Chiroptical Activity from an Achiral Biological Metal-Organic Framework.
Xu, Li-Li; Zhang, Hai-Feng; Li, Mian; Ng, Seik Weng; Feng, Jiang-He; Mao, Jiang-Gao; Li, Dan; Journal of the American Chemical Society 140 (2018) 11569–11572; doi:10.1021/jacs.8b06725

data_4132807
_publ_section_title
;
 Chiroptical Activity from an Achiral Biological Metal-Organic Framework.
;
_journal_issue                   37
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              11569
_journal_page_last               11572
_journal_paper_doi               10.1021/jacs.8b06725
_journal_volume                  140
_journal_year                    2018
_chemical_formula_moiety         'Zn (C5 H5 N5) (C6 H2 O5), 0.5(C3 H7 N O)'
_chemical_formula_sum            'C12.5 H10.5 N5.5 O5.5 Zn'
_chemical_formula_weight         391.13
_space_group_crystal_system      tetragonal
_space_group_IT_number           119
_space_group_name_Hall           'I -4 -2'
_space_group_name_H-M_alt        'I -4 m 2'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2014/6
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   15.6362(1)
_cell_length_b                   15.6362
_cell_length_c                   13.9515(1)
_cell_measurement_reflns_used    7549
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      74.3340
_cell_measurement_theta_min      3.9790
_cell_volume                     3411.01(3)
_computing_structure_refinement  'SHELXL-2014/6 (Sheldrick, 2014)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.986
_diffrn_measured_fraction_theta_max 0.980
_diffrn_measurement_device_type  'Enhance (Cu) X-ray Source'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0163
_diffrn_reflns_av_unetI/netI     0.0084
_diffrn_reflns_Laue_measured_fraction_full 0.986
_diffrn_reflns_Laue_measured_fraction_max 0.980
_diffrn_reflns_limit_h_max       19
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            8004
_diffrn_reflns_point_group_measured_fraction_full 0.990
_diffrn_reflns_point_group_measured_fraction_max 0.984
_diffrn_reflns_theta_full        67.684
_diffrn_reflns_theta_max         74.738
_diffrn_reflns_theta_min         4.247
_exptl_absorpt_coefficient_mu    2.356
_exptl_absorpt_correction_T_max  1.000
_exptl_absorpt_correction_T_min  0.239
_exptl_absorpt_correction_type   gaussian
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.523
_exptl_crystal_description       prism
_exptl_crystal_F_000             1584
_exptl_crystal_size_max          0.500
_exptl_crystal_size_mid          0.400
_exptl_crystal_size_min          0.300
_refine_diff_density_max         0.430
_refine_diff_density_min         -0.510
_refine_diff_density_rms         0.089
_refine_ls_abs_structure_details
;
 Refined as an inversion twin.
;
_refine_ls_abs_structure_Flack   0.03(5)
_refine_ls_extinction_coef       0.0044(2)
_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   1.026
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     110
_refine_ls_number_reflns         1826
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.026
_refine_ls_R_factor_all          0.0279
_refine_ls_R_factor_gt           0.0279
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0558P)^2^+4.1685P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0792
_refine_ls_wR_factor_ref         0.0792
_reflns_Friedel_coverage         0.837
_reflns_Friedel_fraction_full    0.996
_reflns_Friedel_fraction_max     0.988
_reflns_number_gt                1826
_reflns_number_total             1826
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ZnFDCA_negative.cif
_cod_data_source_block           zn
_cod_original_cell_volume        3411.01(5)
_cod_database_code               4132807
_shelx_estimated_absorpt_t_min   0.385
_shelx_estimated_absorpt_t_max   0.538
_shelxl_version_number           2014/6
_shelx_res_checksum              96372
_shelx_hkl_checksum              65561
_shelx_fab_checksum              13750