Crystal structures of hydrates of simple inorganic salts. I. Water-rich magnesium halide hydrates MgCl~2~·8H~2~O, MgCl~2~·12H~2~O, MgBr~2~·6H~2~O, MgBr~2~·9H~2~O, MgI~2~·8H~2~O and MgI~2~·9H~2~O
Hennings, Erik; Schmidt, Horst; Voigt, Wolfgang; Acta Crystallographica Section C 69 (2013) 1292–1300; doi:10.1107/S0108270113028138

data_2019270
_publ_section_title
;
 Crystal structures of hydrates of simple inorganic salts. I. Water-rich
 magnesium halide hydrates MgCl~2~&#x00B7;8H~2~O, MgCl~2~&#x00B7;12H~2~O,
 MgBr~2~&#x00B7;6H~2~O, MgBr~2~&#x00B7;9H~2~O, MgI~2~&#x00B7;8H~2~O and
 MgI~2~&#x00B7;9H~2~O
;
_journal_coeditor_code           QS3030
_journal_issue                   11
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              1292
_journal_page_last               1300
_journal_paper_doi               10.1107/S0108270113028138
_journal_volume                  69
_journal_year                    2013
_chemical_formula_iupac          'Mg Cl2 , 12H2 O'
_chemical_formula_moiety         'H12 Mg O6, 2(Cl), 6(H2 O)'
_chemical_formula_sum            'Cl2 H24 Mg O12'
_chemical_formula_weight         311.40
_chemical_name_common            'magnesium chloride dodecahydrate'
_chemical_name_systematic
;
Magnesium chloride dodecahydrate
;
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2yn'
_space_group_name_H-M_alt        'P 1 21/n 1'
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 1'
_atom_sites_solution_hydrogens   difmap
_audit_creation_method           SHELXL-2012
_cell_angle_alpha                90
_cell_angle_beta                 113.44(2)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   7.3496(16)
_cell_length_b                   14.419(3)
_cell_length_c                   8.570(3)
_cell_measurement_reflns_used    1803
_cell_measurement_temperature    150
_cell_measurement_theta_max      29.54
_cell_measurement_theta_min      2.94
_cell_volume                     833.2(4)
_computing_cell_refinement       'X-AREA (Stoe & Cie, 2009)'
_computing_data_collection       'X-AREA (Stoe & Cie, 2009)'
_computing_data_reduction        'X-RED (Stoe & Cie, 2009)'
_computing_molecular_graphics    'DIAMOND (Brandenburg, 2006)'
_computing_publication_material  'publCIF (Westrip, 2010)'
_computing_structure_refinement  'SHELXL2012 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      150
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Stoe IPDS 2T'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.1284
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       1
_diffrn_reflns_limit_l_min       -11
_diffrn_reflns_number            1918
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         27.498
_diffrn_reflns_theta_min         2.825
_exptl_absorpt_coefficient_mu    0.462
_exptl_absorpt_correction_T_max  0.7818
_exptl_absorpt_correction_T_min  0.6639
_exptl_absorpt_correction_type   integration
_exptl_absorpt_process_details   '(Coppens, 1970)'
_exptl_crystal_density_diffrn    1.241
_exptl_crystal_F_000             332
_exptl_crystal_size_max          0.981
_exptl_crystal_size_mid          0.757
_exptl_crystal_size_min          0.533
_refine_diff_density_max         0.977
_refine_diff_density_min         -0.616
_refine_ls_extinction_coef       0.072(11)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL2012 (Sheldrick, 2008)'
_refine_ls_goodness_of_fit_ref   1.044
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     119
_refine_ls_number_reflns         1916
_refine_ls_number_restraints     18
_refine_ls_restrained_S_all      1.039
_refine_ls_R_factor_all          0.0536
_refine_ls_R_factor_gt           0.0478
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w = 1/[\s^2^(Fo^2^)+(0.1155P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1316
_refine_ls_wR_factor_ref         0.1408
_reflns_number_gt                1649
_reflns_number_total             1916
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            qs3030.cif
_cod_data_source_block           MgCl2_12H2O
_cod_database_code               2019270
_shelx_hkl_checksum              14016
_shelx_res_checksum              61322
_shelxl_version_number           .000002012