Metal-assisted electrocyclic reaction in a CN–NC–CN system
Pal, Pankaj K.; Chowdhury, Shubhamoy; Drew, Michael G. B.; Datta, Dipankar; New Journal of Chemistry 24 (2000) 931–; doi:10.1039/b006547l

data_7051369
_publ_section_title
;
 Metal-assisted electrocyclic reaction in a
 C&#xE006;N--N&#xE006;C--C&#xE006;N system
;
_journal_issue                   12
_journal_name_full               'New Journal of Chemistry'
_journal_page_first              931
_journal_paper_doi               10.1039/b006547l
_journal_volume                  24
_journal_year                    2000
_chemical_formula_sum            'C26 H20 N6'
_chemical_formula_weight         416.48
_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   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 105.800(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.404(14)
_cell_length_b                   18.94(2)
_cell_length_c                   11.673(14)
_cell_measurement_temperature    293(2)
_cell_volume                     2213(5)
_computing_cell_refinement       XDS
_computing_data_collection       'XDS (Kabsch, 1991)'
_computing_data_reduction        XDS
_computing_molecular_graphics    PLATON(Spek,1994)
_computing_structure_refinement  'SHELXL-93 (Sheldrick, 1993)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measurement_device       'Marresearch Image Plate'
_diffrn_measurement_method
'95 frames at 2^o intervals, counting time 2 min.'
_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  0.0375
_diffrn_reflns_av_sigmaI/netI    0.0477
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       23
_diffrn_reflns_limit_k_min       -23
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            7894
_diffrn_reflns_theta_max         26.03
_diffrn_reflns_theta_min         2.15
_exptl_absorpt_coefficient_mu    0.078
_exptl_absorpt_correction_type   none
_exptl_crystal_density_diffrn    1.250
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             872
_refine_diff_density_max         0.281
_refine_diff_density_min         -0.206
_refine_diff_density_rms         0.045
_refine_ls_extinction_coef       0.015(3)
_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   1.035
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     290
_refine_ls_number_reflns         4337
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.035
_refine_ls_R_factor_all          0.1218
_refine_ls_R_factor_gt           0.0695
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.1349P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1867
_refine_ls_wR_factor_ref         0.2214
_reflns_number_gt                2576
_reflns_number_total             4337
_reflns_threshold_expression     2sigma(I)
_cod_data_source_file            b006547l.txt
_cod_data_source_block           L
_cod_depositor_comments
;
The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.1349P)^2^+0.0000P] 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^)+(0.1349P)^2^+0.0000P] 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      P21/c
_cod_original_formula_sum        'C26 H20 N6 '
_cod_database_code               7051369