# Supplementary Information (SI) for ChemComm.
# This journal is © The Royal Society of Chemistry 2026

####################################################################### 
# 
# This file contains crystal structure data downloaded from the 
# Cambridge Structural Database (CSD) hosted by the Cambridge 
# Crystallographic Data Centre (CCDC).
# 
# Full information about CCDC data access policies and citation 
# guidelines are available at http://www.ccdc.cam.ac.uk/access/V1 
# 
# Audit and citation data items may have been added by the CCDC. 
# Please retain this information to preserve the provenance of 
# this file and to allow appropriate attribution of the data. 
# 
#######################################################################

data_1
_database_code_depnum_ccdc_archive 'CCDC 2522617'
loop_
_audit_author_name
_audit_author_address
Yichen-Liu
;Fujian Institute of Research on the Structure 
China
;
_audit_update_record             
;
2026-01-14 deposited with the CCDC.	2026-03-13 downloaded from the CCDC.
;
_audit_creation_date             2026-01-14
_audit_creation_method           
;
Olex2 1.5
(compiled 2025.07.13 svn.rb7424aed for OlexSys, GUI svn.r7314)
;
_shelx_SHELXL_version_number     2018/3
_chemical_name_common            ?
_chemical_name_systematic        ?
_chemical_formula_moiety         'Cl4 I, C5 H7 N2'
_chemical_formula_sum            'C5 H7 Cl4 I N2'
_chemical_formula_weight         363.83
_chemical_melting_point          ?
loop_
_atom_type_symbol
_atom_type_description
_atom_type_scat_dispersion_real
_atom_type_scat_dispersion_imag
_atom_type_scat_source
C C 0.0033 0.0016 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
H H 0.0000 0.0000 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
Cl Cl 0.1484 0.1585 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
I I -0.4742 1.8119 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
N N 0.0061 0.0033 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'

_shelx_space_group_comment       
;
The symmetry employed for this shelxl refinement is uniquely defined
by the following loop, which should always be used as a source of
symmetry information in preference to the above space-group names.
They are only intended as comments.
;
_space_group_crystal_system      monoclinic
_space_group_IT_number           11
_space_group_name_H-M_alt        'P 1 21/m 1'
_space_group_name_Hall           '-P 2yb'
loop_
_space_group_symop_operation_xyz
'x, y, z'
'-x, y+1/2, -z'
'-x, -y, -z'
'x, -y-1/2, z'

_cell_length_a                   4.0937(5)
_cell_length_b                   11.9204(15)
_cell_length_c                   11.0250(16)
_cell_angle_alpha                90
_cell_angle_beta                 93.656(11)
_cell_angle_gamma                90
_cell_volume                     536.91(12)
_cell_formula_units_Z            2
_cell_measurement_reflns_used    1950
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      28.4150
_cell_measurement_theta_min      3.6620
_shelx_estimated_absorpt_T_max   0.996
_shelx_estimated_absorpt_T_min   0.962
_exptl_absorpt_coefficient_mu    3.927
_exptl_absorpt_correction_T_max  ?
_exptl_absorpt_correction_T_min  ?
_exptl_absorpt_correction_type   none
_exptl_absorpt_process_details   ?
_exptl_absorpt_special_details   ?
_exptl_crystal_colour            'clear yellowish yellow'
_exptl_crystal_colour_lustre     clear
_exptl_crystal_colour_modifier   yellowish
_exptl_crystal_colour_primary    yellow
_exptl_crystal_density_diffrn    2.250
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    ?
_exptl_crystal_description       needle
_exptl_crystal_F_000             344
_exptl_crystal_preparation       ?
_exptl_crystal_recrystallization_method ?
_exptl_crystal_size_max          0.01
_exptl_crystal_size_mid          0.001
_exptl_crystal_size_min          0.001
_exptl_transmission_factor_max   ?
_exptl_transmission_factor_min   ?
_diffrn_reflns_av_R_equivalents  0.0460
_diffrn_reflns_av_unetI/netI     0.0536
_diffrn_reflns_Laue_measured_fraction_full 0.997
_diffrn_reflns_Laue_measured_fraction_max 0.873
_diffrn_reflns_limit_h_max       5
_diffrn_reflns_limit_h_min       -5
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            3762
_diffrn_reflns_point_group_measured_fraction_full 0.997
_diffrn_reflns_point_group_measured_fraction_max 0.873
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         29.071
_diffrn_reflns_theta_min         2.519
_diffrn_ambient_temperature      293(2)
_diffrn_detector_area_resol_mean ?
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.873
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       'φ and ω scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_source                   ?
_diffrn_standards_number         0
_reflns_Friedel_coverage         0.000
_reflns_Friedel_fraction_full    .
_reflns_Friedel_fraction_max     .
_reflns_number_gt                1096
_reflns_number_total             1317
_reflns_special_details          
;
 Reflections were merged by SHELXL according to the crystal
 class for the calculation of statistics and refinement.
 
 _reflns_Friedel_fraction is defined as the number of unique
 Friedel pairs measured divided by the number that would be
 possible theoretically, ignoring centric projections and
 systematic absences.
;
_reflns_threshold_expression     'I > 2σ(I)'
_computing_cell_refinement       ?
_computing_data_collection       ?
_computing_data_reduction        ?
_computing_molecular_graphics    'Olex2 1.5 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 1.5 (Dolomanov et al., 2009)'
_computing_structure_refinement  'SHELXL 2018/3 (Sheldrick, 2015)'
_computing_structure_solution    'olex2.solve 1.5 (Bourhis et al., 2015)'
_refine_diff_density_max         1.137
_refine_diff_density_min         -0.944
_refine_diff_density_rms         0.189
_refine_ls_extinction_coef       .
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.075
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     61
_refine_ls_number_reflns         1317
_refine_ls_number_restraints     0
_refine_ls_R_factor_all          0.0482
_refine_ls_R_factor_gt           0.0364
_refine_ls_restrained_S_all      1.075
_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/[σ²(Fo²)+(0.0393P)²] where P=(Fo²+2Fc²)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0813
_refine_ls_wR_factor_ref         0.0886
_refine_special_details          ?
_olex2_refinement_description    
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All N(H) groups
2.a Riding coordinates:
 N1(H1), N2(H2)
2.b Aromatic/amide H refined with riding coordinates:
 C1(H1A), C2(H2A)
;
_atom_sites_solution_hydrogens   mixed
_atom_sites_solution_primary     iterative
_atom_sites_solution_secondary   ?
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
_atom_site_adp_type
_atom_site_occupancy
_atom_site_site_symmetry_order
_atom_site_calc_flag
_atom_site_refinement_flags_posn
_atom_site_refinement_flags_adp
_atom_site_refinement_flags_occupancy
_atom_site_disorder_assembly
_atom_site_disorder_group
I1 I 0.31317(10) 0.250000 0.75061(4) 0.01736(16) Uani 1 2 d S T P . .
Cl1 Cl 0.5198(3) 0.10501(9) 0.90012(11) 0.0274(3) Uani 1 1 d . . . . .
Cl2 Cl 0.1141(3) 0.09737(10) 0.60787(11) 0.0281(3) Uani 1 1 d . . . . .
N1 N -0.0269(14) 0.250000 0.1171(6) 0.0317(14) Uani 1 2 d S T P . .
H1 H -0.161394 0.250000 0.053934 0.038 Uiso 1 2 d R U P . .
N2 N 0.6078(15) 0.250000 0.4145(6) 0.0394(16) Uani 1 2 d S T P . .
H2 H 0.680376 0.314510 0.445594 0.047 Uiso 1 1 d R U . . .
C1 C 0.0724(13) 0.1506(4) 0.1661(5) 0.0324(12) Uani 1 1 d . . . . .
H1A H -0.004941 0.083863 0.131268 0.039 Uiso 1 1 calc R U . . .
C2 C 0.2857(12) 0.1478(4) 0.2666(5) 0.0307(12) Uani 1 1 d . . . . .
H2A H 0.355174 0.079474 0.299658 0.037 Uiso 1 1 calc R U . . .
C3 C 0.4010(17) 0.250000 0.3203(7) 0.0294(16) Uani 1 2 d S T P . .


_geom_special_details            
;
 All esds (except the esd in the dihedral angle between two l.s. planes)
 are estimated using the full covariance matrix.  The cell esds are taken
 into account individually in the estimation of esds in distances, angles
 and torsion angles; correlations between esds in cell parameters are only
 used when they are defined by crystal symmetry.  An approximate (isotropic)
 treatment of cell esds is used for estimating esds involving l.s. planes.
;
loop_
_geom_bond_atom_site_label_1
_geom_bond_atom_site_label_2
_geom_bond_distance
_geom_bond_site_symmetry_2
_geom_bond_publ_flag
I1 Cl1 2.4984(12) . ?
I1 Cl1 2.4985(12) 4_565 ?
I1 Cl2 2.5074(12) . ?
I1 Cl2 2.5074(12) 4_565 ?
N1 H1 0.8600 . ?
N1 C1 1.354(6) 4_565 ?
N1 C1 1.354(6) . ?
N2 H2 0.8855 . ?
N2 H2 0.8854 4_565 ?
N2 C3 1.297(9) . ?
C1 H1A 0.9300 . ?
C1 C2 1.366(7) . ?
C2 H2A 0.9300 . ?
C2 C3 1.421(6) . ?

loop_
_geom_angle_atom_site_label_1
_geom_angle_atom_site_label_2
_geom_angle_atom_site_label_3
_geom_angle
_geom_angle_site_symmetry_1
_geom_angle_site_symmetry_3
_geom_angle_publ_flag
Cl1 I1 Cl1 87.54(6) . 4_565 ?
Cl1 I1 Cl2 89.71(4) 4_565 4_565 ?
Cl1 I1 Cl2 177.25(4) . 4_565 ?
Cl1 I1 Cl2 177.25(4) 4_565 . ?
Cl1 I1 Cl2 89.71(4) . . ?
Cl2 I1 Cl2 93.04(6) 4_565 . ?
C1 N1 H1 118.9 . . ?
C1 N1 H1 118.9 4_565 . ?
C1 N1 C1 122.1(7) . 4_565 ?
H2 N2 H2 120.6 . 4_565 ?
C3 N2 H2 119.703(12) . 4_565 ?
C3 N2 H2 119.7 . . ?
N1 C1 H1A 119.9 . . ?
N1 C1 C2 120.3(5) . . ?
C2 C1 H1A 119.9 . . ?
C1 C2 H2A 120.2 . . ?
C1 C2 C3 119.7(5) . . ?
C3 C2 H2A 120.2 . . ?
N2 C3 C2 121.1(3) . 4_565 ?
N2 C3 C2 121.1(3) . . ?
C2 C3 C2 117.9(7) 4_565 . ?

loop_
_geom_torsion_atom_site_label_1
_geom_torsion_atom_site_label_2
_geom_torsion_atom_site_label_3
_geom_torsion_atom_site_label_4
_geom_torsion
_geom_torsion_site_symmetry_1
_geom_torsion_site_symmetry_2
_geom_torsion_site_symmetry_3
_geom_torsion_site_symmetry_4
_geom_torsion_publ_flag
N1 C1 C2 C3 0.6(8) . . . . ?
C1 N1 C1 C2 -1.6(10) 4_565 . . . ?
C1 C2 C3 N2 -178.8(6) . . . . ?
C1 C2 C3 C2 0.3(9) . . . 4_565 ?

_olex2_submission_special_instructions 'No special instructions were received'
