A Zn-oxalate helix linked by a water helix: spontaneous chiral resolution of a Zn helical coordination polymer
Mei, Hong-Xin; Zhang, Ting; Wang, Dan-Feng; Huang, Rong-Bin; Zheng, Lan-Sun; New J. Chem. 39 (2015) 2075–; doi:10.1039/C4NJ02017K

data_7054626
_publ_section_title
;
 A Zn-oxalate helix linked by a water helix: spontaneous chiral resolution
 of a Zn helical coordination polymer
;
_journal_issue                   3
_journal_name_full               'New J. Chem.'
_journal_page_first              2075
_journal_paper_doi               10.1039/C4NJ02017K
_journal_volume                  39
_journal_year                    2015
_chemical_formula_moiety         'C2 H4 O6 Zn, 2(H2 O)'
_chemical_formula_sum            'C2 H8 O8 Zn'
_chemical_formula_weight         225.47
_chemical_name_systematic
;
 ? 
;
_space_group_IT_number           154
_space_group_name_Hall           'P 32 2"'
_space_group_name_H-M_alt        'P 32 2 1'
_symmetry_cell_setting           trigonal
_symmetry_space_group_name_Hall  'P 32 2"'
_symmetry_space_group_name_H-M   'P 32 2 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_audit_update_record
;
2015-01-05 deposited with the CCDC.
2015-01-07 downloaded from the CCDC.
;
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                120.00
_cell_formula_units_Z            3
_cell_length_a                   7.4200(3)
_cell_length_b                   7.4200(3)
_cell_length_c                   12.1100(7)
_cell_measurement_reflns_used    887
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      27.46
_cell_measurement_theta_min      3.17
_cell_volume                     577.41(5)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SMART'
_computing_molecular_graphics    'DIAMOND (Brandenburg, 1999)'
_computing_publication_material  SHELXTL
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker SMART CCD'
_diffrn_measurement_method       'w scan'
_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  0.0622
_diffrn_reflns_av_unetI/netI     0.0379
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            5617
_diffrn_reflns_theta_full        27.46
_diffrn_reflns_theta_max         27.46
_diffrn_reflns_theta_min         3.17
_exptl_absorpt_coefficient_mu    3.194
_exptl_absorpt_correction_T_max  0.68
_exptl_absorpt_correction_T_min  0.53
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Bruker, 2002)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.945
_exptl_crystal_density_meas      'not measured'
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       rod
_exptl_crystal_F_000             342
_exptl_crystal_size_max          0.56
_exptl_crystal_size_mid          0.16
_exptl_crystal_size_min          0.12
_refine_diff_density_max         0.358
_refine_diff_density_min         -0.454
_refine_diff_density_rms         0.085
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.0(4)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.052
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     57
_refine_ls_number_reflns         887
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.052
_refine_ls_R_factor_all          0.0405
_refine_ls_R_factor_gt           0.0365
_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^)+(0.0100P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0712
_refine_ls_wR_factor_ref         0.0732
_reflns_number_gt                821
_reflns_number_total             887
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c4nj02017k1.cif
_cod_data_source_block           p1
_cod_depositor_comments
'Adding full bibliography for 7054625--7054626.cif.'
_cod_original_sg_symbol_Hall     'P 32 2" '
_cod_original_formula_sum        'C2 H8 O8 Zn '
_cod_database_code               7054626