Computational prediction and experimental verification of pyridine-based helical oligoamides containing four repeating units per helical turn
'Wei Qiang Ong; Huaiqing Zhao; Zhiyun Du; Jared Ze Yang Yeh; Changliang Ren; Leon Zhen Wei Tan; Kun Zhang; Huaqiang Zeng; Chem.Commun. 47 (2011) 6416–; doi:10.1039/c1cc11532d

data_7106464
_publ_section_title
;
 Computational prediction and experimental verification of pyridine-based
 helical oligoamides containing four repeating units per helical turn
;
_journal_name_full               Chem.Commun.
_journal_page_first              6416
_journal_paper_doi               10.1039/c1cc11532d
_journal_volume                  47
_journal_year                    2011
_chemical_formula_sum            'C37 H32 N10 O8'
_chemical_formula_weight         744.73
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 1'
_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                 97.306(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   8.0823(7)
_cell_length_b                   16.6905(14)
_cell_length_c                   25.880(2)
_cell_measurement_reflns_used    990
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      24.30
_cell_measurement_theta_min      2.57
_cell_volume                     3462.8(5)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_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      100(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_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  0.0336
_diffrn_reflns_av_sigmaI/netI    0.0444
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       21
_diffrn_reflns_limit_k_min       -21
_diffrn_reflns_limit_l_max       33
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            24661
_diffrn_reflns_theta_full        27.49
_diffrn_reflns_theta_max         27.49
_diffrn_reflns_theta_min         1.59
_exptl_absorpt_coefficient_mu    0.104
_exptl_absorpt_correction_T_max  0.9749
_exptl_absorpt_correction_T_min  0.8267
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Sadabs, (Sheldrick 2001)'
_exptl_crystal_colour            Colourless
_exptl_crystal_density_diffrn    1.428
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Block
_exptl_crystal_F_000             1552
_exptl_crystal_size_max          0.44
_exptl_crystal_size_mid          0.26
_exptl_crystal_size_min          0.12
_refine_diff_density_max         0.608
_refine_diff_density_min         -0.506
_refine_diff_density_rms         0.064
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.065
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     572
_refine_ls_number_reflns         7945
_refine_ls_number_restraints     116
_refine_ls_restrained_S_all      1.093
_refine_ls_R_factor_all          0.0722
_refine_ls_R_factor_gt           0.0542
_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^)+(0.0758P)^2^+1.0342P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1351
_refine_ls_wR_factor_ref         0.1437
_reflns_number_gt                6080
_reflns_number_total             7945
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c1cc11532d.txt
_cod_data_source_block           b042
_cod_depositor_comments
;
The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'Not Measured' was changed to '?'
- the value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 
;
_cod_original_sg_symbol_H-M      P2(1)/n
_cod_database_code               7106464