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_7044715
_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         'C17 H16 Br2 Cl2 N Nb O4 '
_chemical_formula_sum            'C17 H16 Br2 Cl2 N Nb O4'
_chemical_formula_weight         621.94
_chemical_name_systematic
;
 ?
;
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2013
_audit_update_record
;
2017-11-01 deposited with the CCDC.
2017-11-07 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 95.613(8)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   8.7687(15)
_cell_length_b                   15.917(3)
_cell_length_c                   15.407(3)
_cell_measurement_reflns_used    6261
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      26.25
_cell_measurement_theta_min      2.26
_cell_volume                     2140.1(7)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'SHELXL-2013 (Sheldrick, 2013)'
_computing_structure_refinement  'SHELXL-2014 (Sheldrick, 2014)'
_computing_structure_solution    'SHELXL-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.974
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker APEX II'
_diffrn_measurement_method       'Phi and Omega scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0259
_diffrn_reflns_av_unetI/netI     0.0240
_diffrn_reflns_Laue_measured_fraction_full 0.974
_diffrn_reflns_Laue_measured_fraction_max 0.999
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -18
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            16702
_diffrn_reflns_point_group_measured_fraction_full 0.974
_diffrn_reflns_point_group_measured_fraction_max 0.999
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         24.999
_diffrn_reflns_theta_min         1.844
_exptl_absorpt_coefficient_mu    4.568
_exptl_absorpt_correction_T_max  0.658
_exptl_absorpt_correction_T_min  0.395
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Bruker,2014)'
_exptl_crystal_colour            white
_exptl_crystal_density_diffrn    1.930
_exptl_crystal_description       block
_exptl_crystal_F_000             1208
_exptl_crystal_size_max          0.250
_exptl_crystal_size_mid          0.150
_exptl_crystal_size_min          0.100
_refine_diff_density_max         0.878
_refine_diff_density_min         -0.844
_refine_diff_density_rms         0.074
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.034
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     267
_refine_ls_number_reflns         3774
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.033
_refine_ls_R_factor_all          0.0430
_refine_ls_R_factor_gt           0.0304
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0355P)^2^+2.3494P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0697
_refine_ls_wR_factor_ref         0.0753
_reflns_Friedel_coverage         0.000
_reflns_number_gt                3076
_reflns_number_total             3774
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c7dt02839c2.cif
_cod_data_source_block           dibrnb
_cod_database_code               7044715
_shelx_estimated_absorpt_t_min   0.395
_shelx_estimated_absorpt_t_max   0.658
_shelxl_version_number           2013-4
_shelx_res_checksum              73492