Crystallographic characterisation of Ti(iv) piperazine complexes and their exploitation for the ring opening polymerisation of rac-lactide.
Hancock, Stuart L.; Mahon, Mary F.; Jones, Matthew D.; Dalton transactions (Cambridge, England : 2003) 40 (2011) 2033–2037; doi:10.1039/c0dt01542c

data_7015025
_publ_section_title
;
 Crystallographic characterisation of Ti(iv) piperazine complexes and
 their exploitation for the ring opening polymerisation of rac-lactide.
;
_journal_issue                   9
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              2033
_journal_page_last               2037
_journal_paper_doi               10.1039/c0dt01542c
_journal_volume                  40
_journal_year                    2011
_chemical_formula_sum            'C53 H96 N2 O8 Ti2'
_chemical_formula_weight         985.12
_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-97
_cell_angle_alpha                90.00
_cell_angle_beta                 91.5990(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   9.24600(10)
_cell_length_b                   24.3060(3)
_cell_length_c                   26.2840(3)
_cell_measurement_reflns_used    92915
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      25.03
_cell_measurement_theta_min      3.51
_cell_volume                     5904.59(12)
_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  0.0726
_diffrn_reflns_av_sigmaI/netI    0.0401
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       28
_diffrn_reflns_limit_k_min       -28
_diffrn_reflns_limit_l_max       31
_diffrn_reflns_limit_l_min       -31
_diffrn_reflns_number            67951
_diffrn_reflns_theta_full        24.99
_diffrn_reflns_theta_max         24.99
_diffrn_reflns_theta_min         3.53
_exptl_absorpt_coefficient_mu    0.318
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.108
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             2144
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.887
_refine_diff_density_min         -0.504
_refine_diff_density_rms         0.069
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.049
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     589
_refine_ls_number_reflns         10306
_refine_ls_number_restraints     123
_refine_ls_restrained_S_all      1.075
_refine_ls_R_factor_all          0.1055
_refine_ls_R_factor_gt           0.0851
_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^)+(0.1126P)^2^+10.5855P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2225
_refine_ls_wR_factor_ref         0.2403
_reflns_number_gt                8005
_reflns_number_total             10306
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            C0DT01542C.TXT
_cod_data_source_block           Ti2(6)(OiPr)6
_cod_original_sg_symbol_H-M      P21/n
_cod_database_code               7015025