Pinning down the solid-state polymorphism of the ionic liquid [bmim][PF6]
Saouane, Sofiane; Norman, Sarah E.; Hardacre, Christopher; Fabbiani, Francesca P. A.; Chemical Science 4 (2013) 1270–; doi:10.1039/c2sc21959j

data_1514603
_publ_section_title
;
 Pinning down the solid-state polymorphism of the ionic liquid [bmim][PF6]
;
_journal_issue                   3
_journal_name_full               'Chemical Science'
_journal_page_first              1270
_journal_paper_doi               10.1039/c2sc21959j
_journal_volume                  4
_journal_year                    2013
_chemical_formula_moiety         'C8 H15 N2, P F6'
_chemical_formula_sum            'C8 H15 F6 N2 P'
_chemical_formula_weight         284.19
_space_group_IT_number           61
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2ab'
_symmetry_space_group_name_H-M   'P b c a'
_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            8
_cell_length_a                   9.4924(5)
_cell_length_b                   9.8406(5)
_cell_length_c                   26.8817(13)
_cell_measurement_reflns_used    9895
_cell_measurement_temperature    193(2)
_cell_measurement_theta_max      72.2375
_cell_measurement_theta_min      3.288
_cell_volume                     2511.0(2)
_computing_cell_refinement       'Apex2 (Bruker AXS, 2006)'
_computing_data_collection       'Apex2 (Bruker AXS, 2006)'
_computing_data_reduction        'Apex2 (Bruker AXS, 2006)'
_computing_molecular_graphics    MERCURY
_computing_publication_material  'PLATON, XCIF, ENCIFER, SHELXLE'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      193(2)
_diffrn_measured_fraction_theta_full 0.971
_diffrn_measured_fraction_theta_max 0.971
_diffrn_measurement_device_type  'Bruker SMART 6000'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  'INCOATEC multilayer optics'
_diffrn_radiation_source         'rotating anode'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0652
_diffrn_reflns_av_sigmaI/netI    0.0311
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       33
_diffrn_reflns_limit_l_min       -32
_diffrn_reflns_number            28075
_diffrn_reflns_theta_full        72.78
_diffrn_reflns_theta_max         72.78
_diffrn_reflns_theta_min         3.29
_exptl_absorpt_coefficient_mu    2.531
_exptl_absorpt_correction_T_max  0.7536
_exptl_absorpt_correction_T_min  0.2599
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'based on symmetry-related measuraments'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.503
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1168
_exptl_crystal_size_max          0.8
_exptl_crystal_size_mid          0.6
_exptl_crystal_size_min          0.1
_refine_diff_density_max         0.271
_refine_diff_density_min         -0.391
_refine_diff_density_rms         0.052
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.124
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     229
_refine_ls_number_reflns         2427
_refine_ls_number_restraints     255
_refine_ls_restrained_S_all      1.150
_refine_ls_R_factor_all          0.0555
_refine_ls_R_factor_gt           0.0482
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0890P)^2^+0.5459P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1463
_refine_ls_wR_factor_ref         0.1551
_reflns_number_gt                2054
_reflns_number_total             2427
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c2sc21959j.txt
_cod_data_source_block           alpha_bmim_PF6_193K
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' according to
/usr/data/users/saulius/automatic-downloads/retrospective/RSC/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 2281 2013-09-26 08:29:07Z andrius 
;
_cod_original_sg_symbol_Hall     '-P 2ac 2ab '
_cod_original_sg_symbol_H-M      'P b c a '
_cod_database_code               1514603