Ionic liquids via reaction of the zwitterionic 1,3-dimethylimidazolium-2-carboxylate with protic acids. Overcoming synthetic limitations and establishing new halide free protocols for the formation of ILs
Smiglak, Marcin; Holbrey, John D.; Griffin, Scott T.; Reichert, W. Matthew; Swatloski, Richard P.; Katritzky, Alan R.; Yang, Hongfang; Zhang, Dazhi; Kirichenko, Kostyantyn; Rogers, Robin D.; Green Chemistry 9 (2007) 90–; doi:10.1039/b610421e

data_7202475
_publ_section_title
;
 Ionic liquids via reaction of the zwitterionic
 1,3-dimethylimidazolium-2-carboxylate with protic acids. Overcoming
 synthetic limitations and establishing new halide free protocols for
 the formation of ILs
;
_journal_issue                   1
_journal_name_full               'Green Chemistry'
_journal_page_first              90
_journal_paper_doi               10.1039/b610421e
_journal_volume                  9
_journal_year                    2007
_chemical_formula_sum            'C6 H9 N3 O5'
_chemical_formula_weight         203.16
_chemical_name_common            '4-carboxy-1,3-dimethylimidazolium nitrate'
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 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                 104.508(7)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   6.628(2)
_cell_length_b                   11.910(4)
_cell_length_c                   11.538(4)
_cell_measurement_reflns_used    537
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      23.24
_cell_measurement_theta_min      2.50
_cell_volume                     881.8(5)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_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      173(2)
_diffrn_measured_fraction_theta_full 0.992
_diffrn_measured_fraction_theta_max 0.992
_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  0.0315
_diffrn_reflns_av_sigmaI/netI    0.0407
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -10
_diffrn_reflns_number            3851
_diffrn_reflns_theta_full        23.27
_diffrn_reflns_theta_max         23.27
_diffrn_reflns_theta_min         2.50
_exptl_absorpt_coefficient_mu    0.134
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.531
_exptl_crystal_density_meas      0
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       flat
_exptl_crystal_F_000             424
_exptl_crystal_size_max          0.26
_exptl_crystal_size_mid          0.12
_exptl_crystal_size_min          0.04
_refine_diff_density_max         0.227
_refine_diff_density_min         -0.163
_refine_diff_density_rms         0.054
_refine_ls_extinction_coef       0.0053(18)
_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   1.074
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     164
_refine_ls_number_reflns         1264
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.074
_refine_ls_R_factor_all          0.0625
_refine_ls_R_factor_gt           0.0448
_refine_ls_shift/su_max          0.018
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0515P)^2^+0.4373P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1004
_refine_ls_wR_factor_ref         0.1067
_reflns_number_gt                1000
_reflns_number_total             1264
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b610421e.txt
_cod_data_source_block           5a
_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_enum 1527 2010-12-29 10:47:43Z saulius 
;
_cod_original_cell_volume        881.7(5)
_cod_original_sg_symbol_H-M      P2(1)/n
_cod_database_code               7202475