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_1551153
_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         'C54 H68 B Mg N3 O2'
_chemical_formula_sum            'C54 H68 B Mg N3 O2'
_chemical_formula_weight         826.23
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2yn'
_space_group_name_H-M_alt        'P 1 21/n 1'
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     iterative
_audit_creation_date             2018-06-08
_audit_creation_method
;
Olex2 1.2
(compiled 2018.05.29 svn.r3508 for OlexSys, GUI svn.r5506)
;
_audit_update_record
;
2019-04-17 deposited with the CCDC.    2019-05-24 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 98.9416(9)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   12.10496(12)
_cell_length_b                   22.2539(2)
_cell_length_c                   18.11019(16)
_cell_measurement_reflns_used    19330
_cell_measurement_temperature    149.9(3)
_cell_measurement_theta_max      72.9010
_cell_measurement_theta_min      3.1650
_cell_volume                     4819.28(8)
_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      149.9(3)
_diffrn_detector                 'CCD plate'
_diffrn_detector_area_resol_mean 8.1150
_diffrn_detector_type            EosS2
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 0.995
_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  0.0657
_diffrn_reflns_av_unetI/netI     0.0449
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 0.995
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       26
_diffrn_reflns_limit_k_min       -27
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            60632
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 0.995
_diffrn_reflns_theta_full        67.684
_diffrn_reflns_theta_max         73.176
_diffrn_reflns_theta_min         3.170
_diffrn_source                   'micro-focus sealed X-ray tube'
_diffrn_source_type              'SuperNova (Cu) X-ray Source'
_exptl_absorpt_coefficient_mu    0.637
_exptl_absorpt_correction_T_max  0.989
_exptl_absorpt_correction_T_min  0.972
_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            colourless
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.139
_exptl_crystal_description       block
_exptl_crystal_F_000             1784
_exptl_crystal_size_max          0.217
_exptl_crystal_size_mid          0.192
_exptl_crystal_size_min          0.085
_refine_diff_density_max         0.243
_refine_diff_density_min         -0.233
_refine_diff_density_rms         0.041
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.025
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     587
_refine_ls_number_reflns         9606
_refine_ls_number_restraints     16
_refine_ls_restrained_S_all      1.084
_refine_ls_R_factor_all          0.0561
_refine_ls_R_factor_gt           0.0450
_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^)+(0.0487P)^2^+1.3591P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1076
_refine_ls_wR_factor_ref         0.1142
_reflns_Friedel_coverage         0.000
_reflns_number_gt                8042
_reflns_number_total             9606
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c9sc02087j2.cif
_cod_data_source_block           s18msh95-18Ph
_cod_database_code               1551153
_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. Restrained distances
 C12-C13 \\sim C12-C13A
 with sigma of 0.02
 C11-C12 \\sim C11-C12A
 with sigma of 0.02
 C12-C14 \\sim C12A-C14
 with sigma of 0.02
 C12-C13 \\sim C12A-C13
 with sigma of 0.02
 C12-C13A \\sim C12A-C13A
 with sigma of 0.02
 C14-C12A \\sim C14A-C12A
 with sigma of 0.02
 C14-C12 \\sim C14A-C12
 with sigma of 0.02
 C14-C12 \\sim C14A-C12A
 with sigma of 0.005
 C13-C12 \\sim C13A-C12A
 with sigma of 0.005
 C12-C11 \\sim C12A-C11
 with sigma of 0.005
3. Uiso/Uaniso restraints and constraints
Uanis(C12A) = Uanis(C12)
4. Others
 Fixed Sof: C12A(0.45) H12A(0.45) C13A(0.45) H13A(0.45) H13B(0.45) H13C(0.45)
 C14A(0.45) H14A(0.45) H14B(0.45) H14C(0.45) C12(0.55) H12(0.55) C13(0.55)
 H13D(0.55) H13E(0.55) H13F(0.55) C14(0.55) H14D(0.55) H14E(0.55) H14F(0.55)
5.a Ternary CH refined with riding coordinates:
 C15(H15), C24(H24), C27(H27), C12A(H12A), C12(H12)
5.b Aromatic/amide H refined with riding coordinates:
 C3(H3), C8(H8), C9(H9), C10(H10), C20(H20), C21(H21), C22(H22), C31(H31),
 C32(H32), C33(H33), C34(H34), C35(H35), C38(H38), C39(H39), C40(H40), C41(H41),
  C42(H42), C44(H44), C45(H45), C46(H46), C47(H47), C48(H48)
5.c Idealised Me refined as rotating group:
 C1(H1A,H1B,H1C), C5(H5A,H5B,H5C), C16(H16A,H16B,H16C), C17(H17A,H17B,H17C),
 C25(H25A,H25B,H25C), C26(H26A,H26B,H26C), C28(H28A,H28B,H28C), C29(H29A,H29B,
 H29C), C51(H51A,H51B,H51C), C52(H52A,H52B,H52C), C53(H53A,H53B,H53C), C54(H54A,
 H54B,H54C), C13A(H13A,H13B,H13C), C14A(H14A,H14B,H14C), C13(H13D,H13E,H13F),
 C14(H14D,H14E,H14F)
;