Tert-butylamidinate tin(ii) complexes: high activity, single-site initiators for the controlled production of polylactide.
Nimitsiriwat, Nonsee; Gibson, Vernon C.; Marshall, Edward L.; White, Andrew J. P.; Dale, Sophie H.; Elsegood, Mark R. J.; Dalton transactions (Cambridge, England : 2003)  (2007) 4464–4471; doi:10.1039/b706663e

data_7005893
_publ_section_title
;
 Tert-butylamidinate tin(ii) complexes: high activity, single-site
 initiators for the controlled production of polylactide.
;
_journal_issue                   39
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              4464
_journal_page_last               4471
_journal_paper_doi               10.1039/b706663e
_journal_year                    2007
_chemical_formula_moiety         'C32 H50 N2 O Sn'
_chemical_formula_sum            'C32 H50 N2 O Sn'
_chemical_formula_weight         597.43
_chemical_name_systematic
;
?
;
_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                   18.3898(5)
_cell_length_b                   17.9716(4)
_cell_length_c                   19.1257(5)
_cell_measurement_reflns_used    27448
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      28.84
_cell_measurement_theta_min      2.22
_cell_volume                     6320.9(3)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL and local programs'
_computing_structure_refinement  'Bruker SHELXTL'
_computing_structure_solution    'Bruker SHELXTL'
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 0.931
_diffrn_measurement_device_type  'Bruker SMART 1000 CCD diffractometer'
_diffrn_measurement_method       '\w rotation with narrow frames'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0199
_diffrn_reflns_av_sigmaI/netI    0.0136
_diffrn_reflns_limit_h_max       24
_diffrn_reflns_limit_h_min       -24
_diffrn_reflns_limit_k_max       24
_diffrn_reflns_limit_k_min       -24
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            53703
_diffrn_reflns_theta_full        26.00
_diffrn_reflns_theta_max         29.08
_diffrn_reflns_theta_min         1.91
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.833
_exptl_absorpt_correction_T_max  0.892
_exptl_absorpt_correction_T_min  0.691
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS, v2.03 (Sheldrick, 2001)'
_exptl_crystal_colour            Colourless
_exptl_crystal_density_diffrn    1.256
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Block
_exptl_crystal_F_000             2512
_exptl_crystal_size_max          0.48
_exptl_crystal_size_mid          0.46
_exptl_crystal_size_min          0.14
_refine_diff_density_max         0.755
_refine_diff_density_min         -0.325
_refine_diff_density_rms         0.064
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.092
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     338
_refine_ls_number_reflns         7878
_refine_ls_number_restraints     99
_refine_ls_restrained_S_all      1.088
_refine_ls_R_factor_all          0.0380
_refine_ls_R_factor_gt           0.0249
_refine_ls_shift/su_max          0.004
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0214P)^2^+6.6377P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0562
_refine_ls_wR_factor_ref         0.0656
_reflns_number_gt                6329
_reflns_number_total             7878
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            b706663e.txt
_cod_data_source_block           3
_cod_original_sg_symbol_H-M      Pbca
_cod_database_code               7005893