Aggregation-enhanced emissive mechanofluorochromic carbazole-halogen positional isomers: tunable fluorescence via conformational polymorphism and crystallization-induced fluorescence switching
Gayathri, Parthasarathy; Karthikeyan, Subramanian; Pannipara, Mehboobali; Al-Sehemi, Abdullah G.; Moon, Dohyun; Anthony, Savarimuthu Philip; CrystEngComm 21 (2019) 6604–; doi:10.1039/C9CE01227C

data_7234225
_publ_section_title
;
 Aggregation-enhanced emissive mechanofluorochromic carbazole-halogen
 positional isomers: tunable fluorescence via conformational polymorphism
 and crystallization-induced fluorescence switching
;
_journal_issue                   43
_journal_name_full               CrystEngComm
_journal_page_first              6604
_journal_paper_doi               10.1039/C9CE01227C
_journal_volume                  21
_journal_year                    2019
_chemical_formula_moiety         'C27 H17 Br N2'
_chemical_formula_sum            'C27 H17 Br N2'
_chemical_formula_weight         449.33
_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_method           SHELXL-2017/1
_audit_update_record
;
2019-08-03 deposited with the CCDC.    2019-09-26 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 96.70(3)
_cell_angle_gamma                90
_cell_formula_units_Z            4
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_cell_length_b                   13.595(3)
_cell_length_c                   16.421(3)
_cell_measurement_reflns_used    67696
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      33.679
_cell_measurement_theta_min      0.350
_cell_volume                     1989.0(7)
_computing_cell_refinement       '<i>HKL3000sm</i>(Otwinowski & Minor, 1997)'
_computing_data_collection
'<i>PAL BL2D-SMDC Program</i>(Shin et. al, 2016)'
_computing_data_reduction        '<i>HKL3000sm</i>(Otwinowski & Minor, 1997)'
_computing_molecular_graphics    '<i>DIAMOND 4</i>(Putz & Brandenburg, 2014)'
_computing_publication_material  '<i>enCifer 1.6</i>'
_computing_structure_refinement  '<i>SHELXL-2017</i> (Sheldrick, 2015)'
_computing_structure_solution    '<i>SHELXT-2014</i> (Sheldrick, 2015)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.982
_diffrn_measured_fraction_theta_max 0.972
_diffrn_measurement_device_type  'ADSC Q210 CCD area detector'
_diffrn_measurement_method       'omega scan'
_diffrn_radiation_type           synchrotron
_diffrn_radiation_wavelength     0.600
_diffrn_reflns_av_R_equivalents  0.0395
_diffrn_reflns_av_unetI/netI     0.0356
_diffrn_reflns_Laue_measured_fraction_full 0.982
_diffrn_reflns_Laue_measured_fraction_max 0.972
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            21085
_diffrn_reflns_point_group_measured_fraction_full 0.982
_diffrn_reflns_point_group_measured_fraction_max 0.972
_diffrn_reflns_theta_full        21.100
_diffrn_reflns_theta_max         25.000
_diffrn_reflns_theta_min         1.646
_diffrn_source                   'PLSII 2D bending magnet'
_exptl_absorpt_coefficient_mu    1.340
_exptl_absorpt_correction_T_max  1.000
_exptl_absorpt_correction_T_min  0.941
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details
'<i>HKL3000sm Scalepack(Otwinowski & Minor, 1997)</i>'
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.501
_exptl_crystal_description       block
_exptl_crystal_F_000             912
_exptl_crystal_size_max          0.133
_exptl_crystal_size_mid          0.118
_exptl_crystal_size_min          0.095
_refine_diff_density_max         0.450
_refine_diff_density_min         -0.938
_refine_diff_density_rms         0.083
_refine_ls_extinction_coef       0.0181(14)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL-2017/1 (Sheldrick 2017)'
_refine_ls_goodness_of_fit_ref   1.030
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     272
_refine_ls_number_reflns         5660
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.030
_refine_ls_R_factor_all          0.0451
_refine_ls_R_factor_gt           0.0344
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0610P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0908
_refine_ls_wR_factor_ref         0.0942
_reflns_Friedel_coverage         0.000
_reflns_number_gt                4593
_reflns_number_total             5660
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c9ce01227c2.cif
_cod_data_source_block           SPA209
_cod_depositor_comments
'Adding full bibliography for 7234221--7234231.cif.'
_cod_database_code               7234225
_shelx_shelxl_version_number     2017/1
_shelx_estimated_absorpt_t_min   0.842
_shelx_estimated_absorpt_t_max   0.883
_shelx_res_checksum              25476