An open-framework rutile-type magnesium isonicotinate and its structural analogue with an anatase topology.
Liu, Tingzhi; Luo, Daibing; Xu, Dingguo; Zeng, Hongmei; Lin, Zhien; Dalton transactions (Cambridge, England : 2003) 42 (2013) 368–371; doi:10.1039/c2dt31394d

data_7020647
_publ_section_title
;
 An open-framework rutile-type magnesium isonicotinate and its structural
 analogue with an anatase topology.
;
_journal_issue                   2
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              368
_journal_page_last               371
_journal_paper_doi               10.1039/c2dt31394d
_journal_volume                  42
_journal_year                    2013
_chemical_formula_sum            'C12 H8 Mg N2 O4'
_chemical_formula_weight         268.51
_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                 112.133(7)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   13.9067(8)
_cell_length_b                   10.4327(5)
_cell_length_c                   8.4374(5)
_cell_measurement_reflns_used    1158
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      28.9574
_cell_measurement_theta_min      3.1561
_cell_volume                     1133.93(12)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_detector_area_resol_mean 16.0874
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Xcalibur, Eos'
_diffrn_measurement_method       '\w 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  0.0184
_diffrn_reflns_av_sigmaI/netI    0.0241
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -10
_diffrn_reflns_number            2205
_diffrn_reflns_theta_full        24.99
_diffrn_reflns_theta_max         24.99
_diffrn_reflns_theta_min         3.16
_diffrn_standards_decay_%        none
_diffrn_standards_interval_count none
_diffrn_standards_interval_time  none
_diffrn_standards_number         2735
_exptl_absorpt_coefficient_mu    0.168
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.89403
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.573
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             552
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.16
_exptl_crystal_size_min          0.14
_refine_diff_density_max         0.404
_refine_diff_density_min         -0.169
_refine_diff_density_rms         0.069
_refine_ls_extinction_coef       0.037(5)
_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   1.127
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     115
_refine_ls_number_reflns         998
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.127
_refine_ls_R_factor_all          0.0484
_refine_ls_R_factor_gt           0.0440
_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^)+(0.0746P)^2^+1.3846P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1293
_refine_ls_wR_factor_ref         0.1326
_reflns_number_gt                896
_reflns_number_total             998
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c2dt31394d.txt
_cod_data_source_block           2
_cod_original_cell_volume        1133.93(11)
_cod_original_sg_symbol_H-M      C2/c
_cod_database_code               7020647