Synthesis and Characterization of Benzotriazole or Benzoxazole Phenoxide Ligands Supported Nb and Ta Metal Complexes and their Application for the Synthesis of Hyperbranched Polyglycerols by Ring-Opening Polymerisation of Glycidol
pappuru, sreenath; Chakraborty, Debashis; V, Ramkumar; Dalton Transactions  (2017) –; doi:10.1039/C7DT02839C

data_7044717
_publ_section_title
;
 Synthesis and Characterization of Benzotriazole or Benzoxazole Phenoxide
 Ligands Supported Nb and Ta Metal Complexes and their Application for the
 Synthesis of Hyperbranched Polyglycerols by Ring-Opening Polymerisation
 of Glycidol
;
_journal_name_full               'Dalton Transactions'
_journal_paper_doi               10.1039/C7DT02839C
_journal_year                    2017
_chemical_formula_moiety         'C21 H24 Cl4 N O2 Ta'
_chemical_formula_sum            'C21 H24 Cl4 N O2 Ta'
_chemical_formula_weight         645.16
_space_group_crystal_system      triclinic
_space_group_IT_number           2
_space_group_name_Hall           '-P 1'
_space_group_name_H-M_alt        'P -1'
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2014/7
_audit_update_record
;
2017-11-01 deposited with the CCDC.
2017-11-07 downloaded from the CCDC.
;
_cell_angle_alpha                96.826(10)
_cell_angle_beta                 90.660(11)
_cell_angle_gamma                97.503(11)
_cell_formula_units_Z            2
_cell_length_a                   6.3077(15)
_cell_length_b                   10.738(3)
_cell_length_c                   18.004(5)
_cell_measurement_reflns_used    9676
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      30.69
_cell_measurement_theta_min      2.80
_cell_volume                     1200.0(6)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_computing_structure_solution    'SHELXS-97 (Sheldrick 2008)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0236
_diffrn_reflns_av_unetI/netI     0.0215
_diffrn_reflns_Laue_measured_fraction_full 0.996
_diffrn_reflns_Laue_measured_fraction_max 0.996
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            17135
_diffrn_reflns_point_group_measured_fraction_full 0.996
_diffrn_reflns_point_group_measured_fraction_max 0.996
_diffrn_reflns_theta_full        24.997
_diffrn_reflns_theta_max         24.997
_diffrn_reflns_theta_min         1.927
_exptl_absorpt_coefficient_mu    5.042
_exptl_absorpt_correction_T_max  0.633
_exptl_absorpt_correction_T_min  0.518
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS V2014/5(Bruker AXS.Inc)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.786
_exptl_crystal_description       Block
_exptl_crystal_F_000             628
_exptl_crystal_size_max          0.150
_exptl_crystal_size_mid          0.100
_exptl_crystal_size_min          0.100
_refine_diff_density_max         1.341
_refine_diff_density_min         -1.170
_refine_diff_density_rms         0.098
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.192
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     268
_refine_ls_number_reflns         4215
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.192
_refine_ls_R_factor_all          0.0271
_refine_ls_R_factor_gt           0.0252
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0006P)^2^+5.1248P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0623
_refine_ls_wR_factor_ref         0.0630
_reflns_Friedel_coverage         0.000
_reflns_number_gt                3998
_reflns_number_total             4215
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c7dt02839c2.cif
_cod_data_source_block           ta
_cod_original_cell_volume        1200.0(5)
_cod_database_code               7044717
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.518
_shelx_estimated_absorpt_t_max   0.633
_shelx_res_checksum              57262