Synthesis, structures and properties of a series of novel left- and right-handed metal coordination double helicates with chiral channels
Wu, Chuan-De; Lu, Can-Zhong; Lu, Shao-Fang; Zhuang, Hong-Hui; Huang, Jin-Shun; Dalton Transactions  (2003) 3192–; doi:10.1039/b303943a

data_7013061
_publ_section_title
;
 Synthesis, structures and properties of a series of novel left- and
 right-handed metal coordination double helicates with chiral channels
;
_journal_issue                   16
_journal_name_full               'Dalton Transactions'
_journal_page_first              3192
_journal_paper_doi               10.1039/b303943a
_journal_year                    2003
_chemical_formula_sum            'C8 H28 Gd Mo2 N O26'
_chemical_formula_weight         903.44
_chemical_name_systematic
;
?
;
_space_group_IT_number           179
_symmetry_cell_setting           hexagonal
_symmetry_space_group_name_Hall  'P 65 2 (0 0 1)'
_symmetry_space_group_name_H-M   'P 65 2 2'
_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                120.00
_cell_formula_units_Z            6
_cell_length_a                   15.2980(2)
_cell_length_b                   15.2980(2)
_cell_length_c                   18.6613(3)
_cell_measurement_reflns_used    7371
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      25.09
_cell_measurement_theta_min      2.66
_cell_volume                     3782.18(9)
_computing_cell_refinement       'Siemens SMART & SAINT'
_computing_data_collection       'Siemens SMART'
_computing_data_reduction        'Siemens XPREP'
_computing_structure_refinement  'Siemens SHELXTL'
_computing_structure_solution    'Siemens SHELXTL'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.993
_diffrn_measured_fraction_theta_max 0.993
_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  0.0382
_diffrn_reflns_av_sigmaI/netI    0.0344
_diffrn_reflns_limit_h_max       18
_diffrn_reflns_limit_h_min       -18
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -18
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -9
_diffrn_reflns_number            11499
_diffrn_reflns_theta_full        25.09
_diffrn_reflns_theta_max         25.09
_diffrn_reflns_theta_min         2.66
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  .
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    3.692
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  0.8555
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   'SADABS (Sheldrick, 1996)'
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    2.380
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Prism
_exptl_crystal_F_000             2634
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.12
_exptl_crystal_size_min          0.06
_refine_diff_density_max         0.513
_refine_diff_density_min         -0.409
_refine_diff_density_rms         0.089
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.001(1)
_refine_ls_extinction_coef       0.00026(10)
_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   1.087
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     187
_refine_ls_number_reflns         2253
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.087
_refine_ls_R_factor_gt           0.0257
_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^)+(0.0288P)^2^+3.8408P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0597
_refine_ls_wR_factor_ref         0.0629
_reflns_number_gt                2038
_reflns_number_total             2253
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b303943a.txt
_cod_data_source_block           B301542D
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Hexagonal' changed to 'hexagonal'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 
;
_cod_original_cell_volume        3782.2(1)
_cod_original_sg_symbol_H-M      P6522
_cod_database_code               7013061
_refine_ls_r_factor_ref          0.0333