Group iv complexes containing the benzotriazole phenoxide ligand as catalysts for the ring-opening polymerization of lactides, epoxides and as precatalysts for the polymerization of ethylene.
Pappuru, Sreenath; Chokkapu, Eswara Rao; Chakraborty, Debashis; Ramkumar, Venkatachalam; Dalton transactions (Cambridge, England : 2003) 42 (2013) 16412–16427; doi:10.1039/c3dt52065j

data_7023952
_publ_section_title
;
 Group iv complexes containing the benzotriazole phenoxide ligand as
 catalysts for the ring-opening polymerization of lactides, epoxides and
 as precatalysts for the polymerization of ethylene.
;
_journal_issue                   46
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              16412
_journal_page_last               16427
_journal_paper_doi               10.1039/c3dt52065j
_journal_volume                  42
_journal_year                    2013
_chemical_formula_moiety         'C26 H20 Cl2 Hf N6 O2'
_chemical_formula_sum            'C26 H20 Cl2 Hf N6 O2'
_chemical_formula_weight         697.87
_chemical_name_systematic
;

 ?

;
_space_group_IT_number           9
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'C -2yc'
_symmetry_space_group_name_H-M   'C 1 c 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                 124.5010(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   18.5596(6)
_cell_length_b                   10.9098(3)
_cell_length_c                   15.4502(5)
_cell_measurement_reflns_used    7710
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      28.35
_cell_measurement_theta_min      2.32
_cell_volume                     2578.15(14)
_computing_cell_refinement       'APEXII/SAINT, Bruker,2004'
_computing_data_collection       'APEXII, Bruker,2004'
_computing_data_reduction        'SAINT PLUS/XPREP, Bruker,2004'
_computing_molecular_graphics    'ORTEP-3   (Farrugia, 1997)'
_computing_publication_material  'SHELXL-97  (Sheldrick, 2008)'
_computing_structure_refinement  'SHELXL-97  (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97  (Sheldrick, 2008)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.903
_diffrn_measured_fraction_theta_max 0.820
_diffrn_measurement_device_type  'Bruker APEXII CCD area detector'
_diffrn_measurement_method       'phi and omega 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  0.0162
_diffrn_reflns_av_sigmaI/netI    0.0193
_diffrn_reflns_limit_h_max       24
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            8579
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         28.34
_diffrn_reflns_theta_min         2.29
_exptl_absorpt_coefficient_mu    4.290
_exptl_absorpt_correction_T_max  0.4808
_exptl_absorpt_correction_T_min  0.3406
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Bruker, 2004)'
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.798
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Hexagonal
_exptl_crystal_F_000             1360
_exptl_crystal_size_max          0.32
_exptl_crystal_size_mid          0.25
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.404
_refine_diff_density_min         -0.661
_refine_diff_density_rms         0.060
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.493(14)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.044
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     325
_refine_ls_number_reflns         3569
_refine_ls_number_restraints     206
_refine_ls_restrained_S_all      1.044
_refine_ls_R_factor_all          0.0127
_refine_ls_R_factor_gt           0.0124
_refine_ls_shift/su_max          0.005
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0177P)^2^+1.8126P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0322
_refine_ls_wR_factor_ref         0.0324
_reflns_number_gt                3509
_reflns_number_total             3569
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c3dt52065j.txt
_cod_data_source_block           HfCl
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 1891 2012-01-12 08:04:46Z andrius 
;
_cod_original_sg_symbol_Hall     ' -2yc'
_cod_original_sg_symbol_H-M      Cc
_cod_database_code               7023952