Monomeric Ti(IV) Homopiperazine Complexes and their Exploitation for the Ring Opening Polymerisation of rac-Lactide
Stuart L Hancock; Mary F. Mahon; Matthew D. Jones; Chemistry Central Journal 7 (2013) 135–; doi:10.1186/1752-153X-7-135

data_1547246
_publ_section_title
;
 Monomeric Ti(IV) Homopiperazine Complexes and their Exploitation for the
 Ring Opening Polymerisation of rac-Lactide
;
_journal_name_full               'Chemistry Central Journal'
_journal_page_first              135
_journal_paper_doi               10.1186/1752-153X-7-135
_journal_volume                  7
_journal_year                    2013
_chemical_formula_sum            'C45 H76 N2 O4 Ti'
_chemical_formula_weight         756.95
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.9250(7)
_cell_length_b                   14.7200(12)
_cell_length_c                   27.1040(14)
_cell_measurement_reflns_used    80412
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      24.11
_cell_measurement_theta_min      3.51
_cell_volume                     4358.8(5)
_computing_cell_refinement       'HKL Scalepack (Otwinski & Minor, 1997)'
_computing_data_collection       'Collect (Nonius BV, 1997-2000)'
_computing_data_reduction        'HKL Denzo & Scalepack (Otwinski & 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
;
 SIR97- Altomare A., Burla M.C., Camalli M., Cascarano G.L., Giacovazzo C. ,
 Guagliardi A., Moliterni A.G.G., Polidori G.,Spagna R.
 (1999) J. Appl. Cryst. 32, 115-119.
;
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 0.994
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_device_type  'nonius kappa ccd'
_diffrn_measurement_method       ccd
_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  0.1339
_diffrn_reflns_av_sigmaI/netI    0.0668
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       31
_diffrn_reflns_limit_l_min       -31
_diffrn_reflns_number            52730
_diffrn_reflns_theta_full        24.10
_diffrn_reflns_theta_max         24.10
_diffrn_reflns_theta_min         3.66
_exptl_absorpt_coefficient_mu    0.238
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.153
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1656
_exptl_crystal_size_max          0.10
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.344
_refine_diff_density_min         -0.350
_refine_diff_density_rms         0.094
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.03(4)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.039
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     514
_refine_ls_number_reflns         6899
_refine_ls_number_restraints     4
_refine_ls_restrained_S_all      1.039
_refine_ls_R_factor_all          0.0918
_refine_ls_R_factor_gt           0.0607
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0957P)^2^+1.4331P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1452
_refine_ls_wR_factor_ref         0.1651
_reflns_number_gt                5257
_reflns_number_total             6899
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            13065_2013_669_MOESM3_ESM.cif
_cod_data_source_block           Ti(5)(OiPr)2
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' according to the built-in table from CIF Core
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 5376 2017-05-30 11:51:03Z andrius 
;
_cod_original_sg_symbol_H-M      P212121
_cod_database_code               1547246