Remarkable substitution influence on the mechanochromism of cyanostilbene derivatives
Zhao, He; Wang, Yongtao; Harrington, Steven; Ma, Lei; Hu, Shuzhi; Wu, Xue; Tang, Huan; Xue, Mei; Wang, Yubin; RSC Adv. 6 (2016) 66477–; doi:10.1039/C6RA14707K

data_7225920
_publ_section_title
;
 Remarkable substitution influence on the mechanochromism of cyanostilbene
 derivatives
;
_journal_issue                   71
_journal_name_full               'RSC Adv.'
_journal_page_first              66477
_journal_paper_doi               10.1039/C6RA14707K
_journal_volume                  6
_journal_year                    2016
_chemical_formula_moiety         'C28 H20 N2'
_chemical_formula_sum            'C28 H20 N2'
_chemical_formula_weight         384.46
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_audit_creation_date             2016-01-16
_audit_creation_method
;
Olex2 1.2
(compiled 2015.09.30 svn.r3233 for OlexSys, GUI svn.r5103)
;
_audit_update_record
;
2016-04-16 deposited with the CCDC.
2016-07-07 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 103.642(4)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   16.517(4)
_cell_length_b                   13.934(3)
_cell_length_c                   9.048(2)
_cell_measurement_reflns_used    2958
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      6.21
_cell_measurement_theta_min      54.77
_cell_volume                     2023.6(8)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SMART'
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'XL (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      296.15
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0602
_diffrn_reflns_av_unetI/netI     0.0592
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.999
_diffrn_reflns_limit_h_max       19
_diffrn_reflns_limit_h_min       -19
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       8
_diffrn_reflns_limit_l_min       -10
_diffrn_reflns_number            11762
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.999
_diffrn_reflns_theta_full        25.192
_diffrn_reflns_theta_max         25.192
_diffrn_reflns_theta_min         1.269
_exptl_absorpt_coefficient_mu    0.074
_exptl_absorpt_correction_T_max  0.9839
_exptl_absorpt_correction_T_min  0.9803
_exptl_absorpt_correction_type   'Semi-empirical from equivalents'
_exptl_absorpt_process_details   'SADABS; Bruker, 2000'
_exptl_crystal_density_diffrn    1.262
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             808
_exptl_crystal_size_max          0.27
_exptl_crystal_size_mid          0.25
_exptl_crystal_size_min          0.22
_refine_diff_density_max         0.213
_refine_diff_density_min         -0.149
_refine_diff_density_rms         0.039
_refine_ls_extinction_coef       0.0096(14)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL-2014/7 (Sheldrick 2014'
_refine_ls_goodness_of_fit_ref   0.954
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     273
_refine_ls_number_reflns         3637
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.954
_refine_ls_R_factor_all          0.1029
_refine_ls_R_factor_gt           0.0516
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0659P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1164
_refine_ls_wR_factor_ref         0.1429
_reflns_Friedel_coverage         0.000
_reflns_number_gt                2062
_reflns_number_total             3637
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c6ra14707k2.cif
_cod_data_source_block           c
_cod_original_cell_volume        2023.7(8)
_cod_database_code               7225920
_shelx_estimated_absorpt_t_max   0.984
_shelx_estimated_absorpt_t_min   0.980
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups
 At 1.5 times of:
  All C(H,H,H) groups
2.a Aromatic/amide H refined with riding coordinates:
 C2(H2), C3(H3), C5(H5), C8(H8), C9(H9), C10(H10), C11(H11), C16(H16),
 C17(H17), C19(H19), C20(H20), C22(H22), C24(H24), C25(H25), C26(H26), C27(H27),
  C28(H28)
2.b Idealised Me refined as rotating group:
 C21(H21A,H21B,H21C)
;
_shelx_res_checksum              17445
_shelx_hkl_checksum              55952
_shelx_shelxl_version_number     2014/7
_olex2_submission_special_instructions 'No special instructions were received'