A step toward polytwistane: synthesis and characterization of C2-symmetric tritwistane.
Olbrich, Martin; Mayer, Peter; Trauner, Dirk; Organic & biomolecular chemistry 12 (2014) 108–112; doi:10.1039/c3ob42152j

data_7153654
_publ_section_title
;
 A step toward polytwistane: synthesis and characterization of
 C2-symmetric tritwistane.
;
_journal_issue                   1
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              108
_journal_page_last               112
_journal_paper_doi               10.1039/c3ob42152j
_journal_volume                  12
_journal_year                    2014
_chemical_formula_moiety         'C14 H14 Br2 Cl4'
_chemical_formula_sum            'C14 H14 Br2 Cl4'
_chemical_formula_weight         483.880
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      14
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_block_code                C14H14Br2Cl4_qn096_trauner
_audit_creation_date             29-Mar-12
_audit_creation_method           'form98_non/compatible with shelxl97-2'
_audit_update_record             29-Mar-12
_cell_angle_alpha                90.00
_cell_angle_beta                 91.061(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   14.7642(7)
_cell_length_b                   7.4391(3)
_cell_length_c                   14.5856(6)
_cell_measurement_reflns_used    5620
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      25.350
_cell_measurement_theta_min      3.134
_cell_volume                     1601.70(12)
_computing_cell_refinement       'HKL Scalepack (Otwinowski & Minor 1997)'
_computing_data_collection       'Collect (Bruker AXS BV, 1997-2004)'
_computing_data_reduction
'HKL Denzo and Scalepack (Otwinowski & Minor 1997)'
_computing_structure_refinement
;
Sheldrick, G. M. (2008).
<i>Acta Cryst.</i> A<b>64</b>, 112--122.
;
_computing_structure_solution
;
A. Altomare, M. C. Burla, M. Camalli, G. L. Cascarano, C. Giacovazzo, A.
Guagliardi, A. G. G. Moliterni, G. Polidori, R. Spagna: SIR97: a new tool for
crystal structure determination and refinement; J. Appl. Crystallogr. 1999,
32, 115-119.
;
_diffrn_ambient_temperature      173(2)
_diffrn_detector_area_resol_mean 9
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device       '95mm CCD camera on \k-goniostat'
_diffrn_measurement_device_type  KappaCCD
_diffrn_measurement_method       'CCD; rotation images; thick slices'
_diffrn_orient_matrix_type       'by Bruker AXS Collect from scalepack cell'
_diffrn_orient_matrix_UB_11      0.0569202
_diffrn_orient_matrix_UB_12      0.0742755
_diffrn_orient_matrix_UB_13      0.0061434
_diffrn_orient_matrix_UB_21      0.0381646
_diffrn_orient_matrix_UB_22      -0.1114805
_diffrn_orient_matrix_UB_23      -0.0026755
_diffrn_orient_matrix_UB_31      0.0023972
_diffrn_orient_matrix_UB_32      0.0111937
_diffrn_orient_matrix_UB_33      -0.0674108
_diffrn_radiation_collimation    0.20
_diffrn_radiation_monochromator  'MONTEL, graded multilayered X-ray optics'
_diffrn_radiation_source         'rotating anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0867
_diffrn_reflns_av_sigmaI/netI    0.0662
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            9823
_diffrn_reflns_theta_full        25.35
_diffrn_reflns_theta_max         25.35
_diffrn_reflns_theta_min         3.14
_diffrn_source_current           55.00
_diffrn_source_power             3.025
_diffrn_source_type              'FR 591 generator'
_diffrn_source_voltage           55.00
_exptl_absorpt_coefficient_mu    5.714
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    2.00665(15)
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             944
_exptl_crystal_size_max          0.03
_exptl_crystal_size_mid          0.03
_exptl_crystal_size_min          0.02
_refine_diff_density_max         0.827
_refine_diff_density_min         -0.722
_refine_diff_density_rms         0.091
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.028
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     181
_refine_ls_number_reflns         2911
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.028
_refine_ls_R_factor_all          0.0647
_refine_ls_R_factor_gt           0.0366
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0395P)^2^+0.0737P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0819
_refine_ls_wR_factor_ref         0.0903
_reflns_number_gt                2061
_reflns_number_total             2911
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c3ob42152j.txt
_cod_data_source_block           qn096
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               7153654