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_7006121
_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_compound_source        'synthesis as described'
_chemical_formula_moiety         'C18 H24 O12'
_chemical_formula_sum            'C18 H24 O12'
_chemical_formula_weight         432.37
_chemical_name_common            'Chisholm 1498'
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      14
_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     direct
_atom_sites_solution_secondary   difmap
_audit_conform_dict_location     ftp://ftp.iucr.org/pub/cif_core.dic
_audit_conform_dict_name         cif_core.dic
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_audit_creation_date             2007-01-31T13:00:45-00:00
_audit_creation_method           'WinGX routine CIF_UPDATE'
_cell_angle_alpha                90
_cell_angle_beta                 93.048(5)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   8.4322(10)
_cell_length_b                   16.513(2)
_cell_length_c                   14.964(2)
_cell_measurement_reflns_used    4911
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      27.485
_cell_measurement_theta_min      2.037
_cell_measurement_wavelength     0.71073
_cell_volume                     2080.7(4)
_computing_cell_refinement       'HKL Scalepack (Otwinowski & Minor 1997)'
_computing_data_collection       'Collect (Nonius BV, 1997-2000)'
_computing_data_reduction
'HKL Denzo and Scalepack (Otwinowski & Minor 1997)'
_computing_molecular_graphics    'Ortep-3 for Windows (Farrugia, 1997)'
_computing_publication_material  'WinGX publication routines (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      150(2)
_diffrn_detector                 'CCD plate'
_diffrn_detector_area_resol_mean 9
_diffrn_measured_fraction_theta_full 1
_diffrn_measured_fraction_theta_max 1
_diffrn_measurement_device       '95mm CCD camera on \k-goniostat'
_diffrn_measurement_device_type  'Nonius KappaCCD'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_orient_matrix_type       'by Nonius Collect from scalepack cell'
_diffrn_orient_matrix_UB_11      -0.105626
_diffrn_orient_matrix_UB_12      -0.539368E-1
_diffrn_orient_matrix_UB_13      0.61782E-2
_diffrn_orient_matrix_UB_21      -0.76003E-2
_diffrn_orient_matrix_UB_22      0.80641E-2
_diffrn_orient_matrix_UB_23      -0.59537E-1
_diffrn_orient_matrix_UB_31      0.262092E-1
_diffrn_orient_matrix_UB_32      -0.604833E-1
_diffrn_orient_matrix_UB_33      -0.115381E-1
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.040
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       21
_diffrn_reflns_limit_k_min       -21
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            34054
_diffrn_reflns_theta_full        27.45
_diffrn_reflns_theta_max         27.45
_diffrn_reflns_theta_min         2.71
_diffrn_source                   'Enraf Nonius FR590'
_exptl_absorpt_coefficient_mu    0.118
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.38
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       'wedge-shaped fragment'
_exptl_crystal_F_000             912
_exptl_crystal_size_max          0.38
_exptl_crystal_size_mid          0.19
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.19
_refine_diff_density_min         -0.187
_refine_diff_density_rms         0.038
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.058
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     277
_refine_ls_number_reflns         4751
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.058
_refine_ls_R_factor_all          0.0573
_refine_ls_R_factor_gt           0.0347
_refine_ls_shift/su_max          0.003
_refine_ls_shift/su_mean         0
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0421P)^2^+0.2267P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0829
_refine_ls_wR_factor_ref         0.0905
_reflns_number_gt                3455
_reflns_number_total             4751
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b709081a.txt
_cod_data_source_block           Chisholm1498
_cod_original_sg_symbol_H-M      P21/n
_cod_database_code               7006121