pymatgen.core.bonds module¶
This class implements definitions for various kinds of bonds. Typically used in Molecule analysis.
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class
CovalentBond(site1, site2)[source]¶ Bases:
objectDefines a covalent bond between two sites.
Initializes a covalent bond between two sites.
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get_bond_order(tol=0.2, default_bl=None)[source]¶ The bond order according the distance between the two sites :param tol: Relative tolerance to test.
(1 + tol) * the longest bond distance is considered to be the threshold length for a bond to exist. (1 - tol) * the shortest bond distance is considered to be the shortest possible bond length Defaults to 0.2.
- Parameters
default_bl – If a particular type of bond does not exist, use this bond length as a default value (bond order = 1). If None, a ValueError will be thrown.
- Returns
Float value of bond order. For example, for C-C bond in benzene, return 1.7.
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static
is_bonded(site1, site2, tol=0.2, bond_order=None, default_bl=None)[source]¶ Test if two sites are bonded, up to a certain limit. :param site1: First site :type site1: Site :param site2: Second site :type site2: Site :param tol: Relative tolerance to test. Basically, the code
checks if the distance between the sites is less than (1 + tol) * typical bond distances. Defaults to 0.2, i.e., 20% longer.
- Parameters
bond_order – Bond order to test. If None, the code simply checks against all possible bond data. Defaults to None.
default_bl – If a particular type of bond does not exist, use this bond length. If None, a ValueError will be thrown.
- Returns
Boolean indicating whether two sites are bonded.
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get_bond_length(sp1, sp2, bond_order=1)[source]¶ Get the bond length between two species.
- Parameters
sp1 (Specie) – First specie.
sp2 (Specie) – Second specie.
bond_order – For species with different possible bond orders, this allows one to obtain the bond length for a particular bond order. For example, to get the C=C bond length instead of the C-C bond length, this should be set to 2. Defaults to 1.
- Returns
Bond length in Angstrom. If no data is available, the sum of the atomic radius is used.
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get_bond_order(sp1, sp2, dist, tol=0.2, default_bl=None)[source]¶ Calculate the bond order given the distance of 2 species
- Parameters
sp1 (Specie) – First specie.
sp2 (Specie) – Second specie.
dist – Their distance in angstrom
tol (float) – Relative tolerance to test. Basically, the code checks if the distance between the sites is larger than (1 + tol) * the longest bond distance or smaller than (1 - tol) * the shortest bond distance to determine if they are bonded or the distance is too short. Defaults to 0.2.
default_bl – If a particular type of bond does not exist, use this bond length (bond order = 1). If None, a ValueError will be thrown.
- Returns
Float value of bond order. For example, for C-C bond in benzene, return 1.7.