Immobilization of N-oxide functionality into NbO-type MOFs for significantly enhanced C<sub>2</sub>H<sub>2</sub>/CH<sub>4</sub> and CO<sub>2</sub>/CH<sub>4</sub> separations.
Xu, Tingting; Fan, Lihui; Jiang, Zhenzhen; Zhou, Ping; Li, Ziruo; Lu, Huangyan; He, Yabing; Dalton transactions (Cambridge, England : 2003) 49 (2020) 7174–7181; doi:10.1039/d0dt01081b

data_7704343
_publ_section_title
;
 Immobilization of N-oxide functionality into NbO-type MOFs for
 significantly enhanced C<sub>2</sub>H<sub>2</sub>/CH<sub>4</sub> and
 CO<sub>2</sub>/CH<sub>4</sub> separations.
;
_journal_issue                   21
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              7174
_journal_page_last               7181
_journal_paper_doi               10.1039/d0dt01081b
_journal_volume                  49
_journal_year                    2020
_chemical_formula_sum            'C37 H50 Cu2 N6 O16'
_chemical_formula_weight         961.91
_space_group_crystal_system      trigonal
_space_group_IT_number           166
_space_group_name_Hall           '-R 3 2"'
_space_group_name_H-M_alt        'R -3 m :H'
_atom_sites_solution_hydrogens   mixed
_atom_sites_solution_primary     direct
_audit_creation_method
;
FinalCif by Daniel Kratzert, Freiburg 2019,
https://github.com/dkratzert/FinalCif
;
_audit_update_record
;
2020-04-14 deposited with the CCDC.	2020-05-11 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                120
_cell_formula_units_Z            9
_cell_length_a                   18.6199(3)
_cell_length_b                   18.6199(3)
_cell_length_c                   38.2895(8)
_cell_measurement_reflns_used    9902
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      27.49
_cell_measurement_theta_min      2.94
_cell_volume                     11496.5(4)
_computing_structure_refinement  'SHELXL-2018/3 (Sheldrick, 2018)'
_computing_structure_solution    'SHELXT 2018/2'
_diffrn_ambient_environment      N~2~
_diffrn_ambient_temperature      150(2)
_diffrn_detector                 CPAD
_diffrn_detector_area_resol_mean 7.41
_diffrn_detector_type            'Bruker PHOTON II'
_diffrn_measured_fraction_theta_full 0.978
_diffrn_measured_fraction_theta_max 0.981
_diffrn_measurement_device       'three-circle diffractometer'
_diffrn_measurement_device_type  'Bruker D8 VENTURE dual wavelength Mo/Cu'
_diffrn_measurement_method       '\w and \f scans'
_diffrn_measurement_specimen_support 'MiTeGen micromount'
_diffrn_radiation_monochromator  'mirror optics'
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0183
_diffrn_reflns_av_unetI/netI     0.0125
_diffrn_reflns_Laue_measured_fraction_full 0.978
_diffrn_reflns_Laue_measured_fraction_max 0.981
_diffrn_reflns_limit_h_max       23
_diffrn_reflns_limit_h_min       -24
_diffrn_reflns_limit_k_max       24
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       49
_diffrn_reflns_limit_l_min       -37
_diffrn_reflns_number            19677
_diffrn_reflns_point_group_measured_fraction_full 0.978
_diffrn_reflns_point_group_measured_fraction_max 0.981
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         27.494
_diffrn_reflns_theta_min         2.708
_diffrn_source                   'microfocus sealed X-ray tube'
_diffrn_source_type              'Incoatec I\ms'
_exptl_absorpt_coefficient_mu    0.897
_exptl_crystal_colour            blue
_exptl_crystal_density_diffrn    1.250
_exptl_crystal_description       block
_exptl_crystal_F_000             4500
_exptl_crystal_size_max          0.160
_exptl_crystal_size_mid          0.120
_exptl_crystal_size_min          0.110
_refine_diff_density_max         0.736
_refine_diff_density_min         -0.472
_refine_diff_density_rms         0.053
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.078
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     126
_refine_ls_number_reflns         3157
_refine_ls_number_restraints     97
_refine_ls_restrained_S_all      1.078
_refine_ls_R_factor_all          0.0386
_refine_ls_R_factor_gt           0.0366
_refine_ls_shift/su_max          0.076
_refine_ls_shift/su_mean         0.006
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0798P)^2^+10.9266P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1208
_refine_ls_wR_factor_ref         0.1227
_reflns_Friedel_coverage         0.000
_reflns_number_gt                2917
_reflns_number_total             3157
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d0dt01081b2.cif
_cod_data_source_block           ZJNU-19
_cod_depositor_comments
'Adding full bibliography for 7704343--7704345.cif.'
_cod_database_code               7704343
_shelx_shelxl_version_number     2018/3
_shelx_estimated_absorpt_t_min   0.870
_shelx_estimated_absorpt_t_max   0.908
_olex2_diffrn_ambient_temperature_device 'Oxford Cryostream 800'
_shelx_res_checksum              28674
_shelx_fab_checksum              9017