Gelation is crucially dependent on functional group orientation and may be tuned by anion binding.
Piepenbrock, Marc-Oliver M; Lloyd, Gareth O; Clarke, Nigel; Steed, Jonathan W; Chemical communications (Cambridge, England)  (2008) 2644–2646; doi:10.1039/b804259d

data_7103164
_publ_section_title
;
 Gelation is crucially dependent on functional group orientation and
 may be tuned by anion binding.
;
_journal_issue                   23
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              2644
_journal_page_last               2646
_journal_paper_doi               10.1039/b804259d
_journal_year                    2008
_chemical_formula_moiety         'C20 H26 N4 O2'
_chemical_formula_sum            'C20 H26 N4 O2'
_chemical_formula_weight         354.45
_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                 107.849(5)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   12.1914(14)
_cell_length_b                   4.6342(6)
_cell_length_c                   17.341(2)
_cell_measurement_reflns_used    972
_cell_measurement_temperature    120(2)
_cell_measurement_theta_max      23.422
_cell_measurement_theta_min      2.435
_cell_volume                     932.57(19)
_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 0.989
_diffrn_measurement_device_type  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  0.2294
_diffrn_reflns_av_sigmaI/netI    0.2359
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       6
_diffrn_reflns_limit_k_min       -5
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            7921
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         28.24
_diffrn_reflns_theta_min         1.23
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.084
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.262
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             380
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.11
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.472
_refine_diff_density_min         -0.377
_refine_diff_density_rms         0.103
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   4(3)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.896
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     235
_refine_ls_number_reflns         4407
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      0.896
_refine_ls_R_factor_all          0.1602
_refine_ls_R_factor_gt           0.0972
_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^)+(0.1017P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2219
_refine_ls_wR_factor_ref         0.2549
_reflns_number_gt                2170
_reflns_number_total             4407
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b804259d.txt
_cod_data_source_block           z:\xraydata\gareth\07srv312\work\xm
_cod_original_sg_symbol_H-M      P21
_cod_database_code               7103164