Homochiral crystallization of helical coordination chains bridged by achiral ligands: can it be controlled by the ligand structure?
Wang, Yong-Tao; Tong, Ming-Liang; Fan, Hai-Hua; Wang, He-Zhou; Chen, Xiao-Ming; Dalton transactions (Cambridge, England : 2003)  (2005) 424–426; doi:10.1039/b416412a

data_7008070
_publ_section_title
;
 Homochiral crystallization of helical coordination chains bridged by
 achiral ligands: can it be controlled by the ligand structure?
;
_journal_issue                   3
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              424
_journal_page_last               426
_journal_paper_doi               10.1039/b416412a
_journal_year                    2005
_chemical_formula_sum            'C18 H24 Cd I2 N6 O4'
_chemical_formula_weight         754.63
_chemical_name_systematic
;
?
;
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   8.2949(9)
_cell_length_b                   14.7244(17)
_cell_length_c                   21.236(2)
_cell_measurement_temperature    293(2)
_cell_volume                     2593.7(5)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SHELXTL'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.955
_diffrn_measured_fraction_theta_max 0.955
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega 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  0.0450
_diffrn_reflns_av_sigmaI/netI    0.0641
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            15753
_diffrn_reflns_theta_full        28.28
_diffrn_reflns_theta_max         28.28
_diffrn_reflns_theta_min         1.68
_exptl_absorpt_coefficient_mu    3.255
_exptl_absorpt_correction_T_max  0.8286
_exptl_absorpt_correction_T_min  0.6658
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Sheldrick, 1996)'
_exptl_crystal_colour            pale-yellow
_exptl_crystal_density_diffrn    1.932
_exptl_crystal_density_meas      0
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             1440
_exptl_crystal_size_max          0.14
_exptl_crystal_size_mid          0.07
_exptl_crystal_size_min          0.06
_refine_diff_density_max         1.159
_refine_diff_density_min         -0.479
_refine_diff_density_rms         0.155
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.02(3)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.023
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     280
_refine_ls_number_reflns         5995
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.023
_refine_ls_R_factor_all          0.0530
_refine_ls_R_factor_gt           0.0453
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0425P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0946
_refine_ls_wR_factor_ref         0.0983
_reflns_number_gt                5294
_reflns_number_total             5995
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b416412a.txt
_cod_data_source_block           compound_3
_cod_original_cell_volume        2593.8(5)
_cod_original_sg_symbol_H-M      P2(1)2(1)2(1)
_cod_database_code               7008070