Anion tuning of chiral bis(urea) low molecular weight gels
Lloyd, Gareth O.; Piepenbrock, Marc-Oliver M.; Foster, Jonathan A.; Clarke, Nigel; Steed, Jonathan W.; Soft Matter 8 (2012) 204–; doi:10.1039/c1sm06448g

data_1515354
_publ_section_title
;
 Anion tuning of chiral bis(urea) low molecular weight gels
;
_journal_issue                   1
_journal_name_full               'Soft Matter'
_journal_page_first              204
_journal_paper_doi               10.1039/c1sm06448g
_journal_volume                  8
_journal_year                    2012
_chemical_formula_moiety         'C23 H32 N4 O2'
_chemical_formula_sum            'C23 H32 N4 O2'
_chemical_formula_weight         396.53
_chemical_name_systematic
;
?
;
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 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                 107.519(4)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   12.317(2)
_cell_length_b                   4.6108(8)
_cell_length_c                   19.488(3)
_cell_measurement_reflns_used    861
_cell_measurement_temperature    120(2)
_cell_measurement_theta_max      27.657
_cell_measurement_theta_min      2.193
_cell_volume                     1055.4(3)
_computing_cell_refinement       Saint
_computing_data_collection       Smart
_computing_data_reduction        Saint
_computing_molecular_graphics    Xseed
_computing_publication_material  Xseed
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      120(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  Smart-6k
_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  0.0499
_diffrn_reflns_av_sigmaI/netI    0.0867
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       5
_diffrn_reflns_limit_k_min       -5
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            7923
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         27.54
_diffrn_reflns_theta_min         1.10
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.081
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.248
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       'flat needles'
_exptl_crystal_F_000             428
_exptl_crystal_size_max          0.49
_exptl_crystal_size_mid          0.24
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.362
_refine_diff_density_min         -0.306
_refine_diff_density_rms         0.069
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -2(2)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.018
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     262
_refine_ls_number_reflns         4625
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.017
_refine_ls_R_factor_all          0.1040
_refine_ls_R_factor_gt           0.0624
_refine_ls_shift/su_max          0.005
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0809P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1354
_refine_ls_wR_factor_ref         0.1628
_reflns_number_gt                3061
_reflns_number_total             4625
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c1sm06448g.txt
_cod_data_source_block           z:\xraydata\marc\07srv400\work\xm
_cod_original_sg_symbol_H-M      P21
_cod_database_code               1515354