Observation of helical water chains reversibly inlayed in magnesium imidazole-4,5-dicarboxylate
Zhong, Rui-Qin; Zou, Ru-Qiang; Du, Miao; Takeichi, Nobuhiko; Xu, Qiang; CrystEngComm 10 (2008) 1175–; doi:10.1039/b806210m

data_7202183
_publ_section_title
;
 Observation of helical water chains reversibly inlayed in magnesium
 imidazole-4,5-dicarboxylate
;
_journal_issue                   9
_journal_name_full               CrystEngComm
_journal_page_first              1175
_journal_paper_doi               10.1039/b806210m
_journal_volume                  10
_journal_year                    2008
_chemical_formula_sum            'C5 H9 Mg N2 O7.5'
_chemical_formula_weight         241.45
_chemical_name_systematic
;
?
;
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/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                90.00
_cell_angle_beta                 108.27(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   13.936(3)
_cell_length_b                   11.642(2)
_cell_length_c                   12.090(2)
_cell_measurement_reflns_used    1423
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      27.40
_cell_measurement_theta_min      2.54
_cell_volume                     1862.6(7)
_computing_cell_refinement       'Rigaku RAXIS-RAPID'
_computing_data_collection       'Rigaku RAXIS-RAPID'
_computing_data_reduction        'Rigaku RAXIS-RAPID'
_computing_molecular_graphics    SHELXTL
_computing_publication_material  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 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Rigaku RAXIS-RAPID'
_diffrn_measurement_method       \w
_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  0.0153
_diffrn_reflns_av_sigmaI/netI    0.0118
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            7224
_diffrn_reflns_theta_full        25.19
_diffrn_reflns_theta_max         25.19
_diffrn_reflns_theta_min         3.08
_diffrn_standards_decay_%        0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.220
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  0.7781
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
Higashi, T. (1995). Program for Absorption Correction.
Rigaku Corporation, Tokyo, Japan.
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.722
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1000
_exptl_crystal_size_max          0.32
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.28
_refine_diff_density_max         0.276
_refine_diff_density_min         -0.346
_refine_diff_density_rms         0.051
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.064
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     141
_refine_ls_number_reflns         1676
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.064
_refine_ls_R_factor_all          0.0309
_refine_ls_R_factor_gt           0.0291
_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^)+(0.0542P)^2^+1.4437P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0852
_refine_ls_wR_factor_ref         0.0866
_reflns_number_gt                1560
_reflns_number_total             1676
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b806210m.txt
_cod_data_source_block           1
_cod_depositor_comments
;
The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'none' 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_cell_volume        1862.4(6)
_cod_original_sg_symbol_H-M      C2/c
_cod_original_formula_sum        'C5 H9 Mg N2 O7.50'
_cod_database_code               7202183