Mesoscopic-scale sheet-like assembly: critical role of inter-tape hydrogen bonds in the organogel formation and gel–liquid crystal transition of an alkylsilylated deoxyguanosine–dodecane system
Takafumi Sato; Masayuki Seko; Ryoichi Takasawa; Isao Yoshikawa; Koji Araki; J. Mater. Chem. 11 () 3018–3022; doi:10.1039/b105000c

data_7204171
_publ_section_title
;
 Mesoscopic-scale sheet-like assembly: critical role of inter-tape
 hydrogen bonds in the organogel formation and gel--liquid crystal
 transition of an alkylsilylated deoxyguanosine--dodecane system
;
_journal_issue                   12
_journal_name_full               'J. Mater. Chem.'
_journal_page_first              3018
_journal_page_last               3022
_journal_paper_doi               10.1039/b105000c
_journal_volume                  11
_chemical_formula_moiety         'C28 H53 N5 O4 Si2'
_chemical_formula_sum            'C28 H53 N5 O4 Si2'
_chemical_formula_weight         579.92
_chemical_name_systematic
; 
2'-deoxy-3',5'-O-bis(triisopropylsilyl)-guanosine
;
_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                 112.716(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   17.0140(4)
_cell_length_b                   11.2140(3)
_cell_length_c                   18.4050(4)
_cell_measurement_reflns_used    28374
_cell_measurement_temperature    100
_cell_measurement_theta_max      73.11
_cell_measurement_theta_min      2.82
_cell_volume                     3239.19(14)
_computing_cell_refinement       Scalepack
_computing_data_collection       'MacScience Xpress'
_computing_data_reduction        'Denzo and Scalepack'
_computing_molecular_graphics    maXus
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      100
_diffrn_measurement_device_type  'MacScience DIPlabo'
_diffrn_measurement_method       IP
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.031
_diffrn_reflns_av_sigmaI/netI    0.0209
_diffrn_reflns_limit_h_max       20
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            28374
_diffrn_reflns_theta_max         73.11
_diffrn_reflns_theta_min         2.82
_exptl_absorpt_coefficient_mu    1.306
_exptl_absorpt_correction_T_max  0.8479
_exptl_absorpt_correction_T_min  0.7064
_exptl_absorpt_correction_type   integration
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.189
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             1264
_exptl_crystal_size_max          0.45
_exptl_crystal_size_min          0.18
_refine_diff_density_max         0.731
_refine_diff_density_min         -0.449
_refine_diff_density_rms         0.073
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.18(3)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.052
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     706
_refine_ls_number_reflns         8328
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.052
_refine_ls_R_factor_all          0.0552
_refine_ls_R_factor_gt           0.0547
_refine_ls_shift/su_max          0.024
_refine_ls_shift/su_mean         0.002
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1027P)^2^+3.1674P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1514
_refine_ls_wR_factor_ref         0.1535
_reflns_number_gt                8271
_reflns_number_total             8328
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b105000c.txt
_cod_data_source_block           35TIPS-dG
_cod_original_sg_symbol_H-M      p21
_cod_database_code               7204171