Diiodoacetylene: compact, strong ditopic halogen bond donor
Perkins, Catherine; Libri, Stefano; Adams, Harry; Brammer, Lee; CrystEngComm 14 (2012) 3033–; doi:10.1039/c2ce00029f

data_7207731
_publ_section_title
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 Diiodoacetylene: compact, strong ditopic halogen bond donor
;
_journal_issue                   9
_journal_name_full               CrystEngComm
_journal_page_first              3033
_journal_paper_doi               10.1039/c2ce00029f
_journal_volume                  14
_journal_year                    2012
_chemical_formula_moiety         'C2 I4, C6 H12 N4'
_chemical_formula_sum            'C8 H12 I4 N4'
_chemical_formula_weight         671.82
_chemical_name_systematic
;
?
;
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 92.800(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   15.9274(7)
_cell_length_b                   11.0145(4)
_cell_length_c                   8.7574(4)
_cell_measurement_temperature    120(2)
_cell_volume                     1534.50(11)
_computing_cell_refinement       'Bruker APEX II'
_computing_data_collection       'Bruker APEX II'
_computing_data_reduction        'Bruker APEX II'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      120(2)
_diffrn_measured_fraction_theta_full 0.949
_diffrn_measured_fraction_theta_max 0.949
_diffrn_measurement_device_type  'Bruker APEX-II CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0356
_diffrn_reflns_av_sigmaI/netI    0.0284
_diffrn_reflns_limit_h_max       20
_diffrn_reflns_limit_h_min       -20
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -10
_diffrn_reflns_number            15754
_diffrn_reflns_theta_full        27.52
_diffrn_reflns_theta_max         27.52
_diffrn_reflns_theta_min         2.25
_exptl_absorpt_coefficient_mu    8.106
_exptl_absorpt_correction_T_max  0.3081
_exptl_absorpt_correction_T_min  0.1282
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    2.908
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1200
_exptl_crystal_size_max          0.43
_exptl_crystal_size_mid          0.28
_exptl_crystal_size_min          0.19
_refine_diff_density_max         2.610
_refine_diff_density_min         -2.270
_refine_diff_density_rms         0.245
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.191
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     176
_refine_ls_number_reflns         3358
_refine_ls_number_restraints     51
_refine_ls_restrained_S_all      1.208
_refine_ls_R_factor_all          0.0632
_refine_ls_R_factor_gt           0.0491
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0122P)^2^+27.9266P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0900
_refine_ls_wR_factor_ref         0.0952
_reflns_number_gt                2595
_reflns_number_total             3358
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c2ce00029f.txt
_cod_data_source_block           hmta
_cod_database_code               7207731