Unexpected helicity control and helix inversion: homochiral helical nanotubes consisting of an achiral ligand
Kaiju Wei; Jia Ni; Yuanzeng Min; Siming Chen; Yangzhong Liu; Chem.Commun. 49 (2013) 8220–; doi:10.1039/c3cc43898h

data_7109715
_publ_section_title
;
 Unexpected helicity control and helix inversion: homochiral helical
 nanotubes consisting of an achiral ligand
;
_journal_name_full               Chem.Commun.
_journal_page_first              8220
_journal_paper_doi               10.1039/c3cc43898h
_journal_volume                  49
_journal_year                    2013
_chemical_formula_sum            'C26 H26 N6 O3'
_chemical_formula_weight         470.53
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 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                 110.613(5)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   15.439(3)
_cell_length_b                   8.1148(18)
_cell_length_c                   20.524(5)
_cell_measurement_temperature    273(2)
_cell_volume                     2406.7(9)
_computing_cell_refinement       'SAINT (Bruker, 2002)'
_computing_data_collection       'SMART (Bruker, 2002)'
_computing_data_reduction        SAINT
_computing_molecular_graphics    'ORTEP-II (Johnson, 1976)'
_computing_publication_material  SHELXL-97
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.963
_diffrn_measured_fraction_theta_max 0.963
_diffrn_measurement_device_type  'Bruker APEX area-dectector diffractometer'
_diffrn_measurement_method       '\f and \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  0.0429
_diffrn_reflns_av_sigmaI/netI    0.0773
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -18
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            8075
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         2.12
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.088
_exptl_absorpt_correction_T_max  0.9783
_exptl_absorpt_correction_T_min  0.9723
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Bruker, 2002)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.299
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             992
_exptl_crystal_size_max          0.32
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.25
_refine_diff_density_max         0.231
_refine_diff_density_min         -0.350
_refine_diff_density_rms         0.051
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.004
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     316
_refine_ls_number_reflns         4092
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.004
_refine_ls_R_factor_all          0.1534
_refine_ls_R_factor_gt           0.0785
_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^)+(0.0588P)^2^+2.2836P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1759
_refine_ls_wR_factor_ref         0.2195
_reflns_number_gt                1923
_reflns_number_total             4092
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c3cc43898h.txt
_cod_data_source_block           ligand_bpab
_cod_original_cell_volume        2406.8(9)
_cod_original_sg_symbol_H-M      P2(1)/c
_cod_database_code               7109715