Conformational Flexibility and Cation–Anion Interactions in 1-Butyl-2,3-dimethylimidazolium Salts
Laus, Gerhard; Bentivoglio, Gino; Kahlenberg, Volker; Wurst, Klaus; Nauer, Gerhard; Schottenberger, Herwig; Tanaka, Masato; Siehl, Hans-Ullrich; Crystal Growth & Design 12 (2012) 1838–; doi:10.1021/cg201424m

data_4505892
_publ_section_title
;
 Conformational Flexibility and Cation--Anion Interactions in
 1-Butyl-2,3-dimethylimidazolium Salts
;
_journal_issue                   4
_journal_name_full               'Crystal Growth &amp; Design'
_journal_page_first              1838
_journal_paper_doi               10.1021/cg201424m
_journal_volume                  12
_journal_year                    2012
_chemical_formula_moiety         'C9 H17 N2, C3 H O2'
_chemical_formula_sum            'C12 H18 N2 O2'
_chemical_formula_weight         222.28
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_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                90.000
_cell_angle_beta                 110.168(16)
_cell_angle_gamma                90.000
_cell_formula_units_Z            4
_cell_length_a                   7.1066(15)
_cell_length_b                   20.285(3)
_cell_length_c                   9.274(2)
_cell_measurement_reflns_used    5796
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      27.4
_cell_measurement_theta_min      1.0
_cell_volume                     1254.9(4)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.964
_diffrn_measurement_device_type  'Stoe IPDS-II'
_diffrn_measurement_method       omega-scans
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71069
_diffrn_reflns_av_R_equivalents  0.0640
_diffrn_reflns_av_sigmaI/netI    0.0613
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       23
_diffrn_reflns_limit_k_min       -25
_diffrn_reflns_limit_l_max       11
_diffrn_reflns_limit_l_min       -11
_diffrn_reflns_number            9160
_diffrn_reflns_theta_full        27.10
_diffrn_reflns_theta_max         26.80
_diffrn_reflns_theta_min         2.01
_exptl_absorpt_coefficient_mu    0.081
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.177
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             480
_exptl_crystal_size_max          0.4
_exptl_crystal_size_mid          0.3
_exptl_crystal_size_min          0.02
_refine_diff_density_max         0.181
_refine_diff_density_min         -0.204
_refine_diff_density_rms         0.042
_refine_ls_extinction_coef       0.034(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   1.029
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     153
_refine_ls_number_reflns         2659
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.029
_refine_ls_R_factor_all          0.1160
_refine_ls_R_factor_gt           0.0569
_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^)+(0.0411P)^2^+0.4408P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1075
_refine_ls_wR_factor_ref         0.1310
_reflns_number_gt                1528
_reflns_number_total             2659
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            cg201424m_si_003.cif
_cod_data_source_block           BMMI_propynoate
_cod_original_sg_symbol_Hall     -P2ybc
_cod_original_sg_symbol_H-M      P2(1)/c
_cod_database_code               4505892