Snapshots of Magnesium-Centred Diborane Heterolysis by an Outer Sphere SN2 Process
Pecharman, Anne-Frederique; Hill, Michael; McMullon, Grace; McMullin, Claire; Mahon, Mary F.; Chemical Science  (2019) –; doi:10.1039/C9SC02087J

data_1551155
_publ_section_title
;
 Snapshots of Magnesium-Centred Diborane Heterolysis by an Outer Sphere
 SN2 Process
;
_journal_name_full               'Chemical Science'
_journal_paper_doi               10.1039/C9SC02087J
_journal_year                    2019
_chemical_formula_moiety         'C48 H64 B Mg N3 O2'
_chemical_formula_sum            'C48 H64 B Mg N3 O2'
_chemical_formula_weight         750.14
_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
_atom_sites_solution_primary     iterative
_audit_creation_date             2017-02-08
_audit_creation_method
;
Olex2 1.2
(compiled 2017.01.04 svn.r3372 for OlexSys, GUI svn.r5292)
;
_audit_update_record
;
2019-04-17 deposited with the CCDC.    2019-05-24 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90.243(4)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   11.8747(5)
_cell_length_b                   20.2674(6)
_cell_length_c                   18.1008(7)
_cell_measurement_reflns_used    8842
_cell_measurement_temperature    150.00(10)
_cell_measurement_theta_max      73.1440
_cell_measurement_theta_min      3.2530
_cell_volume                     4356.3(3)
_computing_cell_refinement       'CrysAlisPro 1.171.38.41 (Rigaku OD, 2015)'
_computing_data_collection       'CrysAlisPro 1.171.38.41 (Rigaku OD, 2015)'
_computing_data_reduction        'CrysAlisPro 1.171.38.41 (Rigaku OD, 2015)'
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'ShelXL (Sheldrick, 2015)'
_computing_structure_solution    'olex2.solve (Bourhis et al., 2015)'
_diffrn_ambient_environment      N~2~
_diffrn_ambient_temperature      150.00(10)
_diffrn_detector                 'CCD plate'
_diffrn_detector_area_resol_mean 8.1150
_diffrn_detector_type            EosS2
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.990
_diffrn_measurement_device       'four-circle diffractometer'
_diffrn_measurement_device_type  'SuperNova, Dual, Cu at zero, EosS2'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  mirror
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.1131
_diffrn_reflns_av_unetI/netI     0.0694
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.990
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       25
_diffrn_reflns_limit_k_min       -21
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            54653
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.990
_diffrn_reflns_theta_full        67.684
_diffrn_reflns_theta_max         73.848
_diffrn_reflns_theta_min         3.274
_diffrn_source                   'micro-focus sealed X-ray tube'
_diffrn_source_type              'SuperNova (Cu) X-ray Source'
_exptl_absorpt_coefficient_mu    0.655
_exptl_absorpt_correction_T_max  0.988
_exptl_absorpt_correction_T_min  0.978
_exptl_absorpt_correction_type   gaussian
_exptl_absorpt_process_details
;
CrysAlisPro 1.171.38.41 (Rigaku Oxford Diffraction, 2015)
Numerical absorption correction based on gaussian integration over
            a multifaceted crystal model
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.144
_exptl_crystal_description       block
_exptl_crystal_F_000             1624
_exptl_crystal_size_max          0.149
_exptl_crystal_size_mid          0.124
_exptl_crystal_size_min          0.078
_refine_diff_density_max         0.364
_refine_diff_density_min         -0.374
_refine_diff_density_rms         0.051
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.056
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     510
_refine_ls_number_reflns         8726
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.056
_refine_ls_R_factor_all          0.0919
_refine_ls_R_factor_gt           0.0675
_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^)+(0.0567P)^2^+2.4447P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1491
_refine_ls_wR_factor_ref         0.1620
_reflns_Friedel_coverage         0.000
_reflns_number_gt                6660
_reflns_number_total             8726
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c9sc02087j2.cif
_cod_data_source_block           s17msh18-17BC
_cod_database_code               1551155
_shelx_shelxl_version_number     2014/7
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups
 At 1.5 times of:
  All C(H,H,H) groups
2.a Ternary CH refined with riding coordinates:
 C12(H12), C15(H15), C24(H24), C27(H27), C36(H36)
2.b Aromatic/amide H refined with riding coordinates:
 C3(H3), C8(H8), C9(H9), C10(H10), C20(H20), C21(H21), C22(H22), C38(H38),
 C39(H39), C40(H40), C41(H41), C42(H42), C44(H44), C45(H45), C46(H46), C47(H47),
  C48(H48)
2.c Idealised Me refined as rotating group:
 C1(H1A,H1B,H1C), C5(H5A,H5B,H5C), C7(H7A,H7B,H7C), C13(H13A,H13B,H13C),
 C16(H16A,H16B,H16C), C17(H17A,H17B,H17C), C25(H25A,H25B,H25C), C26(H26A,H26B,
 H26C), C28(H28A,H28B,H28C), C29(H29A,H29B,H29C), C32(H32A,H32B,H32C), C33(H33A,
 H33B,H33C), C34(H34A,H34B,H34C), C35(H35A,H35B,H35C)
;