Coumarin-Annelated Regioisomeric Heptahelicenes: Influence of Helicity on Excited-State Properties and Chiroptical Properties.
Mukhopadhyay, Arindam; Jana, Kanyashree; Hossen, Tousif; Sahu, Kalyanasis; Moorthy, Jarugu Narasimha; The Journal of organic chemistry 84 (2019) 10658–10668; doi:10.1021/acs.joc.9b01126

data_4033874
_publ_section_title
;
 Coumarin-Annelated Regioisomeric Heptahelicenes: Influence of Helicity on
 Excited-State Properties and Chiroptical Properties.
;
_journal_issue                   17
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              10658
_journal_page_last               10668
_journal_paper_doi               10.1021/acs.joc.9b01126
_journal_volume                  84
_journal_year                    2019
_chemical_formula_sum            'C31 H16 F3 O4'
_chemical_formula_weight         509.44
_space_group_crystal_system      monoclinic
_space_group_IT_number           9
_space_group_name_Hall           'C -2yc'
_space_group_name_H-M_alt        'C 1 c 1'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2017/1
_cell_angle_alpha                90
_cell_angle_beta                 107.9150(10)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   12.3004(5)
_cell_length_b                   26.5371(11)
_cell_length_c                   7.3874(3)
_cell_measurement_reflns_used    4866
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      28.349
_cell_measurement_theta_min      2.886
_cell_volume                     2294.45(16)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_structure_refinement  'SHELXL-2017/1 (Sheldrick, 2017)'
_computing_structure_solution    'SHELXT 2014/5 (Sheldrick, 2014)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0377
_diffrn_reflns_av_unetI/netI     0.0472
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.999
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       35
_diffrn_reflns_limit_k_min       -35
_diffrn_reflns_limit_l_max       9
_diffrn_reflns_limit_l_min       -9
_diffrn_reflns_number            17462
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.997
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         28.349
_diffrn_reflns_theta_min         2.886
_diffrn_source                   'sealed tube'
_exptl_absorpt_coefficient_mu    0.113
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.475
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1044
_exptl_crystal_size_max          0.24
_exptl_crystal_size_mid          0.18
_exptl_crystal_size_min          0.12
_refine_diff_density_max         0.383
_refine_diff_density_min         -0.366
_refine_diff_density_rms         0.059
_refine_ls_abs_structure_details
;
 Flack x determined using 2049 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.4(3)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.044
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     343
_refine_ls_number_reflns         5724
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      1.044
_refine_ls_R_factor_all          0.0635
_refine_ls_R_factor_gt           0.0497
_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^)+(0.0510P)^2^+1.7480P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1086
_refine_ls_wR_factor_ref         0.1146
_reflns_Friedel_coverage         0.990
_reflns_Friedel_fraction_full    0.998
_reflns_Friedel_fraction_max     0.995
_reflns_number_gt                4866
_reflns_number_total             5724
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            jo9b01126_si_002.cif
_cod_data_source_block           7-in
_cod_original_sg_symbol_H-M      'C c'
_cod_database_code               4033874
_shelx_shelxl_version_number     2017/1
_shelx_res_checksum              93519
_shelx_hkl_checksum              6202