Racemates Have Much Higher Solid-State Fluorescence Efficiency than Their Levo- and Dextrorotary Enantiomers
Zhu, Qiuhua; Dai, Chenshu; Huang, Cuihong; Zheng, Sichao; Tian, Yuanxin; The Journal of Physical Chemistry C 121 (2017) 25503–; doi:10.1021/acs.jpcc.7b09170

data_1554101
_publ_section_title
;
 Racemates Have Much Higher Solid-State Fluorescence Efficiency than Their
 Levo- and Dextrorotary Enantiomers
;
_journal_issue                   45
_journal_name_full               'The Journal of Physical Chemistry C'
_journal_page_first              25503
_journal_paper_doi               10.1021/acs.jpcc.7b09170
_journal_volume                  121
_journal_year                    2017
_chemical_formula_moiety         'C28 H27 Br N2 O4'
_chemical_formula_sum            'C28 H27 Br N2 O4'
_chemical_formula_weight         535.42
_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'
_atom_sites_solution_hydrogens   geom
_audit_creation_date             2017-07-03
_audit_creation_method
;
Olex2 1.2-beta
(compiled 2017.06.29 svn.r3433 for OlexSys, GUI svn.r5356)
;
_cell_angle_alpha                90
_cell_angle_beta                 96.697(6)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   11.401(5)
_cell_length_b                   11.654(8)
_cell_length_c                   19.628(4)
_cell_measurement_reflns_used    1491
_cell_measurement_temperature    298.15
_cell_measurement_theta_max      18.715
_cell_measurement_theta_min      2.508
_cell_volume                     2590(2)
_computing_cell_refinement       'SAINT v7.68A (Bruker, 2009)'
_computing_data_reduction        'SAINT v7.68A (Bruker, 2009)'
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'ShelXL (Sheldrick, 2015)'
_diffrn_ambient_temperature      298.15
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.993
_diffrn_measurement_device_type  'Bruker P4'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0918
_diffrn_reflns_av_unetI/netI     0.1327
_diffrn_reflns_Laue_measured_fraction_full 0.996
_diffrn_reflns_Laue_measured_fraction_max 0.993
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            13856
_diffrn_reflns_point_group_measured_fraction_full 0.996
_diffrn_reflns_point_group_measured_fraction_max 0.993
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         25.997
_diffrn_reflns_theta_min         2.036
_exptl_absorpt_coefficient_mu    1.623
_exptl_absorpt_correction_T_max  0.7456
_exptl_absorpt_correction_T_min  0.5265
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
'SADABS-2008/1 (Bruker,2008) was used for absorption correction. wR2(int) was 0.0801 before and 0.0529 after correction. The Ratio of minimum to maximum transmission is 0.7061. The \l/2 correction factor is 0.0015.'
_exptl_crystal_colour            colourless
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.373
_exptl_crystal_description       block
_exptl_crystal_F_000             1104
_exptl_crystal_size_max          0.38
_exptl_crystal_size_mid          0.35
_exptl_crystal_size_min          0.3
_refine_diff_density_max         0.272
_refine_diff_density_min         -0.363
_refine_diff_density_rms         0.057
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.952
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     318
_refine_ls_number_reflns         5050
_refine_ls_number_restraints     600
_refine_ls_restrained_S_all      0.983
_refine_ls_R_factor_all          0.1773
_refine_ls_R_factor_gt           0.0573
_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^)+(0.0582P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1146
_refine_ls_wR_factor_ref         0.1549
_reflns_Friedel_coverage         0.000
_reflns_number_gt                2000
_reflns_number_total             5050
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            jp7b09170_si_007.cif
_cod_data_source_block           1
_cod_database_code               1554101
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_max   0.642
_shelx_estimated_absorpt_t_min   0.578
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All C(H,H) groups
 At 1.5 times of:
  All C(H,H,H) groups
2. Uiso/Uaniso restraints and constraints
C1 \\sim C2 \\sim C3 \\sim C4 \\sim C5 \\sim C6 \\sim C7 \\sim C8 \\sim C9
\\sim C10 \\sim C11 \\sim C12 \\sim C13 \\sim C14 \\sim C15 \\sim C16 \\sim C17
\\sim C18 \\sim C19 \\sim C20 \\sim C21 \\sim C22 \\sim C23 \\sim C24 \\sim C25
\\sim C26 \\sim C27 \\sim C28: within 3.8A with sigma of 0.01 and sigma for
terminal atoms of 0.02
3.a Ternary CH refined with riding coordinates:
 C7(H7)
3.b Secondary CH2 refined with riding coordinates:
 C20(H20A,H20B), C23(H23A,H23B), C27(H27A,H27B)
3.c Aromatic/amide H refined with riding coordinates:
 C1(H1), C2(H2), C3(H3), C5(H5), C6(H6), C9(H9), C10(H10), C12(H12), C13(H13),
 C15(H15), C16(H16), C17(H17), C18(H18), C19(H19)
3.d Idealised Me refined as rotating group:
 C24(H24A,H24B,H24C), C28(H28A,H28B,H28C)
;
_shelx_res_checksum              86106
_shelx_hkl_checksum              84939
_olex2_submission_special_instructions 'No special instructions were received'