Synthesis, Characterization, and Fluorescence Behavior of Twisted and Planar B~2~N~2~-Quaterphenyl Analogues
Cory A. Jaska; Warren E. Piers; Robert McDonald; Masood Parvez; Journal of Organic Chemistry 72 (2007) 5234–5243; doi:10.1021/jo0706574

data_4024000
_publ_section_title
;
 Synthesis, Characterization, and Fluorescence Behavior of
 Twisted and Planar B~2~N~2~-Quaterphenyl Analogues
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              5234
_journal_page_last               5243
_journal_paper_doi               10.1021/jo0706574
_journal_volume                  72
_journal_year                    2007
_chemical_formula_sum            'C21 H20 B2 Cl2 N2'
_chemical_formula_weight         392.91
_chemical_name_systematic
;
 ?
;
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_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                   9.901(2)
_cell_length_b                   12.982(6)
_cell_length_c                   15.803(7)
_cell_measurement_temperature    173(2)
_cell_volume                     2031.2(14)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.988
_diffrn_measured_fraction_theta_max 0.988
_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  0.0000
_diffrn_reflns_av_sigmaI/netI    0.0514
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            4557
_diffrn_reflns_theta_full        27.48
_diffrn_reflns_theta_max         27.48
_diffrn_reflns_theta_min         3.14
_exptl_absorpt_coefficient_mu    0.327
_exptl_absorpt_correction_T_max  0.9618
_exptl_absorpt_correction_T_min  0.9374
_exptl_absorpt_correction_type   none
_exptl_crystal_density_diffrn    1.285
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             816
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.14
_exptl_crystal_size_min          0.12
_refine_diff_density_max         0.204
_refine_diff_density_min         -0.342
_refine_diff_density_rms         0.047
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.04(6)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.032
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     244
_refine_ls_number_reflns         4557
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.032
_refine_ls_R_factor_all          0.0753
_refine_ls_R_factor_gt           0.0457
_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^)+(0.0500P)^2^+0.4400P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0944
_refine_ls_wR_factor_ref         0.1082
_reflns_number_gt                3461
_reflns_number_total             4557
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo0706574si20070330_124614.cif
_cod_data_source_block           c5
_cod_database_code               4024000