Competing patterns of weak directional forces in pressure-frozen CH2ClI and CH2I2.
Podsiadło, Marcin; Katrusiak, Andrzej; The journal of physical chemistry. B 112 (2008) 5355–5362; doi:10.1021/jp8006574

data_1504382
_publ_section_title
;
 Competing patterns of weak directional forces in pressure-frozen CH2ClI
 and CH2I2.
;
_journal_issue                   17
_journal_name_full               'The journal of physical chemistry. B'
_journal_page_first              5355
_journal_page_last               5362
_journal_paper_doi               10.1021/jp8006574
_journal_volume                  112
_journal_year                    2008
_chemical_formula_moiety         'C1 H2 I2'
_chemical_formula_sum            'C H2 I2'
_chemical_formula_weight         267.83
_chemical_melting_point          279
_chemical_name_common            diiodomethane
_chemical_name_systematic
; 
diiodomethane, polymorph II
;
_space_group_IT_number           42
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'F 2 -2'
_symmetry_space_group_name_H-M   'F m m 2'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   6.9208(14)
_cell_length_b                   12.695(3)
_cell_length_c                   4.5338(9)
_cell_measurement_reflns_used    631
_cell_measurement_temperature    295(2)
_cell_measurement_theta_max      28.99
_cell_measurement_theta_min      5.61
_cell_volume                     398.34(15)
_computing_cell_refinement       'CrysAlisRED (Oxford Diffraction, 2004)'
_computing_data_collection       'CrysAlisCCD (Oxford Diffraction, 2004)'
_computing_data_reduction
'CrysAlisRED (Oxford Diffraction, 2004); REDSHABS (Katrusiak, A.  2003)'
_computing_molecular_graphics    'SHELXTL (Sheldrick, 1990)'
_computing_publication_material  'SHELXL--97 (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL--97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS--97 (Sheldrick, 1997)'
_diffrn_ambient_environment      'diamond-anvil cell'
_diffrn_ambient_pressure         1560000
_diffrn_ambient_temperature      295(2)
_diffrn_measured_fraction_theta_full 0.308
_diffrn_measured_fraction_theta_max 0.308
_diffrn_measurement_device_type  'KM-4 CCD'
_diffrn_measurement_method       '\f- and \w-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  0.0923
_diffrn_reflns_av_sigmaI/netI    0.0397
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       4
_diffrn_reflns_limit_k_min       -4
_diffrn_reflns_limit_l_max       6
_diffrn_reflns_limit_l_min       -6
_diffrn_reflns_number            853
_diffrn_reflns_theta_full        28.99
_diffrn_reflns_theta_max         28.99
_diffrn_reflns_theta_min         5.61
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    15.537
_exptl_absorpt_correction_T_max  0.52
_exptl_absorpt_correction_T_min  0.27
_exptl_absorpt_correction_type   numerical
_exptl_absorpt_process_details
; 
 Correction for absorption of the diamond-anvil cell and the sample 
 were made using program REDSHABS (Katrusiak, A. (2003) REDSHABS. Adam
 Mickiewicz University Pozna\'n; Katrusiak, A. (2004) Z. Kristallogr.
 219, 461-467).
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    4.466
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       cylinder
_exptl_crystal_F_000             456
_exptl_crystal_size_max          0.41
_exptl_crystal_size_mid          0.41
_exptl_crystal_size_min          0.07
_refine_diff_density_max         0.375
_refine_diff_density_min         -0.212
_refine_diff_density_rms         0.075
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.5(4)
_refine_ls_extinction_coef       0.0020(3)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.174
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     12
_refine_ls_number_reflns         94
_refine_ls_number_restraints     3
_refine_ls_restrained_S_all      1.153
_refine_ls_R_factor_all          0.0187
_refine_ls_R_factor_gt           0.0171
_refine_ls_shift/su_max          0.003
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0089P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0211
_refine_ls_wR_factor_ref         0.0212
_reflns_number_gt                92
_reflns_number_total             94
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jp8006574-file003.cif
_cod_data_source_block           djm_1.56GPa
_cod_original_cell_volume        398.34(14)
_cod_database_code               1504382