18-membered cyclic esters derived from glycolide and lactide: preparations, structures and coordination to sodium ions.
Chisholm, Malcolm H.; Gallucci, Judith C.; Yin, Hongfeng; Dalton transactions (Cambridge, England : 2003)  (2007) 4811–4821; doi:10.1039/b709081a

data_7006120
_publ_section_title
;
 18-membered cyclic esters derived from glycolide and lactide:
 preparations, structures and coordination to sodium ions.
;
_journal_issue                   42
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              4811
_journal_page_last               4821
_journal_paper_doi               10.1039/b709081a
_journal_year                    2007
_chemical_formula_moiety         'C25 H25 B N2'
_chemical_formula_sum            'C25 H25 B N2'
_chemical_formula_weight         364.28
_space_group_IT_number           61
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2ab'
_symmetry_space_group_name_H-M   'P b c a'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   15.2297(11)
_cell_length_b                   11.7129(8)
_cell_length_c                   22.5154(18)
_cell_measurement_temperature    95(2)
_cell_volume                     4016.4(5)
_computing_data_reduction        'SAINT, Bruker AXS, 2003'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      95(2)
_diffrn_detector                 'CCD area detector'
_diffrn_detector_type            'Bruker SMART 6000'
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device       'three-circle goniometer with fixed chi'
_diffrn_measurement_device_type  'Bruker Platform goniometer'
_diffrn_measurement_method       'omega and phi scans'
_diffrn_radiation_monochromator  'diamond 1 1 1'
_diffrn_radiation_source         synchrotron
_diffrn_radiation_type           synchrotron
_diffrn_radiation_wavelength     0.49594
_diffrn_reflns_av_R_equivalents  0.0545
_diffrn_reflns_limit_h_max       18
_diffrn_reflns_limit_h_min       -18
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_limit_l_min       -27
_diffrn_reflns_number            48843
_diffrn_reflns_theta_full        17.51
_diffrn_reflns_theta_max         17.51
_diffrn_reflns_theta_min         1.26
_exptl_absorpt_coefficient_mu    0.015
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.205
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             1552
_exptl_crystal_size_max          0.08
_exptl_crystal_size_mid          0.08
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.321
_refine_diff_density_min         -0.222
_refine_diff_density_rms         0.046
_refine_ls_extinction_coef       0.0060(8)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.072
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     256
_refine_ls_number_reflns         3750
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.072
_refine_ls_R_factor_all          0.0533
_refine_ls_R_factor_gt           0.0442
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0479P)^2^+2.6670P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1085
_refine_ls_wR_factor_ref         0.1131
_reflns_number_gt                3200
_reflns_number_total             3750
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b709081a.txt
_cod_data_source_block           Chisholm_CMC0438
_cod_original_sg_symbol_H-M      Pbca
_cod_database_code               7006120