Solid-State Analysis of Low-Melting 1,3-Dialkylimidazolium Hexafluorophosphate Salts (Ionic Liquids) by Combined X-ray Crystallographic and Computational Analyses
Reichert, W. Matthew; Holbrey, John D.; Swatloski, Richard P.; Gutowski, Keith E.; Visser, Ann E.; Nieuwenhuyzen, Mark; Seddon, Kenneth R.; Rogers, Robin D.; Crystal Growth & Design 7 (2007) 1106–; doi:10.1021/cg060746u

data_4504067
_publ_section_title
;
 Solid-State Analysis of Low-Melting 1,3-Dialkylimidazolium
 Hexafluorophosphate Salts (Ionic Liquids) by Combined X-ray
 Crystallographic and Computational Analyses
;
_journal_issue                   6
_journal_name_full               'Crystal Growth &amp; Design'
_journal_page_first              1106
_journal_paper_doi               10.1021/cg060746u
_journal_volume                  7
_journal_year                    2007
_chemical_formula_sum            'C8 H15 F6 N2 P'
_chemical_formula_weight         284.19
_chemical_name_common
'1-sec-butyl-3-methylimidazolium hexafluorophosphate'
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           11
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yb'
_symmetry_space_group_name_H-M   'P 1 21/m 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                 116.416(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   8.9541(9)
_cell_length_b                   8.0375(8)
_cell_length_c                   9.6548(9)
_cell_measurement_reflns_used    766
_cell_measurement_temperature    153(2)
_cell_measurement_theta_max      21.61
_cell_measurement_theta_min      2.469
_cell_volume                     622.29(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      153(2)
_diffrn_measured_fraction_theta_full 0.927
_diffrn_measured_fraction_theta_max 0.927
_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  0.0513
_diffrn_reflns_av_sigmaI/netI    0.0281
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            7232
_diffrn_reflns_theta_full        28.58
_diffrn_reflns_theta_max         28.58
_diffrn_reflns_theta_min         2.36
_exptl_absorpt_coefficient_mu    0.276
_exptl_absorpt_correction_T_max  1.000000
_exptl_absorpt_correction_T_min  0.698544
_exptl_absorpt_correction_type   sphere
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.517
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Block
_exptl_crystal_F_000             292
_refine_diff_density_max         0.631
_refine_diff_density_min         -0.674
_refine_diff_density_rms         0.079
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.108
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     148
_refine_ls_number_reflns         1569
_refine_ls_number_restraints     39
_refine_ls_restrained_S_all      1.253
_refine_ls_R_factor_all          0.0833
_refine_ls_R_factor_gt           0.0738
_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^)+(0.1303P)^2^+0.3671P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2147
_refine_ls_wR_factor_ref         0.2261
_reflns_number_gt                1285
_reflns_number_total             1569
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            cg060746usi20061024_064425.cif
_cod_data_source_block           6
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
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 
;
_cod_original_sg_symbol_H-M      P2(1)/m
_cod_database_code               4504067