Simple magnesium alkoxides: synthesis, molecular structure, and catalytic behaviour in the ring-opening polymerization of lactide and macrolactones and for copolymerization of maleic anhydride and propylene oxide
Wannipurage, Duleeka; D'Aniello, Sara; Pappalardo, Daniela; Kulathungage, Lakshani Wathsala; Ward, Cassandra L.; Anderson, Danni P.; Groysman, Stanislav; Mazzeo, Mina; Dalton Transactions  (2023) –; doi:10.1039/D3DT00785E

data_7713001
_publ_section_title
;
 Simple magnesium alkoxides: synthesis, molecular structure, and catalytic
 behaviour in the ring-opening polymerization of lactide and macrolactones
 and for copolymerization of maleic anhydride and propylene oxide
;
_journal_name_full               'Dalton Transactions'
_journal_paper_doi               10.1039/D3DT00785E
_journal_year                    2023
_chemical_formula_moiety         'C21 H30 O'
_chemical_formula_sum            'C21 H30 O'
_chemical_formula_weight         298.45
_space_group_crystal_system      orthorhombic
_space_group_IT_number           33
_space_group_name_Hall           'P 2c -2n'
_space_group_name_H-M_alt        'P n a 21'
_atom_sites_solution_hydrogens   mixed
_atom_sites_solution_primary     dual
_audit_creation_date             2022-04-12
_audit_creation_method
;
Olex2 1.5
(compiled 2021.12.09 svn.r5202d8cf for OlexSys, GUI svn.r6439)
;
_audit_update_record
;
2022-09-10 deposited with the CCDC.	2023-04-20 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   9.3463(5)
_cell_length_b                   13.8584(7)
_cell_length_c                   12.5331(6)
_cell_measurement_reflns_used    2697
_cell_measurement_temperature    100.10
_cell_measurement_theta_max      26.37
_cell_measurement_theta_min      2.19
_cell_volume                     1623.35(14)
_computing_molecular_graphics    'Olex2 1.5 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 1.5 (Dolomanov et al., 2009)'
_computing_structure_refinement  'SHELXL 2018/3 (Sheldrick, 2015)'
_computing_structure_solution    'SHELXT 2018/2 (Sheldrick, 2018)'
_diffrn_ambient_temperature      100.10
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device       '\k-geometry diffractometer'
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.1484
_diffrn_reflns_av_unetI/netI     0.0672
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 0.999
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            25270
_diffrn_reflns_point_group_measured_fraction_full 0.979
_diffrn_reflns_point_group_measured_fraction_max 0.961
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         26.371
_diffrn_reflns_theta_min         2.191
_exptl_absorpt_coefficient_mu    0.072
_exptl_absorpt_correction_T_max  0.9914
_exptl_absorpt_correction_T_min  0.9893
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS 2016/2: Krause, L., Herbst-Irmer, R., Sheldrick G.M. & Stalke D.,
 J. Appl. Cryst. 48 (2015) 3-10
;
_exptl_crystal_colour            colourless
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.221
_exptl_crystal_description       block
_exptl_crystal_F_000             656
_exptl_crystal_size_max          0.15
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.12
_refine_diff_density_max         0.189
_refine_diff_density_min         -0.227
_refine_diff_density_rms         0.051
_refine_ls_abs_structure_details
;
 Flack x determined using 971 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.5(10)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.059
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     205
_refine_ls_number_reflns         3189
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.059
_refine_ls_R_factor_all          0.0728
_refine_ls_R_factor_gt           0.0604
_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^)+(0.0313P)^2^+0.6614P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0933
_refine_ls_wR_factor_ref         0.0976
_reflns_Friedel_coverage         0.837
_reflns_Friedel_fraction_full    0.956
_reflns_Friedel_fraction_max     0.919
_reflns_number_gt                2697
_reflns_number_total             3189
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d3dt00785e2.cif
_cod_data_source_block           sg799
_cod_database_code               7713001
_shelx_shelxl_version_number     2018/3
_shelx_estimated_absorpt_t_max   0.991
_shelx_estimated_absorpt_t_min   0.989
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All C(H,H) groups, All O(H) groups
 At 1.5 times of:
  All C(H,H,H) groups
2.a Ternary CH refined with riding coordinates:
 C8(H8), C11(H11), C13(H13)
2.b Secondary CH2 refined with riding coordinates:
 C21(H21A,H21B), C9(H9A,H9B), C7(H7A,H7B), C10(H10A,H10B), C14(H14A,H14B),
 C12(H12A,H12B)
2.c Aromatic/amide H refined with riding coordinates:
 C3(H3), C1(H1A), C16(H16), C2(H2), C15(H15)
2.d Idealised Me refined as rotating group:
 C19(H19A,H19B,H19C), C20(H20A,H20B,H20C), C18(H18A,H18B,H18C)
;
_shelx_res_checksum              2666
_olex2_submission_special_instructions 'No special instructions were received'