Unprecedented helix-based microporous metal-organic frameworks constructed from a single ligand.
Sang, Rui-Li; Xu, Li; Chemical communications (Cambridge, England)  (2008) 6143–6145; doi:10.1039/b814524e

data_7103584
_publ_section_title
;
 Unprecedented helix-based microporous metal-organic frameworks
 constructed from a single ligand.
;
_journal_issue                   46
_journal_name_full
'Chemical communications (Cambridge, England)'
_journal_page_first              6143
_journal_page_last               6145
_journal_paper_doi               10.1039/b814524e
_journal_year                    2008
_chemical_formula_sum            'C12 H16 N4 O6 Pb'
_chemical_formula_weight         519.48
_chemical_name_common
'aqua(1,1'-di(propionic acid)-2,2;-biimidazole)lead(ii) hydrate'
_chemical_name_systematic
;
aqua(1,1'-di(propionic acid)-2,2;-biimidazole)lead(II) hydrate
;
_space_group_IT_number           167
_symmetry_cell_setting           trigonal
_symmetry_space_group_name_Hall  '-R 3 2"c'
_symmetry_space_group_name_H-M   'R -3 c :H'
_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            18
_cell_length_a                   27.4599(8)
_cell_length_b                   27.4599(8)
_cell_length_c                   12.5722(6)
_cell_measurement_reflns_used    6942
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      27.4719
_cell_measurement_theta_min      2.5693
_cell_volume                     8209.9(5)
_computing_cell_refinement       'CrystalClear (Rigaku/MSC Inc., 2005)'
_computing_data_collection       'CrystalClear (Rigaku/MSC Inc., 2005)'
_computing_data_reduction        'CrystalClear (Rigaku/MSC Inc., 2005)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_detector_area_resol_mean 28.5714
_diffrn_measured_fraction_theta_full 0.952
_diffrn_measured_fraction_theta_max 0.952
_diffrn_measurement_method       CCD_Profile_fitting
_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  0.0385
_diffrn_reflns_av_sigmaI/netI    0.0169
_diffrn_reflns_limit_h_max       35
_diffrn_reflns_limit_h_min       -35
_diffrn_reflns_limit_k_max       23
_diffrn_reflns_limit_k_min       -35
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            20059
_diffrn_reflns_theta_full        27.48
_diffrn_reflns_theta_max         27.48
_diffrn_reflns_theta_min         4.07
_exptl_absorpt_coefficient_mu    9.279
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  0.8098
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Sheldrick, 1996)'
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.891
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Prism
_exptl_crystal_F_000             4428
_exptl_crystal_size_max          0.5400
_exptl_crystal_size_mid          0.0400
_exptl_crystal_size_min          0.0300
_refine_diff_density_max         1.746
_refine_diff_density_min         -0.694
_refine_diff_density_rms         0.109
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.192
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     126
_refine_ls_number_reflns         2005
_refine_ls_number_restraints     6
_refine_ls_restrained_S_all      1.191
_refine_ls_R_factor_all          0.0323
_refine_ls_R_factor_gt           0.0293
_refine_ls_shift/su_max          0.013
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0244P)^2^+50.7988P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0616
_refine_ls_wR_factor_ref         0.0630
_reflns_number_gt                1882
_reflns_number_total             2005
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            B814524E.txt
_cod_data_source_block           PBpra2bim
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Trigonal' changed to 'trigonal' according
to '/home/saulius/struct/CIF-dictionaries/cif_core.dic' dictionary named
'cif_core.dic' version 2.4.1 from
2010-06-29.

'_exptl_absorpt_correction_type' value 'Multi-scan' changed
to 'multi-scan' 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_sg_symbol_H-M      R-3c
_cod_database_code               7103584