A well defined tin(ii) initiator for the living polymerisation of lactide
Dove, Andrew P.; Gibson, Vernon C.; Marshall, Edward L.; White, Andrew J. P.; Williams, David J.; Chemical Communications  (2001) 283–; doi:10.1039/b008770j

data_7114882
_publ_section_title
;
 A well defined tin(ii) initiator for the living polymerisation of lactide
;
_journal_issue                   3
_journal_name_full               'Chemical Communications'
_journal_page_first              283
_journal_paper_doi               10.1039/b008770j
_journal_year                    2001
_chemical_formula_sum            'C32 H48 N2 O Sn'
_chemical_formula_weight         595.41
_chemical_name_systematic
; 
? 
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_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_creation_method           SHELXL
_cell_angle_alpha                90.00
_cell_angle_beta                 107.424(13)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   13.2052(15)
_cell_length_b                   16.680(2)
_cell_length_c                   15.5267(15)
_cell_measurement_reflns_used    20
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      12.54
_cell_measurement_theta_min      5.06
_cell_volume                     3263.0(7)
_computing_cell_refinement       'Siemens XSCANS'
_computing_data_collection       'Siemens XSCANS'
_computing_data_reduction        'Siemens SHELXTL'
_computing_molecular_graphics    'Siemens SHELXTL'
_computing_publication_material  'Siemens SHELXTL'
_computing_structure_refinement  'SHELXL-93 (Sheldrick, 1993)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measurement_device       'Siemens P4'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0740
_diffrn_reflns_av_sigmaI/netI    0.0631
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -18
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_diffrn_reflns_theta_min         1.78
_diffrn_standards_decay_%        25.48
_diffrn_standards_interval_count 97
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.807
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            Yellow
_exptl_crystal_density_diffrn    1.212
_exptl_crystal_description       blocks
_exptl_crystal_F_000             1248
_exptl_crystal_size_max          1.00
_exptl_crystal_size_mid          0.83
_exptl_crystal_size_min          0.67
_refine_diff_density_max         0.672
_refine_diff_density_min         -0.583
_refine_diff_density_rms         0.071
_refine_ls_extinction_coef       0.0017(4)
_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_all   1.022
_refine_ls_goodness_of_fit_obs   1.089
_refine_ls_matrix_type           full
_refine_ls_number_parameters     326
_refine_ls_number_reflns         5242
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.051
_refine_ls_restrained_S_obs      1.089
_refine_ls_R_factor_all          0.0804
_refine_ls_R_factor_obs          0.0491
_refine_ls_shift/esd_max         0.001
_refine_ls_shift/esd_mean        0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0622P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.1303
_refine_ls_wR_factor_obs         0.1122
_reflns_number_observed          4038
_reflns_number_total             5742
_reflns_observed_criterion       >2sigma(I)
_cod_data_source_file            b008770j.txt
_cod_data_source_block           VG0032
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to
/usr/data/users/saulius/automatic-downloads/retrospective/RSC/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 2281 2013-09-26 08:29:07Z andrius 

The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.0622P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3' was
changed to 'calc'. New tag '_refine_ls_weighting_details' was
created. The value of the new tag was set to
'w=1/[\s^2^(Fo^2^)+(0.0622P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_original_cell_volume        3263.1(6)
_cod_original_sg_symbol_H-M      P2(1)/n
_cod_database_code               7114882