<i>N</i>,<i>N</i>'-Dibenzoylpiperazine
Zheng, Peng-Wu; Wang, Wei; Duan, Xue-Min; Acta Crystallographica Section E 61 (2005) o2513–o2514; doi:10.1107/S160053680502088X

data_2206396
_publ_section_title
;
 <i>N</i>,<i>N</i>'-Dibenzoylpiperazine
;
_journal_coeditor_code           CV6540
_journal_issue                   8
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o2513
_journal_page_last               o2514
_journal_paper_doi               10.1107/S160053680502088X
_journal_volume                  61
_journal_year                    2005
_chemical_formula_iupac          'C18 H18 N2 O2'
_chemical_formula_moiety         'C18 H18 N2 O2'
_chemical_formula_sum            'C18 H18 N2 O2'
_chemical_formula_weight         294.34
_chemical_melting_point          471.0(10)
_chemical_name_systematic
;
N,N'-dibenzoylpiperazine
;
_space_group_IT_number           61
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2ab'
_symmetry_space_group_name_H-M   'P b c a'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.8486(13)
_cell_length_b                   6.8254(12)
_cell_length_c                   28.771(5)
_cell_measurement_reflns_used    2532
_cell_measurement_temperature    294(2)
_cell_measurement_theta_max      26.39
_cell_measurement_theta_min      2.83
_cell_volume                     1541.3(5)
_computing_cell_refinement       'SAINT (Bruker, 1997)'
_computing_data_collection       'SMART (Bruker, 1997)'
_computing_data_reduction        SAINT
_computing_molecular_graphics    'SHELXTL (Bruker, 1997)'
_computing_publication_material  SHELXTL
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      294(2)
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'Bruker SMART CCD area-detector'
_diffrn_measurement_method       '\f and \w'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0374
_diffrn_reflns_av_sigmaI/netI    0.0275
_diffrn_reflns_limit_h_max       5
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       35
_diffrn_reflns_limit_l_min       -35
_diffrn_reflns_number            7944
_diffrn_reflns_theta_full        26.43
_diffrn_reflns_theta_max         26.43
_diffrn_reflns_theta_min         1.42
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.084
_exptl_absorpt_correction_T_max  0.983
_exptl_absorpt_correction_T_min  0.930
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS; Sheldrick, 1996)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.268
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             624
_exptl_crystal_size_max          0.26
_exptl_crystal_size_mid          0.24
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.168
_refine_diff_density_min         -0.142
_refine_ls_extinction_coef       0.060(4)
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.020
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     101
_refine_ls_number_reflns         1580
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.020
_refine_ls_R_factor_all          0.0576
_refine_ls_R_factor_gt           0.0382
_refine_ls_shift/su_max          0.004
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w = 1/[\s^2^(Fo^2^)+(0.0513P)^2^+0.3539P] where P = (Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0941
_refine_ls_wR_factor_ref         0.1062
_reflns_number_gt                1168
_reflns_number_total             1580
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            cv6540.cif
_cod_data_source_block           I
_cod_original_sg_symbol_Hall     '-P 2ac2ab'
_cod_database_code               2206396
_cod_database_fobs_code          2206396