Nanotube Formation Favored by Chalcogen-Chalcogen Interactions
Daniel B. Werz; Rolf Gleiter; Frank Rominger; Journal of the American Chemical Society 124 (2002) 10638–10639; doi:10.1021/ja027146d

data_4115121
_publ_contact_author_address
;
        Organisch-Chemisches Institut
        Universit\"at Heidelberg
        Im Neuenheimer Feld 270
        D-69120 Heidelberg
        Germany
;
_publ_contact_author_email       rolf.gleiter@urz.uni-heidelberg.de
_publ_contact_author_fax         '049 6221 54- 4205'
_publ_contact_author_name        'Gleiter, Rolf'
_publ_contact_author_phone       '049 6221 54- 8400'
_publ_section_title
;
 Nanotube Formation Favored by Chalcogen-Chalcogen Interactions
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              10638
_journal_page_last               10639
_journal_paper_doi               10.1021/ja027146d
_journal_volume                  124
_journal_year                    2002
_chemical_formula_sum            'C27 H30 Se6'
_chemical_formula_weight         828.27
_chemical_name_systematic
;
 ?
;
_space_group_IT_number           148
_symmetry_cell_setting           rhombohedral
_symmetry_space_group_name_Hall  '-R 3'
_symmetry_space_group_name_H-M   'R -3 :H'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                120.00
_cell_formula_units_Z            6
_cell_length_a                   24.0399(6)
_cell_length_b                   24.0399(6)
_cell_length_c                   10.2535(4)
_cell_measurement_temperature    200(2)
_cell_volume                     5131.8(3)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SHELXTL'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      200(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0498
_diffrn_reflns_av_sigmaI/netI    0.0323
_diffrn_reflns_limit_h_max       31
_diffrn_reflns_limit_h_min       -31
_diffrn_reflns_limit_k_max       31
_diffrn_reflns_limit_k_min       -31
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            17872
_diffrn_reflns_theta_full        27.44
_diffrn_reflns_theta_max         27.44
_diffrn_reflns_theta_min         1.69
_exptl_absorpt_coefficient_mu    6.429
_exptl_absorpt_correction_T_max  0.73
_exptl_absorpt_correction_T_min  0.47
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Blessing, Acta Cryst. (1995) A51 33-38.'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.608
_exptl_crystal_description       polyhedron
_exptl_crystal_F_000             2376
_exptl_crystal_size_max          .42
_exptl_crystal_size_mid          .08
_exptl_crystal_size_min          .06
_refine_diff_density_max         0.796
_refine_diff_density_min         -0.808
_refine_diff_density_rms         0.085
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.029
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     117
_refine_ls_number_reflns         2613
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.029
_refine_ls_R_factor_all          0.0589
_refine_ls_R_factor_gt           0.0337
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0422P)^2^+10.2702P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0786
_refine_ls_wR_factor_ref         0.0870
_reflns_number_gt                1875
_reflns_number_total             2613
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja027146d_s2_5.cif
_cod_data_source_block           dwe57_(in_paper_3*hexane)
_cod_original_sg_symbol_H-M      'R -3'
_cod_database_code               4115121