Activationless Multiple-Site Concerted Proton-Electron Tunneling.
Bowring, Miriam A.; Bradshaw, Liam R.; Parada, Giovanny A.; Pollock, Timothy P.; Fernández-Terán, Ricardo J; Kolmar, Scott S.; Mercado, Brandon Q.; Schlenker, Cody W.; Gamelin, Daniel R.; Mayer, James M.; Journal of the American Chemical Society 140 (2018) 7449–7452; doi:10.1021/jacs.8b04455

data_4132506
_publ_section_title
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 Activationless Multiple-Site Concerted Proton-Electron Tunneling.
;
_journal_issue                   24
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              7449
_journal_page_last               7452
_journal_paper_doi               10.1021/jacs.8b04455
_journal_volume                  140
_journal_year                    2018
_chemical_absolute_configuration unk
_chemical_formula_moiety         'C26 H19 N O'
_chemical_formula_sum            'C26 H19 N O'
_chemical_formula_weight         361.42
_space_group_crystal_system      orthorhombic
_space_group_IT_number           29
_space_group_name_Hall           'P 2c -2ac'
_space_group_name_H-M_alt        'P c a 21'
_atom_sites_solution_hydrogens   mixed
_atom_sites_solution_primary     SHELXT
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-2014/7
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   17.7003(8)
_cell_length_b                   12.0897(6)
_cell_length_c                   8.2601(4)
_cell_measurement_reflns_used    8953
_cell_measurement_temperature    93(2)
_cell_measurement_theta_max      66.2740
_cell_measurement_theta_min      3.6270
_cell_volume                     1767.59(15)
_computing_cell_refinement       'CrysAlisPro 1.171.39.16b (Rigaku OD, 2015)'
_computing_data_collection       'CrysAlisPro 1.171.39.16b (Rigaku OD, 2015)'
_computing_data_reduction        'CrysAlisPro 1.171.39.16b (Rigaku OD, 2015)'
_computing_molecular_graphics
; 
Dolomanov, O.V.; Bourhis, L.J.; Gildea, R.J.; Howard, J.A.K.; Puschmann, H., 
OLEX2: A complete structure solution, refinement and analysis program 
(2009). J. Appl. Cryst., 42, 339-341.
;
_computing_publication_material  'CIFTAB-2014/2 (Sheldrick, 2014)'
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_computing_structure_solution    'SHELXT-2014/5 (Sheldrick, 2014)'
_diffrn_ambient_temperature      93(2)
_diffrn_detector_area_resol_mean 22.2
_diffrn_measured_fraction_theta_full 0.992
_diffrn_measured_fraction_theta_max 0.992
_diffrn_measurement_device_type  'Rigaku Saturn 944+ CCD'
_diffrn_measurement_method       \w
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.1761
_diffrn_reflns_av_unetI/netI     0.0535
_diffrn_reflns_Laue_measured_fraction_full 0.992
_diffrn_reflns_Laue_measured_fraction_max 0.992
_diffrn_reflns_limit_h_max       21
_diffrn_reflns_limit_h_min       -20
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       9
_diffrn_reflns_limit_l_min       -9
_diffrn_reflns_number            59401
_diffrn_reflns_point_group_measured_fraction_full 0.989
_diffrn_reflns_point_group_measured_fraction_max 0.989
_diffrn_reflns_theta_full        67.380
_diffrn_reflns_theta_max         67.380
_diffrn_reflns_theta_min         3.656
_diffrn_source                   'microfocus rotating anode'
_exptl_absorpt_coefficient_mu    0.640
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.40060
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
; 
The symmetry employed for this shelxl refinement is uniquely defined 
by the following loop, which should always be used as a source of 
symmetry information in preference to the above space-group names. 
They are only intended as comments. 
;
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.358
_exptl_crystal_description       Plate
_exptl_crystal_F_000             760
_exptl_crystal_size_max          0.040
_exptl_crystal_size_mid          0.040
_exptl_crystal_size_min          0.010
_refine_diff_density_max         0.218
_refine_diff_density_min         -0.234
_refine_diff_density_rms         0.050
_refine_ls_abs_structure_details
; 
 Flack x determined using 1002 quotients [(I+)-(I-)]/[(I+)+(I-)] 
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259). 
;
_refine_ls_abs_structure_Flack   0.1(5)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.157
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     257
_refine_ls_number_reflns         3153
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      1.157
_refine_ls_R_factor_all          0.0772
_refine_ls_R_factor_gt           0.0679
_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^)+(0.0732P)^2^+0.5042P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1546
_refine_ls_wR_factor_ref         0.1598
_reflns_Friedel_coverage         0.850
_reflns_Friedel_fraction_full    0.986
_reflns_Friedel_fraction_max     0.986
_reflns_number_gt                2806
_reflns_number_total             3153
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja8b04455_si_002.cif
_cod_data_source_block           007b-17020
_cod_database_code               4132506
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.975
_shelx_estimated_absorpt_t_max   0.994
_shelx_res_checksum              41136
_shelx_hkl_checksum              17197