Invisible but Common Motion in Organic Crystals: A Pedal Motion in Stilbenes and Azobenzenes
Jun Harada; Keiichiro Ogawa; Journal of the American Chemical Society 123 (2001) 10884–10888; doi:10.1021/ja011197d

data_4115757
_publ_section_title
;
 Invisible but Common Motion in Organic Crystals: A Pedal Motion in
 Stilbenes and Azobenzenes
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              10884
_journal_page_last               10888
_journal_paper_doi               10.1021/ja011197d
_journal_volume                  123
_journal_year                    2001
_chemical_formula_sum            'C16 H18 N2'
_chemical_formula_weight         238.32
_chemical_melting_point          433
_chemical_name_systematic
;
(E)-3,3',4,4'-tetramethylazobenzene
;
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   difmap
_atom_sites_solution_primary     direct
_audit_creation_method           SHELXL-97
_cell_angle_alpha                67.502(2)
_cell_angle_beta                 74.118(2)
_cell_angle_gamma                79.837(2)
_cell_formula_units_Z            1
_cell_length_a                   6.8119(7)
_cell_length_b                   7.1517(8)
_cell_length_c                   7.6887(8)
_cell_measurement_reflns_used    2079
_cell_measurement_temperature    300
_cell_measurement_theta_max      27.5
_cell_measurement_theta_min      2.9
_cell_volume                     331.76(6)
_computing_cell_refinement       'SAINT (Bruker, 1998)'
_computing_data_collection       'SMART (Bruker, 1998)'
_computing_data_reduction        SAINT
_computing_molecular_graphics    'SHELXTL (Sheldrick, 1997)'
_computing_publication_material  SHELXTL
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      300
_diffrn_detector_area_resol_mean 8.192
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker SMART 1000 CCD diffractometer'
_diffrn_measurement_method       \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  0.0083
_diffrn_reflns_av_sigmaI/netI    0.0109
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       9
_diffrn_reflns_limit_l_min       -9
_diffrn_reflns_number            4235
_diffrn_reflns_theta_full        27.53
_diffrn_reflns_theta_max         27.53
_diffrn_reflns_theta_min         2.94
_diffrn_standards_decay_%        0
_exptl_absorpt_coefficient_mu    0.071
_exptl_absorpt_correction_T_max  0.9944
_exptl_absorpt_correction_T_min  0.9588
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Sheldrick, 1996)'
_exptl_crystal_colour            red
_exptl_crystal_density_diffrn    1.193
_exptl_crystal_description       plate
_exptl_crystal_F_000             128
_exptl_crystal_size_max          0.60
_exptl_crystal_size_mid          0.60
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.191
_refine_diff_density_min         -0.231
_refine_diff_density_rms         0.056
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.044
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     118
_refine_ls_number_reflns         1522
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.044
_refine_ls_R_factor_all          0.0601
_refine_ls_R_factor_gt           0.0489
_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^)+(0.0934P)^2^+0.0347P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1408
_refine_ls_wR_factor_ref         0.1511
_reflns_number_gt                1170
_reflns_number_total             1522
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja011197d_5.cif
_cod_data_source_block           34mert
_cod_database_code               4115757