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_7015023
_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            'C52 H96 N2 O8 Ti2'
_chemical_formula_weight         973.11
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                79.5090(10)
_cell_angle_beta                 84.6760(10)
_cell_angle_gamma                87.7970(10)
_cell_formula_units_Z            1
_cell_length_a                   9.4410(3)
_cell_length_b                   10.0110(3)
_cell_length_c                   15.1580(5)
_cell_measurement_reflns_used    16969
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      27.48
_cell_measurement_theta_min      3.51
_cell_volume                     1402.28(8)
_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 0.992
_diffrn_measured_fraction_theta_max 0.992
_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  0.0458
_diffrn_reflns_av_sigmaI/netI    0.0491
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            19702
_diffrn_reflns_theta_full        27.53
_diffrn_reflns_theta_max         27.53
_diffrn_reflns_theta_min         3.72
_exptl_absorpt_coefficient_mu    0.334
_exptl_absorpt_correction_T_max  0.9517
_exptl_absorpt_correction_T_min  0.9363
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Sortav (Blessing 1995)'
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.152
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             530
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.15
_refine_diff_density_max         1.352
_refine_diff_density_min         -0.653
_refine_diff_density_rms         0.072
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.025
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     350
_refine_ls_number_reflns         6423
_refine_ls_number_restraints     86
_refine_ls_restrained_S_all      1.077
_refine_ls_R_factor_all          0.0796
_refine_ls_R_factor_gt           0.0599
_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^)+(0.0821P)^2^+1.4868P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1525
_refine_ls_wR_factor_ref         0.1701
_reflns_number_gt                5071
_reflns_number_total             6423
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            C0DT01542C.TXT
_cod_data_source_block           Ti2(4)(OiPr)6
_cod_original_sg_symbol_H-M      P-1
_cod_database_code               7015023