New facets of an old ligand: titanium and zirconium complexes of phenylenediamine bis(phenolate) in lactide polymerisation catalysis.
Zelikoff, Ayellet L; Kopilov, Jacob; Goldberg, Israel; Coates, Geoffrey W; Kol, Moshe; Chemical communications (Cambridge, England)  (2009) 6804–6806; doi:10.1039/b915211c

data_7105029
_publ_section_title
;
 New facets of an old ligand: titanium and zirconium complexes of
 phenylenediamine bis(phenolate) in lactide polymerisation catalysis.
;
_journal_issue                   44
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              6804
_journal_page_last               6806
_journal_paper_doi               10.1039/b915211c
_journal_year                    2009
_chemical_formula_moiety         'C52 H88 N2 O8 Zr2, C5 H12'
_chemical_formula_sum            'C57 H100 N2 O8 Zr2'
_chemical_formula_weight         1123.83
_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                66.3144(16)
_cell_angle_beta                 80.8334(10)
_cell_angle_gamma                81.8588(11)
_cell_formula_units_Z            2
_cell_length_a                   14.4907(4)
_cell_length_b                   15.2879(3)
_cell_length_c                   15.5942(4)
_cell_measurement_reflns_used    10865
_cell_measurement_temperature    110(2)
_cell_measurement_theta_max      25.98
_cell_measurement_theta_min      1.41
_cell_volume                     3111.68(13)
_computing_cell_refinement       Denzo
_computing_data_collection       'Collect, Nonius B.V.'
_computing_data_reduction        'Denzo & Scalepack'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    SIR-97
_diffrn_ambient_temperature      110(2)
_diffrn_detector_area_resol_mean 12.8
_diffrn_measured_fraction_theta_full 0.982
_diffrn_measured_fraction_theta_max 0.982
_diffrn_measurement_device_type  'Nonius KappaCCD'
_diffrn_measurement_method       '1 deg. \f and \w scans'
_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  0.0510
_diffrn_reflns_av_sigmaI/netI    0.0639
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -18
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            27999
_diffrn_reflns_theta_full        25.98
_diffrn_reflns_theta_max         25.98
_diffrn_reflns_theta_min         2.41
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.383
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.199
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plates
_exptl_crystal_F_000             1200
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.10
_refine_diff_density_max         1.151
_refine_diff_density_min         -0.759
_refine_diff_density_rms         0.087
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.040
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     623
_refine_ls_number_reflns         11977
_refine_ls_number_restraints     4
_refine_ls_restrained_S_all      1.040
_refine_ls_R_factor_all          0.0845
_refine_ls_R_factor_gt           0.0549
_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^)+(0.0755P)^2^+2.9877P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1333
_refine_ls_wR_factor_ref         0.1513
_reflns_number_gt                8576
_reflns_number_total             11977
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b915211c.txt
_cod_data_source_block           mk200
_cod_database_code               7105029