Stereocontrolled lactide polymerisation determined by the nuclearity of the yttrium initiator.
Platel, Rachel H; White, Andrew J P; Williams, Charlotte K; Chemical communications (Cambridge, England) 34 (2009) 4115–4117; doi:10.1039/b903784e

data_7104594
_publ_section_title
;
 Stereocontrolled lactide polymerisation determined by the nuclearity
 of the yttrium initiator.
;
_journal_issue                   27
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              4115
_journal_page_last               4117
_journal_paper_doi               10.1039/b903784e
_journal_volume                  34
_journal_year                    2009
_chemical_formula_moiety         'C25 H60 N3 O2 P2 Si2 Y'
_chemical_formula_sum            'C25 H60 N3 O2 P2 Si2 Y'
_chemical_formula_weight         641.79
_space_group_IT_number           9
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'C -2yc'
_symmetry_space_group_name_H-M   'C 1 c 1'
_atom_sites_solution_hydrogens   geom
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_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 104.350(4)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   12.7563(4)
_cell_length_b                   18.5514(6)
_cell_length_c                   15.1861(6)
_cell_measurement_reflns_used    6359
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      32.3262
_cell_measurement_theta_min      3.6754
_cell_volume                     3481.6(2)
_computing_cell_refinement       'CrysAlis RED, Oxford Diffraction Ltd'
_computing_data_collection       'CrysAlis CCD, Oxford Diffraction Ltd'
_computing_data_reduction        'CrysAlis RED, Oxford Diffraction Ltd'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_detector_area_resol_mean 15.9863
_diffrn_measured_fraction_theta_full 0.989
_diffrn_measured_fraction_theta_max 0.911
_diffrn_measurement_device_type  'OD Xcalibur 3'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'Enhance (Mo) X-ray Source'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0435
_diffrn_reflns_av_sigmaI/netI    0.0792
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -19
_diffrn_reflns_limit_k_max       26
_diffrn_reflns_limit_k_min       -22
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            14319
_diffrn_reflns_theta_full        30.50
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_diffrn_reflns_theta_min         3.68
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    1.860
_exptl_absorpt_correction_T_max  0.895
_exptl_absorpt_correction_T_min  0.745
_exptl_absorpt_correction_type   analytical
_exptl_absorpt_process_details
;
CrysAlis RED, Oxford Diffraction Ltd.,
Version 1.171.33.31 (release 08-01-2009 CrysAlis171 .NET)
(compiled Jan 8 2009,16:24:04)
Analytical numeric absorption correction using a multifaceted crystal
model based on expressions derived by R.C. Clark & J.S. Reid.
(Clark, R. C. & Reid, J. S. (1995). Acta Cryst. A51, 887-897)
;
_exptl_crystal_colour            Colourless
_exptl_crystal_density_diffrn    1.224
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       blocks
_exptl_crystal_F_000             1376
_exptl_crystal_size_max          0.17
_exptl_crystal_size_mid          0.16
_exptl_crystal_size_min          0.04
_refine_diff_density_max         1.069
_refine_diff_density_min         -0.409
_refine_diff_density_rms         0.072
_refine_ls_abs_structure_details
'Flack H D (1983), Acta Cryst. A39, 876-881, 1542 Friedel pairs'
_refine_ls_abs_structure_Flack   -0.005(3)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.900
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     316
_refine_ls_number_reflns         7236
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      0.900
_refine_ls_R_factor_all          0.0513
_refine_ls_R_factor_gt           0.0353
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0342P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0693
_refine_ls_wR_factor_ref         0.0712
_reflns_number_gt                5391
_reflns_number_total             7236
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b903784e.txt
_cod_data_source_block           Compound_1
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 
;
_cod_original_sg_symbol_H-M      Cc
_cod_database_code               7104594