Ferro- or antiferromagnetism? Heisenberg chains in the crystal structures of verdazyl radicals.
Eusterwiemann, Steffen; Doerenkamp, Carsten; Dresselhaus, Thomas; Janka, Oliver; Daniliuc, Constantin G.; Pöttgen, Rainer; Studer, Armido; Eckert, Hellmut; Neugebauer, Johannes; Physical chemistry chemical physics : PCCP 20 (2018) 22902–22908; doi:10.1039/c8cp03332c

data_7231448
_publ_section_title
;
 Ferro- or antiferromagnetism? Heisenberg chains in the crystal structures
 of verdazyl radicals.
;
_journal_issue                   35
_journal_name_full               'Physical chemistry chemical physics : PCCP'
_journal_page_first              22902
_journal_page_last               22908
_journal_paper_doi               10.1039/c8cp03332c
_journal_volume                  20
_journal_year                    2018
_chemical_formula_sum            'C16 H11 N4 O'
_chemical_formula_weight         275.29
_space_group_crystal_system      orthorhombic
_space_group_IT_number           33
_space_group_name_Hall           'P 2c -2n'
_space_group_name_H-M_alt        'P n a 21'
_symmetry_space_group_name_Hall  'P 2c -2n'
_symmetry_space_group_name_H-M   'P n a 21'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           'APEX3 v2016.1-0'
_audit_update_record
;
2018-08-14 deposited with the CCDC.
2018-08-17 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   17.0182(6)
_cell_length_b                   20.5047(7)
_cell_length_c                   3.86780(10)
_cell_measurement_reflns_used    1827
_cell_measurement_temperature    223.(2)
_cell_measurement_theta_max      68.25
_cell_measurement_theta_min      0.88
_cell_volume                     1349.68(7)
_computing_cell_refinement       'Collect (Nonius B.V., 1998)'
_computing_data_collection
;
Collect (Nonius B.V., 1998)
;
_computing_data_reduction        'Denzo-SMN (Otwinowski & Minor, 1997)'
_computing_molecular_graphics    'XP (Sheldrick, 2014)'
_computing_publication_material  'SHELXL-2014/7 (Sheldrick, 2014)'
_computing_structure_refinement  'SHELXS-97 (Sheldrick, 1990)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      223.(2)
_diffrn_measured_fraction_theta_full 0.975
_diffrn_measured_fraction_theta_max 0.975
_diffrn_measurement_device_type  'Nonius KappaCCD APEXII'
_diffrn_measurement_method       'omega and phi scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0450
_diffrn_reflns_av_unetI/netI     0.0372
_diffrn_reflns_limit_h_max       20
_diffrn_reflns_limit_h_min       -19
_diffrn_reflns_limit_k_max       24
_diffrn_reflns_limit_k_min       -23
_diffrn_reflns_limit_l_max       4
_diffrn_reflns_limit_l_min       -4
_diffrn_reflns_number            6206
_diffrn_reflns_theta_full        67.19
_diffrn_reflns_theta_max         67.19
_diffrn_reflns_theta_min         3.38
_diffrn_source                   CuK\a
_diffrn_source_type              'fine-focus sealed tube'
_exptl_absorpt_coefficient_mu    0.724
_exptl_absorpt_correction_T_max  0.97
_exptl_absorpt_correction_T_min  0.85
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
Denzo (Otwinowski, Borek, Majewski & Minor, 2003)
;
_exptl_crystal_colour            red
_exptl_crystal_density_diffrn    1.355
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             572
_exptl_crystal_size_max          0.230
_exptl_crystal_size_mid          0.040
_exptl_crystal_size_min          0.040
_refine_diff_density_max         0.132
_refine_diff_density_min         -0.173
_refine_ls_abs_structure_details
;
Flack x determined using 710 quotients [(I+)-(I-)]/[(I+)+(I-)]
(Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.3(4)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.050
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     190
_refine_ls_number_reflns         2243
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.050
_refine_ls_R_factor_all          0.0472
_refine_ls_R_factor_gt           0.0401
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0434P)^2^+0.3597P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0925
_refine_ls_wR_factor_ref         0.0974
_reflns_number_gt                1979
_reflns_number_total             2243
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c8cp03332c2.cif
_cod_data_source_block           stu7135
_cod_depositor_comments
'Adding full bibliography for 7231447--7231450.cif.'
_cod_database_code               7231448
_shelx_res_checksum              63734