bond

P5dc

charged phosphorus atom with no lone pairs (valence 5), 1 double bond and up to 2 single bonds

P5ddc

charged phosphorus atom with no lone pairs (valence 5) and 2 double bonds

P5t

phosphorus atom with no lone pairs (valence 5), 1 triple bond and up to 2 single bonds

P5td

phosphorus atom with no lone pairs (valence 5), 1 triple bond and 1 double bond

P5tc

charged phosphorus atom with no lone pairs (valence 5), 1 triple bond and up to 1 single bond

P5b

phosphorus atom with no lone pairs (valence 5), 2 benzene bonds and up to 1 single bond

P5bd

phosphorus atom with no lone pairs (valence 5), 2 benzene bonds and 1 double bond

Sulfur atom types

S

sulfur atom with any local bond structure

Sa

sulfur atom with three lone pairs and no bonds

S0sc

charged sulfur atom with three lone pairs (valance 0) and up to one single bonds

S2s

sulfur atom with two lone pairs (valance 2) and up to two single bonds

S2sc

charged sulfur atom with two lone pairs (valance 2) and up to three single bonds

S2d

sulfur atom with two lone pairs (valance 2) and one double bond

S2dc

charged sulfur atom with two lone pairs (valance 2), one double bond and up to one single bond

S2tc

charged sulfur atom with two lone pairs (valance 2) and one triple bond

S4s

sulfur atom with one lone pair (valance 4) and up to four single bonds

S4sc

charged sulfur atom with one lone pair (valance 4) and up to five single bonds

S4d

sulfur atom with one lone pair (valance 4), one double bond and up to two single bonds

S4dd

sulfur atom with one lone pair (valance 4) and two double bonds

S4dc

charged sulfur atom with one lone pair (valance 4), one to three double bonds and up to three single bonds

S4b

sulfur atom with one lone pair (valance 4) and two benzene bonds (one of the lone pairs also participates in the aromatic bond)

S4t

sulfur atom with one lone pair (valance 4), one triple bond and up to one single bond

S4tdc

charged sulfur atom with one lone pair (valance 4) one to two triple bonds, up to two double bonds, and up to three single bonds

S6s

sulfur atom with no lone pairs (valance 6) and up to six single bonds

S6sc

charged sulfur atom with no lone pairs (valance 6) and up to seven single bonds

S6d

sulfur atom with no lone pairs (valance 6), one double bond and up to four single bonds

S6dd

sulfur atom with no lone pairs (valance 6), two double bonds and up to two single bonds

S6ddd

sulfur atom with no lone pairs (valance 6) and three double bonds

S6dc

charged sulfur atom with no lone pairs (valance 6), one to three double bonds and up to five single bonds

S6t

sulfur atom with no lone pairs (valance 6), one triple bond and up to three single bonds

S6td

sulfur atom with no lone pairs (valance 6), one triple bond, one double bond and up to one single bond

S6tt

sulfur atom with no lone pairs (valance 6) and two triple bonds

S6tdc

charged sulfur atom with no lone pairs (valance 6), one to two triple bonds, up to two double bonds, and up to four single bonds

Chlorine atom types

Cl

chlorine atom with any local bond structure

Cl1s

chlorine atom with three lone pairs and zero to one single bonds

Bromine atom types

Br

bromine atom with any local bond structure

Br1s

bromine atom with three lone pairs and zero to one single bonds

Iodine atom types

I

iodine atom with any local bond structure

I1s

iodine atom with three lone pairs and zero to one single bonds

Fluorine atom types

F

fluorine atom with any local bond structure

F1s

fluorine atom with three lone pairs and zero to one single bonds