Chiral transmission to crystal photodimerizations of leucine–methionine quasiracemic assemblies
Lu, Yuhua; Bolokowicz, Andrew. J.; Reeb, Sarah A.; Wiseman, Joshua D.; Wheeler, Kraig A.; RSC Advances 4 (2014) 8125–; doi:10.1039/c3ra47270a

data_7235319
_publ_section_title
;
 Chiral transmission to crystal photodimerizations of leucine--methionine
 quasiracemic assemblies
;
_journal_issue                   16
_journal_name_full               'RSC Advances'
_journal_page_first              8125
_journal_paper_doi               10.1039/c3ra47270a
_journal_volume                  4
_journal_year                    2014
_chemical_absolute_configuration rm
_chemical_formula_moiety         'C15 H19 N O6 S'
_chemical_formula_sum            'C15 H19 N O6 S'
_chemical_formula_weight         341.37
_space_group_crystal_system      monoclinic
_space_group_IT_number           4
_space_group_name_Hall           'P 2yb'
_space_group_name_H-M_alt        'P 1 21 1'
_atom_sites_solution_hydrogens   mixed
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 93.392(1)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   7.7603(1)
_cell_length_b                   6.9346(1)
_cell_length_c                   15.1225(1)
_cell_measurement_reflns_used    8135
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      71.557
_cell_measurement_theta_min      2.819
_cell_volume                     812.385(17)
_computing_cell_refinement       APEX2
_computing_data_reduction
;
SAINT (Bruker, 2009) and XPREP (Bruker, 2009)
;
_computing_molecular_graphics    'XSEED (Barbour, 2001)'
_computing_publication_material  'XSEED (Barbour, 2001)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector_area_resol_mean 8.33
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Bruker APEXII CCD'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0249
_diffrn_reflns_av_sigmaI/netI    0.0300
_diffrn_reflns_Laue_measured_fraction_full 0.998
_diffrn_reflns_Laue_measured_fraction_max 0.997
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            11646
_diffrn_reflns_point_group_measured_fraction_full 0.965
_diffrn_reflns_point_group_measured_fraction_max 0.962
_diffrn_reflns_theta_full        67.679
_diffrn_reflns_theta_max         68.212
_diffrn_reflns_theta_min         2.927
_exptl_absorpt_coefficient_mu    2.050
_exptl_absorpt_correction_T_max  0.8029
_exptl_absorpt_correction_T_min  0.4951
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Bruker, 2009)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.396
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       'transparent plate'
_exptl_crystal_F_000             360
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.33
_exptl_crystal_size_min          0.11
_refine_diff_density_max         0.234
_refine_diff_density_min         -0.269
_refine_diff_density_rms         0.044
_refine_ls_abs_structure_details
;
 Flack x determined using 1209 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons and Flack (2004), Acta Cryst. A60, s61).
;
_refine_ls_abs_structure_Flack   0.047(5)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.054
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     219
_refine_ls_number_reflns         2871
_refine_ls_number_restraints     4
_refine_ls_restrained_S_all      1.054
_refine_ls_R_factor_all          0.0249
_refine_ls_R_factor_gt           0.0245
_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^)+(0.0376P)^2^+0.1182P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0637
_refine_ls_wR_factor_ref         0.0641
_reflns_Friedel_coverage         0.773
_reflns_Friedel_fraction_full    0.926
_reflns_Friedel_fraction_max     0.921
_reflns_number_gt                2819
_reflns_number_total             2871
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c3ra47270a.cif
_cod_data_source_block           kaw95
_cod_original_sg_symbol_H-M      'P 21'
_cod_database_code               7235319
_shelxl_version_number           2013-4
_shelx_res_checksum              3810
_shelx_hkl_checksum              55870