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_2019275
_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 I2 , 8H2 O'
_chemical_formula_moiety         'Mg I2, 8(H2 O)'
_chemical_formula_sum            'H16 I2 Mg O8'
_chemical_formula_weight         422.24
_chemical_name_common            'magnesium iodide octahydrate'
_chemical_name_systematic
;
Magnesium diiodide octahydrate
;
_space_group_crystal_system      orthorhombic
_space_group_IT_number           64
_space_group_name_Hall           '-C 2ac 2'
_space_group_name_H-M_alt        'C m c a'
_symmetry_space_group_name_Hall  '-C 2ac 2'
_symmetry_space_group_name_H-M   'C m c a'
_atom_sites_solution_hydrogens   difmap
_audit_creation_method           SHELXL-2012
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   8.5256(7)
_cell_length_b                   15.6980(17)
_cell_length_c                   9.8671(12)
_cell_measurement_reflns_used    5956
_cell_measurement_temperature    200
_cell_measurement_theta_max      29.54
_cell_measurement_theta_min      2.05
_cell_volume                     1320.6(2)
_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      200
_diffrn_detector_area_resol_mean 6.67
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Stoe IPDS 2'
_diffrn_measurement_method       'rotation method'
_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  0.0000
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       21
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            951
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         29.109
_diffrn_reflns_theta_min         2.595
_exptl_absorpt_coefficient_mu    4.815
_exptl_absorpt_correction_type   none
_exptl_crystal_density_diffrn    2.124
_exptl_crystal_F_000             792
_refine_diff_density_max         0.804
_refine_diff_density_min         -0.776
_refine_ls_extinction_coef       0.0015(2)
_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   1.022
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     52
_refine_ls_number_reflns         950
_refine_ls_number_restraints     6
_refine_ls_restrained_S_all      1.019
_refine_ls_R_factor_all          0.0257
_refine_ls_R_factor_gt           0.0224
_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^)+(0.0414P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0520
_refine_ls_wR_factor_ref         0.0531
_reflns_number_gt                840
_reflns_number_total             950
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            qs3030.cif
_cod_data_source_block           MgI2_8H2O
_cod_original_sg_symbol_Hall     '-C 2bc 2'
_cod_database_code               2019275
_shelx_hkl_checksum              991
_shelx_res_checksum              97919
_shelxl_version_number           .000002012