Calculations of optical properties of the tetraphenyl-X family of isomorphous crystals (X = C, Si, Ge, Sn, Pb)
Claborn, Kacey; Kahr, Bart; Kaminsky, Werner; CrystEngComm 4 (2002) 252–256; doi:10.1039/b202304k

data_7204395
_publ_section_title
;
 Calculations of optical properties of the tetraphenyl-X family of
 isomorphous crystals (X = C, Si, Ge, Sn, Pb)
;
_journal_coden_ASTM              CRECF4
_journal_issue                   46
_journal_name_full               CrystEngComm
_journal_page_first              252
_journal_page_last               256
_journal_paper_doi               10.1039/b202304k
_journal_volume                  4
_journal_year                    2002
_chemical_formula_moiety         'C6.25 H5'
_chemical_formula_sum            'C6.25 H5'
_chemical_formula_weight         80.10
_chemical_name_common            Ph4C
_chemical_name_systematic        Ph4C
_space_group_IT_number           114
_symmetry_cell_setting           tetragonal
_symmetry_space_group_name_Hall  'P -4 2n'
_symmetry_space_group_name_H-M   'P -4 21 c'
_atom_sites_solution_hydrogens   difmap
_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                90.00
_cell_formula_units_Z            8
_cell_length_a                   10.9050(10)
_cell_length_b                   10.9050(10)
_cell_length_c                   7.2850(5)
_cell_measurement_reflns_used    166
_cell_measurement_temperature    293(2)
_cell_volume                     866.33(13)
_computing_cell_refinement       'HKL SCALEPACK'
_computing_data_collection       KappaCCD
_computing_data_reduction        DENZO
_computing_molecular_graphics    'maXus, Zortep'
_computing_publication_material  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    SIR92
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Nonius KappaCCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71070
_diffrn_reflns_av_R_equivalents  0.041
_diffrn_reflns_av_sigmaI/netI    0.0550
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       8
_diffrn_reflns_limit_l_min       -8
_diffrn_reflns_number            733
_diffrn_reflns_theta_full        24.68
_diffrn_reflns_theta_max         24.68
_diffrn_reflns_theta_min         3.36
_exptl_absorpt_coefficient_mu    0.069
_exptl_absorpt_correction_T_max  0.9924
_exptl_absorpt_correction_T_min  0.9883
_exptl_absorpt_correction_type   HKL-Scalepack
_exptl_crystal_colour            brownish-clear
_exptl_crystal_density_diffrn    1.228
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       'cut needle'
_exptl_crystal_F_000             340
_exptl_crystal_size_max          0.17
_exptl_crystal_size_mid          0.11
_exptl_crystal_size_min          0.11
_refine_diff_density_max         0.132
_refine_diff_density_min         -0.171
_refine_diff_density_rms         0.053
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -10(10)
_refine_ls_extinction_coef       0.082(15)
_refine_ls_extinction_expression Fc^*^=3DkFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.066
_refine_ls_hydrogen_treatment    full-isotropic
_refine_ls_matrix_type           full
_refine_ls_number_parameters     78
_refine_ls_number_reflns         733
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.066
_refine_ls_R_factor_all          0.0650
_refine_ls_R_factor_gt           0.0388
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_scheme
;
calc w=3D1/[\s^2^(Fo^2^)+(0.0306P)^2^+0.0880P] where 
P=3D(Fo^2^+2Fc^2^)/3
;
_refine_ls_wR_factor_gt          0.0816
_refine_ls_wR_factor_ref         0.0946
_reflns_number_gt                555
_reflns_number_total             733
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b202304k.txt
_cod_data_source_block           Ph4C
_cod_database_code               7204395