Structural Studies of Crystalline 1-Alkyl-3-Methylimidazolium Chloride Salts
Downard, A.; Earle, M. J.; Hardacre, C.; McMath, S. E. J.; Nieuwenhuyzen, M.; Teat, S. J.; Chemistry of Materials 16 (2004) 43–; doi:10.1021/cm034344a

data_4001610
_publ_section_title
;
 Structural Studies of Crystalline 1-Alkyl-3-Methylimidazolium Chloride
 Salts
;
_journal_issue                   1
_journal_name_full               'Chemistry of Materials'
_journal_page_first              43
_journal_paper_doi               10.1021/cm034344a
_journal_volume                  16
_journal_year                    2004
_chemical_formula_sum            'C24 H48 Cl4 N2 O'
_chemical_formula_weight         522.44
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                92.057(8)
_cell_angle_beta                 94.654(8)
_cell_angle_gamma                108.591(7)
_cell_formula_units_Z            2
_cell_length_a                   6.810(3)
_cell_length_b                   9.037(4)
_cell_length_c                   25.214(11)
_cell_measurement_temperature    298(2)
_cell_volume                     1462.8(11)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SHELXTL'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  '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  0.0856
_diffrn_reflns_av_sigmaI/netI    0.1564
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       29
_diffrn_reflns_limit_l_min       -29
_diffrn_reflns_number            10896
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         0.81
_exptl_absorpt_coefficient_mu    0.422
_exptl_absorpt_correction_T_max  0.9128
_exptl_absorpt_correction_T_min  0.8492
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.186
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       'irregular plate'
_exptl_crystal_F_000             564
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.33
_exptl_crystal_size_min          0.22
_refine_diff_density_max         0.685
_refine_diff_density_min         -0.511
_refine_diff_density_rms         0.105
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.930
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     320
_refine_ls_number_reflns         5128
_refine_ls_number_restraints     6
_refine_ls_restrained_S_all      0.931
_refine_ls_R_factor_all          0.2118
_refine_ls_R_factor_gt           0.1046
_refine_ls_shift/su_max          0.009
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1774P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2595
_refine_ls_wR_factor_ref         0.3228
_reflns_number_gt                2064
_reflns_number_total             5128
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            cm034344asi20030512_040331.cif
_cod_data_source_block           abd005m
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Triclinic' changed to 'triclinic'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 

The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'not_measured' was changed to '?'
- the value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 
;
_cod_original_sg_symbol_H-M      P-1
_cod_database_code               4001610