UV degradation of poly(lactic acid) materials through copolymerisation with a sugar-derived cyclic xanthate
Hardy, Craig A.; Kociok-Köhn, Gabriele; Buchard, Antoine; Chemical Communications  (2022) –; doi:10.1039/D2CC01322C

data_7129933
_publ_section_title
;
 UV degradation of poly(lactic acid) materials through copolymerisation
 with a sugar-derived cyclic xanthate
;
_journal_name_full               'Chemical Communications'
_journal_paper_doi               10.1039/D2CC01322C
_journal_year                    2022
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C7 H8 O2 S2'
_chemical_formula_sum            'C7 H8 O2 S2'
_chemical_formula_weight         188.25
_space_group_crystal_system      orthorhombic
_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     dual
_audit_creation_method           SHELXL-2018/3
_audit_update_record
;
2021-06-10 deposited with the CCDC.	2022-04-06 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   6.2400(3)
_cell_length_b                   7.3164(4)
_cell_length_c                   17.7083(8)
_cell_measurement_reflns_used    3575
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      29.8990
_cell_measurement_theta_min      4.2770
_cell_volume                     808.46(7)
_computing_cell_refinement       'CrysAlisPro 1.171.40.67a (Rigaku OD, 2019)'
_computing_data_collection       'CrysAlisPro 1.171.40.67a (Rigaku OD, 2019)'
_computing_data_reduction        'CrysAlisPro 1.171.40.67a (Rigaku OD, 2019)'
_computing_molecular_graphics
'ORTEP3 for Windows - Farrugia, L. J. J. Appl. Crystallogr. 1997, 30, 565'
_computing_publication_material
;
 'WinGX publication routines, Farrugia, 
 L. J., J. Appl. Crystallogr., 1999, 32, 837-838
;
_computing_structure_refinement
;
 SHELXL-2018/3 (Sheldrick, 2018)
 Sheldrick GM (2008) Acta Crystallogr A64:112--122 and 
 C. B. H\"ubschle, G. M. Sheldrick and B. Dittrich
 ShelXle: a Qt graphical user interface for SHELXL
 J. Appl. Cryst., 44, (2011) 1281-1284.
;
_computing_structure_solution    'SHELXT 2014/5 (Sheldrick, 2014)'
_diffrn_ambient_environment      N~2~
_diffrn_ambient_temperature      150.00(10)
_diffrn_detector                 'CCD plate'
_diffrn_detector_area_resol_mean 8.0734
_diffrn_detector_type            EosS2
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.939
_diffrn_measurement_device       'four-circle diffractometer'
_diffrn_measurement_device_type  'New Xcalibur, EosS2'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0277
_diffrn_reflns_av_unetI/netI     0.0326
_diffrn_reflns_Laue_measured_fraction_full 0.998
_diffrn_reflns_Laue_measured_fraction_max 0.939
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            7475
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.902
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         30.268
_diffrn_reflns_theta_min         3.462
_diffrn_source                   'fine-focus sealed X-ray tube'
_diffrn_source_type              'Enhance (Mo) X-ray Source'
_exptl_absorpt_coefficient_mu    0.601
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.90790
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro 1.171.40.67a (Rigaku Oxford Diffraction, 2019)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.547
_exptl_crystal_description       block
_exptl_crystal_F_000             392
_exptl_crystal_size_max          0.429
_exptl_crystal_size_mid          0.327
_exptl_crystal_size_min          0.101
_refine_diff_density_max         0.388
_refine_diff_density_min         -0.337
_refine_diff_density_rms         0.061
_refine_ls_abs_structure_details
;
 Flack x determined using 698 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   -0.02(5)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.094
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     100
_refine_ls_number_reflns         2183
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.094
_refine_ls_R_factor_all          0.0382
_refine_ls_R_factor_gt           0.0328
_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^)+(0.0316P)^2^+0.0654P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0673
_refine_ls_wR_factor_ref         0.0692
_reflns_Friedel_coverage         0.632
_reflns_Friedel_fraction_full    1.000
_reflns_Friedel_fraction_max     0.848
_reflns_number_gt                1985
_reflns_number_total             2183
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d2cc01322c2.cif
_cod_data_source_block           e20ab1
_cod_database_code               7129933
_shelx_shelxl_version_number     2018/3
_shelx_estimated_absorpt_t_min   0.783
_shelx_estimated_absorpt_t_max   0.942
_oxdiff_exptl_absorpt_empirical_full_min 0.901
_oxdiff_exptl_absorpt_empirical_full_max 1.125
_oxdiff_exptl_absorpt_empirical_details
;
Empirical correction (ABSPACK) includes:
- Absorption correction using spherical harmonics
- Frame scaling
;
_shelx_res_checksum              6752