INSIGHTS into the structures adopted by titanocalix[6 and 8]arenes and their use in the ring opening polymerization of cyclic esters.
Santoro, Orlando; Elsegood, Mark R. J.; Bedwell, Elizabeth V.; Pryce, Jake A.; Redshaw, Carl; Dalton transactions (Cambridge, England : 2003) 49 (2020) 11978–11996; doi:10.1039/d0dt02130j

data_7705096
_publ_section_title
;
 INSIGHTS into the structures adopted by titanocalix[6 and 8]arenes and
 their use in the ring opening polymerization of cyclic esters.
;
_journal_issue                   34
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              11978
_journal_page_last               11996
_journal_paper_doi               10.1039/d0dt02130j
_journal_volume                  49
_journal_year                    2020
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C30 H44 Br2 O2 Ti, C6 H14'
_chemical_formula_sum            'C36 H58 Br2 O2 Ti'
_chemical_formula_weight         730.54
_space_group_crystal_system      orthorhombic
_space_group_IT_number           36
_space_group_name_Hall           'C 2c -2'
_space_group_name_H-M_alt        'C m c 21'
_atom_sites_solution_hydrogens   mixed
_atom_sites_solution_primary     iterative
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-2018/3
_audit_update_record
;
2020-07-08 deposited with the CCDC.	2020-08-10 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   16.4524(3)
_cell_length_b                   12.3781(2)
_cell_length_c                   18.0939(3)
_cell_measurement_reflns_used    17635
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      31.30
_cell_measurement_theta_min      2.07
_cell_volume                     3684.81(11)
_computing_cell_refinement       'CrysAlisPro 1.171.40.67a (Rigaku OD, 2019)'
_computing_data_collection       'CrysAlisPro 1.171.40.67a (Rigaku OD, 2019)'
_computing_data_reduction        'CrysAlisPro 1.171.40.67a (Rigaku OD, 2019)'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-2018/3 (Sheldrick, 2018)'
_computing_structure_solution    'SHELXT 2018/2 (Sheldrick, 2018)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector_area_resol_mean 10
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device       'four-circle diffractometer'
_diffrn_measurement_device_type
; 
Rigaku FRE+ equipped with VHF Varimax confocal mirrors and an AFC12 
goniometer and HyPix 6000 detector 
;
_diffrn_measurement_method       'profile data from \w-scans'
_diffrn_radiation_collimation    0.2
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0367
_diffrn_reflns_av_unetI/netI     0.0236
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.999
_diffrn_reflns_limit_h_max       22
_diffrn_reflns_limit_h_min       -22
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            31640
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.997
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         28.694
_diffrn_reflns_theta_min         2.059
_diffrn_source                   'Rotating Anode'
_exptl_absorpt_coefficient_mu    2.429
_exptl_absorpt_correction_T_max  1.000
_exptl_absorpt_correction_T_min  0.533
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
; 
CrysAlisPro 1.171.40.67a (Rigaku Oxford Diffraction, 2019) 
Empirical absorption correction using spherical harmonics, 
 implemented in SCALE3 ABSPACK scaling algorithm. 
;
_exptl_crystal_colour            red
_exptl_crystal_density_diffrn    1.317
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       'cut needle'
_exptl_crystal_F_000             1528
_exptl_crystal_recrystallization_method
'Re-crystallisation from solvent: hexane'
_exptl_crystal_size_max          0.220
_exptl_crystal_size_mid          0.060
_exptl_crystal_size_min          0.040
_refine_diff_density_max         0.537
_refine_diff_density_min         -0.716
_refine_diff_density_rms         0.081
_refine_ls_abs_structure_details
;
 Flack x determined using 2166 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   -0.009(4)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.054
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     253
_refine_ls_number_reflns         4905
_refine_ls_number_restraints     291
_refine_ls_restrained_S_all      1.061
_refine_ls_R_factor_all          0.0291
_refine_ls_R_factor_gt           0.0273
_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^)+(0.0495P)^2^+0.6217P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0677
_refine_ls_wR_factor_ref         0.0686
_reflns_Friedel_coverage         0.935
_reflns_Friedel_fraction_full    0.998
_reflns_Friedel_fraction_max     0.995
_reflns_number_gt                4716
_reflns_number_total             4905
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d0dt02130j2.cif
_cod_data_source_block           12
_cod_depositor_comments
'Adding full bibliography for 7705091--7705102.cif.'
_cod_database_code               7705096
_shelx_shelxl_version_number     2018/3
_shelx_estimated_absorpt_t_min   0.617
_shelx_estimated_absorpt_t_max   0.909
_shelx_res_checksum              26721