Calculating the coordination numbers for different atomic sites¶

The Structure class of the strct sub-package can be used to determine the coordination number of periodic and non-periodic structures using different methods, all of them described here: doi:10.1021/acs.inorgchem.0c02996.

First, we create an object of the class and import a structure:

[1]:
from aim2dat.strct import Structure

strct = Structure.from_file("files/zif8_structure/ZIF-8.cif", label="ZIF-8")

Three different methods are implemented to calculate the coordination numbers:

  • "minimum_distance": The distance of the closest atom is taken as reference. All atoms inbetween that distance and a relative margin are considered as neighbours of the atomic site. The relative margin can be set via the attribute minimum_distance_delta, the default value is 0.1.

  • "econ": The effective coordination number algorithm is an iterative method. Two parameters can be changed to tweak the method: econ_tolerance and econ_conv_threshold with the default values of 0.5 and 0.001, respectively.

  • "okeeffe": The method developed by O’Keeffe is based on the Voronoi tessellation and thereby computationally a bit more demanding than the previous methods. The attribute okeeffe_weight_threshold can be set and acts as threshold for the solid angle of the Voronoi facets. Its default value is set to 0.5.

The coordination numbers for each site can then be readily calculated using the methods calculate_coordination:

[2]:
strct.calculate_coordination()
[2]:
{'distance_avg': {('Zn', 'N'): 1.9651884952153824,
  ('C', 'N'): 1.3481992499546553,
  ('N', 'C'): 1.3734536168260307,
  ('C', 'H'): 0.9482500804509107,
  ('H', 'C'): 0.9482500804509109},
 'distance_stdev': {('Zn', 'N'): 8.612455701839897e-06,
  ('C', 'N'): 6.170252041246332e-06,
  ('N', 'C'): 0.02552161688364479,
  ('C', 'H'): 0.01490735862562007,
  ('H', 'C'): 0.014907358625619952},
 'distance_max': {('Zn', 'N'): 1.9652020658995912,
  ('C', 'N'): 1.3482095142807609,
  ('N', 'C'): 1.398712990170384,
  ('C', 'H'): 0.9612687439831057,
  ('H', 'C'): 0.9612687439831057},
 'distance_min': {('Zn', 'N'): 1.9651805961901716,
  ('C', 'N'): 1.3481940221322792,
  ('N', 'C'): 1.3481940221322792,
  ('C', 'H'): 0.9301526896173402,
  ('H', 'C'): 0.9301526896173401},
 'nrs_avg': {('Zn', 'Zn'): 0,
  ('Zn', 'C'): 0,
  ('Zn', 'N'): 4,
  ('Zn', 'H'): 0,
  ('C', 'Zn'): 0,
  ('C', 'C'): 0,
  ('C', 'N'): 0.5,
  ('C', 'H'): 1.25,
  ('N', 'Zn'): 0,
  ('N', 'C'): 2,
  ('N', 'N'): 0,
  ('N', 'H'): 0,
  ('H', 'Zn'): 0,
  ('H', 'C'): 1,
  ('H', 'N'): 0,
  ('H', 'H'): 0},
 'nrs_stdev': {('Zn', 'Zn'): 0.0,
  ('Zn', 'C'): 0.0,
  ('Zn', 'N'): 0.0,
  ('Zn', 'H'): 0.0,
  ('C', 'Zn'): 0.0,
  ('C', 'C'): 0.0,
  ('C', 'N'): 0.8751899489873673,
  ('C', 'H'): 1.1012565357112796,
  ('N', 'Zn'): 0.0,
  ('N', 'C'): 0.0,
  ('N', 'N'): 0.0,
  ('N', 'H'): 0.0,
  ('H', 'Zn'): 0.0,
  ('H', 'C'): 0.0,
  ('H', 'N'): 0.0,
  ('H', 'H'): 0.0},
 'nrs_max': {('Zn', 'Zn'): 0,
  ('Zn', 'C'): 0,
  ('Zn', 'N'): 4,
  ('Zn', 'H'): 0,
  ('C', 'Zn'): 0,
  ('C', 'C'): 0,
  ('C', 'N'): 2,
  ('C', 'H'): 3,
  ('N', 'Zn'): 0,
  ('N', 'C'): 2,
  ('N', 'N'): 0,
  ('N', 'H'): 0,
  ('H', 'Zn'): 0,
  ('H', 'C'): 1,
  ('H', 'N'): 0,
  ('H', 'H'): 0},
 'nrs_min': {('Zn', 'Zn'): 0,
  ('Zn', 'C'): 0,
  ('Zn', 'N'): 4,
  ('Zn', 'H'): 0,
  ('C', 'Zn'): 0,
  ('C', 'C'): 0,
  ('C', 'N'): 0,
  ('C', 'H'): 0,
  ('N', 'Zn'): 0,
  ('N', 'C'): 2,
  ('N', 'N'): 0,
  ('N', 'H'): 0,
  ('H', 'Zn'): 0,
  ('H', 'C'): 1,
  ('H', 'N'): 0,
  ('H', 'H'): 0},
 'sites': [{'Zn': 0,
   'C': 0,
   'N': 4,
   'H': 0,
   'element': 'Zn',
   'kind': None,
   'position': [7.296689736497134, 5.619566364689632e-05, 5.957730332583271],
   'neighbours': [{'element': 'N',
     'kind': None,
     'site_index': 18,
     'distance': 1.9651889528071236,
     'position': [9.157826390914545, 0.07298329121481956, 6.58448356357103]},
    {'element': 'N',
     'kind': None,
     'site_index': 19,
     'distance': 1.9651805961901723,
     'position': [6.745065666789741, 1.7790519935249622, 5.330977101595511]},
    {'element': 'N',
     'kind': None,
     'site_index': 32,
     'distance': 1.9651823659646426,
     'position': [6.130206305553247, -0.5640371384649034, 7.435247455063922]},
    {'element': 'N',
     'kind': None,
     'site_index': 33,
     'distance': 1.9652020658995908,
     'position': [7.153660582731001, -1.2877733636202902, 4.48021321010262]}],
   'total_cn': 4,
   'min_dist': 1.9651805961901723,
   'max_dist': 1.9652020658995908,
   'avg_dist': 1.9651884952153824},
  {'Zn': 0,
   'C': 0,
   'N': 4,
   'H': 0,
   'element': 'Zn',
   'kind': None,
   'position': [-2.4321504391714384, 6.879413154848223, 5.957730332583271],
   'neighbours': [{'element': 'N',
     'kind': None,
     'site_index': 20,
     'distance': 1.9651823659646415,
     'position': [-2.575159883634991, 5.591611468613456, 7.435247455063922]},
    {'element': 'N',
     'kind': None,
     'site_index': 21,
     'distance': 1.9652020658995908,
     'position': [-3.5986535794179053, 6.315291947670503, 4.48021321010262]},
    {'element': 'N',
     'kind': None,
     'site_index': 30,
     'distance': 1.9651889528071242,
     'position': [-2.983766148319832, 8.65842077627717, 6.58448356357103]},
    {'element': 'N',
     'kind': None,
     'site_index': 31,
     'distance': 1.9651805961901716,
     'position': [-0.5710221453130249, 6.952328426831764, 5.330977101595511]}],
   'total_cn': 4,
   'min_dist': 1.9651805961901716,
   'max_dist': 1.9652020658995908,
   'avg_dist': 1.965188495215382},
  {'Zn': 0,
   'C': 0,
   'N': 4,
   'H': 0,
   'element': 'Zn',
   'kind': None,
   'position': [2.4322696486628486, 8.599224296812542, 2.9788651662916354],
   'neighbours': [{'element': 'N',
     'kind': None,
     'site_index': 22,
     'distance': 1.9651889528071258,
     'position': [2.289265226892534, 10.522696054166493, 3.3553937233108986]},
    {'element': 'N',
     'kind': None,
     'site_index': 23,
     'distance': 1.9651805961901718,
     'position': [1.2657828798532025, 7.601729114037491, 4.206157614803789]},
    {'element': 'N',
     'kind': None,
     'site_index': 40,
     'distance': 1.9651823659646426,
     'position': [4.293401280387023, 8.019984801067077, 3.229089840260133]},
    {'element': 'N',
     'kind': None,
     'site_index': 41,
     'distance': 1.9652020658995903,
     'position': [1.8806292075186353, 8.252487217979114, 1.1248194867917216]}],
   'total_cn': 4,
   'min_dist': 1.9651805961901718,
   'max_dist': 1.9652020658995903,
   'avg_dist': 1.9651884952153826},
  {'Zn': 0,
   'C': 0,
   'N': 4,
   'H': 0,
   'element': 'Zn',
   'kind': None,
   'position': [2.4322696486628486, -1.7197549463006727, 8.936595498874906],
   'neighbours': [{'element': 'N',
     'kind': None,
     'site_index': 24,
     'distance': 1.9651823659646437,
     'position': [4.293401280387023, -1.2134378256706302, 8.560066941855643]},
    {'element': 'N',
     'kind': None,
     'site_index': 25,
     'distance': 1.9652020658995908,
     'position': [1.8806292075186355, -3.1520486415096127, 7.709303050362752]},
    {'element': 'N',
     'kind': None,
     'site_index': 38,
     'distance': 1.9651889528071236,
     'position': [2.289265226892534, -2.3553900412388, 10.79064117837482]},
    {'element': 'N',
     'kind': None,
     'site_index': 39,
     'distance': 1.9651805961901723,
     'position': [1.265782879853203,
      -0.15814327678364726,
      8.686370824906408]}],
   'total_cn': 4,
   'min_dist': 1.9651805961901723,
   'max_dist': 1.9652020658995908,
   'avg_dist': 1.9651884952153824},
  {'Zn': 0,
   'C': 0,
   'N': 4,
   'H': 0,
   'element': 'Zn',
   'kind': None,
   'position': [-2.4321504391714384, 1.7199235332916143, 8.936595498874906],
   'neighbours': [{'element': 'N',
     'kind': None,
     'site_index': 26,
     'distance': 1.9651889528071236,
     'position': [-2.983766148319832, 1.3732214306392387, 10.79064117837482]},
    {'element': 'N',
     'kind': None,
     'site_index': 27,
     'distance': 1.9651805961901718,
     'position': [-0.5710221453130249, 1.1406793171104, 8.686370824906408]},
    {'element': 'N',
     'kind': None,
     'site_index': 36,
     'distance': 1.9651823659646417,
     'position': [-2.575159883634991, 3.643388187513678, 8.560066941855643]},
    {'element': 'N',
     'kind': None,
     'site_index': 37,
     'distance': 1.9652020658995912,
     'position': [-3.5986535794179053,
      0.7224051979031391,
      7.709303050362752]}],
   'total_cn': 4,
   'min_dist': 1.9651805961901718,
   'max_dist': 1.9652020658995912,
   'avg_dist': 1.965188495215382},
  {'Zn': 0,
   'C': 0,
   'N': 4,
   'H': 0,
   'element': 'Zn',
   'kind': None,
   'position': [7.296689736497135, 5.1595458172202555, 2.9788651662916354],
   'neighbours': [{'element': 'N',
     'kind': None,
     'site_index': 28,
     'distance': 1.9651823659646417,
     'position': [6.130206305553249, 6.721162207173027, 3.229089840260133]},
    {'element': 'N',
     'kind': None,
     'site_index': 29,
     'distance': 1.9652020658995906,
     'position': [7.1536605827310025, 4.523875746101074, 1.1248194867917216]},
    {'element': 'N',
     'kind': None,
     'site_index': 34,
     'distance': 1.9651889528071247,
     'position': [9.157826390914547, 5.665870040982182, 3.3553937233108986]},
    {'element': 'N',
     'kind': None,
     'site_index': 35,
     'distance': 1.965180596190172,
     'position': [6.745065666789744, 3.727275274624738, 4.206157614803789]}],
   'total_cn': 4,
   'min_dist': 1.965180596190172,
   'max_dist': 1.9652020658995906,
   'avg_dist': 1.9651884952153822},
  {'Zn': 0,
   'C': 0,
   'N': 2,
   'H': 0,
   'element': 'C',
   'kind': None,
   'position': [-4.915942783061324, 0.9170890105215702, 7.4983993965893045],
   'neighbours': [{'element': 'N',
     'kind': None,
     'site_index': 18,
     'distance': 1.3482095142807609,
     'position': [-5.435473609085451, 0.0729832912148195, 6.58448356357103]},
    {'element': 'N',
     'kind': None,
     'site_index': 37,
     'distance': 1.3481961964440305,
     'position': [-3.598653579417905, 0.7224051979031391, 7.709303050362752]}],
   'total_cn': 2,
   'min_dist': 1.3481961964440305,
   'max_dist': 1.3482095142807609,
   'avg_dist': 1.3482028553623957},
  {'Zn': 0,
   'C': 0,
   'N': 2,
   'H': 0,
   'element': 'C',
   'kind': None,
   'position': [7.367710007518636, 2.55021928823475, 4.417061268577236],
   'neighbours': [{'element': 'N',
     'kind': None,
     'site_index': 19,
     'distance': 1.34819402213228,
     'position': [6.7450656667897455, 1.7790519935249627, 5.330977101595511]},
    {'element': 'N',
     'kind': None,
     'site_index': 35,
     'distance': 1.3481940221322792,
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   'total_cn': 2,
   'min_dist': 1.3481940221322792,
   'max_dist': 1.34819402213228,
   'avg_dist': 1.3481940221322795},
  {'Zn': 0,
   'C': 0,
   'N': 2,
   'H': 0,
   'element': 'C',
   'kind': None,
   'position': [-2.40004584674459, 4.2563276871616935, 7.3720955135385395],
   'neighbours': [{'element': 'N',
     'kind': None,
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     'distance': 1.348197266961551,
     'position': [-2.5751598836349907, 5.591611468613456, 7.435247455063922]},
    {'element': 'N',
     'kind': None,
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     'distance': 1.3481972669615494,
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   'total_cn': 2,
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   'max_dist': 1.348197266961551,
   'avg_dist': 1.34819726696155},
  {'Zn': 0,
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   'N': 2,
   'H': 0,
   'element': 'C',
   'kind': None,
   'position': [-4.915942783061324, 6.035302715105725, 4.543365151628002],
   'neighbours': [{'element': 'N',
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   'total_cn': 2,
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   'max_dist': 1.3482095142807602,
   'avg_dist': 1.3482028553623953},
  {'Zn': 0,
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   'N': 2,
   'H': 0,
   'element': 'C',
   'kind': None,
   'position': [7.328775462035145, -2.6230559537239815, 4.543365151628002],
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   'avg_dist': 1.3482028553623957},
  {'Zn': 0,
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   'H': 0,
   'element': 'C',
   'kind': None,
   'position': [-0.051503510446218856, 7.796416905308908, 4.417061268577236],
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Based on the coordination numbers and distances two atomic sites can be compared using the StructureOperations class:

[3]:
from aim2dat.strct import StructureCollection, StructureOperations

strct_op = StructureOperations(StructureCollection([strct]))
strct_op.compare_sites_via_coordination("ZIF-8", "ZIF-8", 0, 1)
[3]:
True