Synthetic, structural and theoretical studies on new aromatic 1,2,4-azadiphosphole ring systems: crystal and molecular structure of P2C2But2NPh
Cloke, F. Geoffrey N.; Hitchcock, Peter B.; Nixon, John F.; James Wilson, D.; Tabellion, Frank; Fischbeck, Uwe; Preuss, Fritz; Regitz, Manfred; Chemical Communications  (1999) 2363–; doi:10.1039/a907550j

data_7110722
_publ_section_title
;
 Synthetic, structural and theoretical studies on new aromatic
 1,2,4-azadiphosphole ring systems: crystal and molecular structure of
 P2C2But2NPh
;
_journal_issue                   23
_journal_name_full               'Chemical Communications'
_journal_page_first              2363
_journal_paper_doi               10.1039/a907550j
_journal_year                    1999
_chemical_formula_sum            'C16 H23 N P2'
_chemical_formula_weight         291.29
_chemical_name_common            '[C2tBu2P2NPh]'
_space_group_IT_number           33
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2c -2n'
_symmetry_space_group_name_H-M   'P n a 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   26.960(5)
_cell_length_b                   5.916(2)
_cell_length_c                   10.299(3)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      10
_cell_measurement_theta_min      7
_cell_volume                     1642.6(8)
_computing_cell_refinement       'Enraf-Nonius CAD4'
_computing_data_collection       'Enraf-Nonius CAD4'
_computing_molecular_graphics    'CAMERON (Watkin and Pearce,1993)'
_computing_publication_material  SHELXL-93
_computing_structure_refinement  'SHELXL-93 (Sheldrick, 1993)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_measurement_device       ' Enraf-Nonius CAD4'
_diffrn_measurement_method       \w--2\q
_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    0.0751
_diffrn_reflns_limit_h_max       28
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       6
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            1071
_diffrn_reflns_theta_max         21.96
_diffrn_reflns_theta_min         2.49
_diffrn_standards_decay_%        0
_diffrn_standards_interval_time  120
_diffrn_standards_number         2
_exptl_absorpt_coefficient_mu    0.253
_exptl_absorpt_correction_type   none
_exptl_crystal_density_diffrn    1.178
_exptl_crystal_F_000             624
_exptl_crystal_size_max          0.10
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.276
_refine_diff_density_min         -0.306
_refine_diff_density_rms         0.067
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.10(28)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_all   1.110
_refine_ls_goodness_of_fit_obs   1.031
_refine_ls_hydrogen_treatment    riding
_refine_ls_matrix_type           full
_refine_ls_number_parameters     172
_refine_ls_number_reflns         1071
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.110
_refine_ls_restrained_S_obs      1.030
_refine_ls_R_factor_all          0.0690
_refine_ls_R_factor_obs          0.0444
_refine_ls_shift/esd_max         0.000
_refine_ls_shift/esd_mean        0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0168P)^2^+2.1122P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.1058
_refine_ls_wR_factor_obs         0.0860
_reflns_number_observed          859
_reflns_number_total             1071
_reflns_observed_criterion       >2sigma(I)
_cod_data_source_file            907550jsup1.cif
_cod_data_source_block           aug698
_cod_depositor_comments
;
The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.0168P)^2^+2.1122P] where P=(Fo^2^+2Fc^2^)/3' was
changed to 'calc'. New tag '_refine_ls_weighting_details' was
created. The value of the new tag was set to
'w=1/[\s^2^(Fo^2^)+(0.0168P)^2^+2.1122P] where P=(Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_original_sg_symbol_H-M      Pna2(1)
_cod_database_code               7110722