Terphenyl crowns: a new family of receptors containing ethereal canopies that direct potassium cation onto benzenoid platforms for cation-pi interactions.
Shukla, Ruchi; Lindeman, Sergey V; Rathore, Rajendra; Chemical communications (Cambridge, England) 34 (2009) 5600–5602; doi:10.1039/b912796h

data_7104757
_publ_section_title
;
 Terphenyl crowns: a new family of receptors containing ethereal
 canopies that direct potassium cation onto benzenoid platforms for
 cation-pi interactions.
;
_journal_issue                   37
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              5600
_journal_page_last               5602
_journal_paper_doi               10.1039/b912796h
_journal_volume                  34
_journal_year                    2009
_chemical_formula_sum            'C50 H48 B K O5'
_chemical_formula_weight         778.79
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_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                 94.300(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   13.1774(5)
_cell_length_b                   15.6866(6)
_cell_length_c                   19.6322(7)
_cell_measurement_reflns_used    9444
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      61
_cell_measurement_theta_min      3
_cell_volume                     4046.7(3)
_computing_cell_refinement       'SAINT v7.23A (Bruker, 2005)'
_computing_data_collection       'APEX2 v2.0-2 (Bruker, 2005)'
_computing_data_reduction        'SADABS-2004/1 (Bruker, 2005)'
_computing_molecular_graphics    'XP v5.1 (Bruker, 1998)'
_computing_publication_material  'XCIF v6.12 (Bruker, 2001)'
_computing_structure_refinement  'SHELXL-97 v.97-2 (Sheldrick, 1993-1997)'
_computing_structure_solution    'XS/SHELXTL v6.12 (Bruker, 2001)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.980
_diffrn_measured_fraction_theta_max 0.980
_diffrn_measurement_device_type  'Bruker APEX2 CCD detector'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0180
_diffrn_reflns_av_sigmaI/netI    0.0125
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            25942
_diffrn_reflns_theta_full        66.49
_diffrn_reflns_theta_max         61.49
_diffrn_reflns_theta_min         3.36
_exptl_absorpt_coefficient_mu    1.531
_exptl_absorpt_correction_T_max  0.5795
_exptl_absorpt_correction_T_min  0.4602
_exptl_absorpt_correction_type   numerical
_exptl_absorpt_process_details
;
Numerical (based on real shape of the crystal) absorption
correction followed by:
SADABS. Program for empirical absorption correction of
area-detector data. University of Goetingen. Germany.
Sheldrick, G. M. 1996
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.278
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             1648
_exptl_crystal_size_max          0.60
_exptl_crystal_size_mid          0.60
_exptl_crystal_size_min          0.40
_refine_diff_density_max         0.220
_refine_diff_density_min         -0.302
_refine_diff_density_rms         0.032
_refine_ls_extinction_coef       0.00185(9)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.009
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     716
_refine_ls_number_reflns         6139
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.009
_refine_ls_R_factor_all          0.0284
_refine_ls_R_factor_gt           0.0278
_refine_ls_shift/su_max          0.015
_refine_ls_shift/su_mean         0.002
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0468P)^2^+1.5411P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0769
_refine_ls_wR_factor_ref         0.0774
_reflns_number_gt                5989
_reflns_number_total             6139
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b912796h.txt
_cod_data_source_block           raj3sa
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               7104757