Unveiling n → π* interactions: convergence of quantum crystallography and computational insights.
Polo, Alvaro; García-Orduña, Pilar; Echeverría, Jorge; Sanz Miguel, Pablo J.; Dalton transactions (Cambridge, England : 2003) 55 (2026) 2825–2832; doi:10.1039/d5dt02386f

data_7720183
_publ_section_title
;
 Unveiling n &#x2192; &#x3c0;* interactions: convergence of quantum
 crystallography and computational insights.
;
_journal_issue                   7
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              2825
_journal_page_last               2832
_journal_paper_doi               10.1039/d5dt02386f
_journal_volume                  55
_journal_year                    2026
_chemical_formula_moiety         'C8 H11 N4 O, I'
_chemical_formula_sum            'C8 H11 I N4 O'
_chemical_formula_weight         306.11
_space_group_crystal_system      orthorhombic
_space_group_IT_number           29
_space_group_name_Hall           'P 2c -2ac'
_space_group_name_H-M_alt        'P c a 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   'Fourier Difference Synthesis'
_audit_creation_method           SHELXL-2014/7
_audit_update_record
;
2025-11-14 deposited with the CCDC.	2025-12-19 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   11.3493(7)
_cell_length_b                   11.5417(7)
_cell_length_c                   8.4397(5)
_cell_measurement_reflns_used    9753
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      28.31
_cell_measurement_theta_min      2.99
_cell_volume                     1105.52(12)
_computing_cell_refinement       'SAINT V8.40B (Bruker AXS, 2016) in APEX3'
_computing_data_collection       'SAINT V8.40B (Bruker AXS, 2016) in APEX3'
_computing_data_reduction        'SAINT V8.40B (Bruker AXS, 2016) in APEX3'
_computing_molecular_graphics    'ORTEP-3 (Farrugia, 2012)'
_computing_publication_material  'XCIF program, PLATON(Spek, 1998)'
_computing_structure_refinement  'SHELXL-2018/3 (Sheldrick, 2018)'
_computing_structure_solution    'SHELXS-2013 (Sheldrick, 2013)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker D8 VENTURE'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0294
_diffrn_reflns_av_unetI/netI     0.0191
_diffrn_reflns_Laue_measured_fraction_full 0.998
_diffrn_reflns_Laue_measured_fraction_max 0.999
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       11
_diffrn_reflns_limit_l_min       -11
_diffrn_reflns_number            52792
_diffrn_reflns_point_group_measured_fraction_full 0.995
_diffrn_reflns_point_group_measured_fraction_max 0.996
_diffrn_reflns_theta_full        25.000
_diffrn_reflns_theta_max         28.318
_diffrn_reflns_theta_min         2.517
_diffrn_source                   'Mo microsource'
_exptl_absorpt_coefficient_mu    2.873
_exptl_absorpt_correction_T_max  0.795
_exptl_absorpt_correction_T_min  0.663
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.839
_exptl_crystal_description       blocks
_exptl_crystal_F_000             592
_exptl_crystal_size_max          0.250
_exptl_crystal_size_mid          0.120
_exptl_crystal_size_min          0.080
_refine_diff_density_max         0.303
_refine_diff_density_min         -0.444
_refine_diff_density_rms         0.050
_refine_ls_abs_structure_details
;
 Flack x determined using 1263 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.018(4)
_refine_ls_extinction_coef       0.0026(3)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL-2014/7 (Sheldrick 2014'
_refine_ls_goodness_of_fit_ref   1.069
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     131
_refine_ls_number_reflns         2745
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.068
_refine_ls_R_factor_all          0.0110
_refine_ls_R_factor_gt           0.0110
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0071P)^2^+0.3566P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0271
_refine_ls_wR_factor_ref         0.0271
_reflns_Friedel_coverage         0.866
_reflns_Friedel_fraction_full    0.992
_reflns_Friedel_fraction_max     0.994
_reflns_number_gt                2742
_reflns_number_total             2745
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d5dt02386f2.cif
_cod_data_source_block           1_CCDC5
_cod_depositor_comments
;
The following automatic conversions were performed:

data item '_atom_sites_solution_primary' value 'Direct methods' was
changed to 'direct'.

Automatic conversion script
Id: cif_fix_values 8170 2020-07-09 18:12:32Z antanas 
;
_cod_database_code               7720183
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.534
_shelx_estimated_absorpt_t_max   0.803
_shelx_res_checksum              22890