Computational and Crystallographic Studies of Pseudo-Polyhalides
Walsh, Rosa D.; Smith, Jessica M.; Hanks, Timothy W.; Pennington, William T.; Crystal Growth & Design 12 (2012) 2759–; doi:10.1021/cg201231t

data_4506135
_publ_section_title
;
 Computational and Crystallographic Studies of Pseudo-Polyhalides
;
_journal_issue                   6
_journal_name_full               'Crystal Growth &amp; Design'
_journal_page_first              2759
_journal_paper_doi               10.1021/cg201231t
_journal_volume                  12
_journal_year                    2012
_chemical_formula_sum            'C20 H36 I7 K N2 O6'
_chemical_formula_weight         1327.91
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           19
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_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                90.00
_cell_formula_units_Z            4
_cell_length_a                   9.7118(14)
_cell_length_b                   14.9503(19)
_cell_length_c                   25.800(3)
_cell_measurement_temperature    293(2)
_cell_volume                     3746.0(8)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.993
_diffrn_measured_fraction_theta_max 0.993
_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  0.0759
_diffrn_reflns_av_sigmaI/netI    0.0381
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -18
_diffrn_reflns_limit_l_max       32
_diffrn_reflns_limit_l_min       -31
_diffrn_reflns_number            36822
_diffrn_reflns_theta_full        26.50
_diffrn_reflns_theta_max         26.50
_diffrn_reflns_theta_min         2.62
_exptl_absorpt_coefficient_mu    5.942
_exptl_crystal_density_diffrn    2.355
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             2432
_refine_diff_density_max         1.822
_refine_diff_density_min         -1.867
_refine_diff_density_rms         0.209
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.03(7)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.100
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     323
_refine_ls_number_reflns         7711
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.100
_refine_ls_R_factor_all          0.0809
_refine_ls_R_factor_gt           0.0750
_refine_ls_shift/su_max          0.098
_refine_ls_shift/su_mean         0.007
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0697P)^2^+45.2935P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1807
_refine_ls_wR_factor_ref         0.1890
_reflns_number_gt                7223
_reflns_number_total             7711
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            cg201231t_si_001.cif
_cod_data_source_block           cd0036
_cod_database_code               4506135