Popcorn-shaped polyethylene synthesised using highly active supported permethylindenyl metallocene catalyst systems.
Buffet, Jean-Charles; Turner, Zoë R; O'Hare, Dermot; Chemical communications (Cambridge, England) 54 (2018) 10970–10973; doi:10.1039/c8cc05350b

data_7122247
_publ_section_title
;
 Popcorn-shaped polyethylene synthesised using highly active supported
 permethylindenyl metallocene catalyst systems.
;
_journal_issue                   78
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              10970
_journal_page_last               10973
_journal_paper_doi               10.1039/c8cc05350b
_journal_volume                  54
_journal_year                    2018
_chemical_absolute_configuration unk
_chemical_formula_moiety         'C38 H50 Si1'
_chemical_formula_sum            'C38 H50 Si'
_chemical_formula_weight         534.90
_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   difmap
_atom_sites_solution_primary     direct
_audit_creation_date             2018-06-13
_audit_creation_method           CRYSTALS_ver_14.43
_audit_update_record
;
2018-06-13 deposited with the CCDC.
2018-08-24 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   10.02650(10)
_cell_length_b                   12.77980(10)
_cell_length_c                   25.9558(3)
_cell_measurement_reflns_used    4247
_cell_measurement_temperature    150
_cell_measurement_theta_max      27
_cell_measurement_theta_min      5
_cell_volume                     3325.89(6)
_computing_cell_refinement       'DENZO/SCALEPACK (Otwinowski & Minor, 1997)'
_computing_data_collection       'COLLECT (Nonius, 2001).'
_computing_data_reduction        'DENZO/SCALEPACK (Otwinowski & Minor, 1997)'
_computing_molecular_graphics    'CAMERON (Watkin et al., 1996)'
_computing_publication_material  'CRYSTALS (Betteridge et al., 2003)'
_computing_structure_refinement  'CRYSTALS (Betteridge et al., 2003)'
_computing_structure_solution    'SIR92 (Altomare et al., 1994)'
_diffrn_ambient_temperature      150
_diffrn_measured_fraction_theta_full 0.990
_diffrn_measured_fraction_theta_max 0.989
_diffrn_measurement_device       Area
_diffrn_measurement_device_type  'Nonius KappaCCD'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.022
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       33
_diffrn_reflns_limit_l_min       -33
_diffrn_reflns_number            69900
_diffrn_reflns_theta_full        26.942
_diffrn_reflns_theta_max         27.492
_diffrn_reflns_theta_min         5.133
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.094
_exptl_absorpt_correction_T_max  0.97
_exptl_absorpt_correction_T_min  0.91
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'DENZO/SCALEPACK (Otwinowski & Minor, 1997)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.068
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1168
_exptl_crystal_size_max          0.460
_exptl_crystal_size_mid          0.340
_exptl_crystal_size_min          0.320
_refine_diff_density_max         0.34
_refine_diff_density_min         -0.22
_refine_ls_extinction_method     None
_refine_ls_goodness_of_fit_ref   0.9099
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     352
_refine_ls_number_reflns         4228
_refine_ls_number_restraints     0
_refine_ls_R_factor_all          0.0563
_refine_ls_R_factor_gt           0.0445
_refine_ls_shift/su_max          0.0066088
_refine_ls_shift/su_mean         0.0006884
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
;
 Method, part 1, Chebychev polynomial, (Watkin, 1994, Prince, 1982) 
 [weight] = 1.0/[A~0~*T~0~(x)+A~1~*T~1~(x) ... +A~n-1~]*T~n-1~(x)] 
 where A~i~ are the Chebychev coefficients listed below and x= Fcalc/Fmax 
 Method = Robust Weighting (Prince, 1982) 
 W = [weight] * [1-(deltaF/6*sigmaF)^2^]^2^ 
 A~i~ are: 
 17.1 25.6 12.2 2.92 
;
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.1161
_refine_ls_wR_factor_gt          0.1033
_refine_ls_wR_factor_ref         0.1161
_reflns_limit_h_max              13
_reflns_limit_h_min              0
_reflns_limit_k_max              16
_reflns_limit_k_min              0
_reflns_limit_l_max              33
_reflns_limit_l_min              0
_reflns_number_gt                3570
_reflns_number_total             4228
_reflns_threshold_expression     I>2.0\s(I)
_oxford_diffrn_Wilson_B_factor   2.76
_oxford_diffrn_Wilson_scale      6.18
_oxford_refine_ls_r_factor_ref   0.0563
_oxford_refine_ls_scale          0.4350(7)
_oxford_reflns_number_all        4228
_oxford_reflns_threshold_expression_ref I>-3.0\s(I)
_oxford_structure_analysis_title '003TAQA14 At 11:24 on 4/ 3'
_iucr_refine_instructions_details_constraints
;
BLOCK SCALE X'S, U'S 
RIDE C   (   1,X'S) H   (  11,X'S) 
RIDE C   (  10,X'S) H   ( 102,X'S) H   ( 101,X'S) H   ( 103,X'S) 
RIDE C   (  11,X'S) H   ( 112,X'S) H   ( 111,X'S) H   ( 113,X'S) 
RIDE C   (  12,X'S) H   ( 122,X'S) H   ( 121,X'S) H   ( 123,X'S) 
RIDE C   (  13,X'S) H   ( 132,X'S) H   ( 131,X'S) H   ( 133,X'S) 
RIDE C   (  14,X'S) H   ( 142,X'S) H   ( 141,X'S) H   ( 143,X'S) 
RIDE C   (  15,X'S) H   ( 152,X'S) H   ( 151,X'S) H   ( 153,X'S) 
RIDE C   (  16,X'S) H   ( 162,X'S) H   ( 161,X'S) H   ( 163,X'S) 
RIDE C   (  17,X'S) H   ( 172,X'S) H   ( 171,X'S) H   ( 173,X'S) 
RIDE C   (  18,X'S) H   ( 181,X'S) 
RIDE C   (  20,X'S) H   ( 201,X'S) 
RIDE C   (  22,X'S) H   ( 221,X'S) 
RIDE C   (  23,X'S) H   ( 231,X'S) 
RIDE C   (  26,X'S) H   ( 261,X'S) 
RIDE C   (  27,X'S) H   ( 271,X'S) 
RIDE C   (  29,X'S) H   ( 291,X'S) 
RIDE C   (  32,X'S) H   ( 322,X'S) H   ( 321,X'S) H   ( 323,X'S) 
RIDE C   (  33,X'S) H   ( 332,X'S) H   ( 331,X'S) H   ( 333,X'S) 
RIDE C   (  34,X'S) H   ( 342,X'S) H   ( 341,X'S) H   ( 343,X'S) 
RIDE C   (  36,X'S) H   ( 362,X'S) H   ( 361,X'S) H   ( 363,X'S) 
RIDE C   (  37,X'S) H   ( 372,X'S) H   ( 371,X'S) H   ( 373,X'S) 
RIDE C   (  38,X'S) H   ( 382,X'S) H   ( 381,X'S) H   ( 383,X'S) 
END                                                                             
;
_iucr_refine_instructions_details_restraints
;
NO 
REM   HREST   START (DO NOT REMOVE THIS LINE) 
REM   HREST   END (DO NOT REMOVE THIS LINE) 
END                                                                             
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_cod_data_source_file            c8cc05350b2.cif
_cod_data_source_block           003TAQA14-ZRT
_cod_depositor_comments
'Adding full bibliography for 7122247--7122252.cif.'
_cod_original_sg_symbol_H-M      'P 21 21 21 '
_cod_original_formula_sum        'C38 H50 Si1'
_cod_database_code               7122247