Competition between OH⋯O and multiple halogen–dipole interactions on the formation of intramolecular three-centred hydrogen bond in 3-acyl coumarins
Santos-Contreras, Rocío J.; Martínez-Martínez, Francisco J.; Mancilla-Margalli, N. Alejandra; Peraza-Campos, Ana L.; Morín-Sánchez, Luis M.; García-Báez, Efrén V.; Padilla-Martínez, Itzia I.; CrystEngComm 11 (2009) 1451–; doi:10.1039/b818309k

data_7200568
_publ_section_title
;
 Competition between OH&#x22EF;O and multiple halogen--dipole
 interactions on the formation of intramolecular three-centred hydrogen
 bond in 3-acyl coumarins
;
_journal_issue                   7
_journal_name_full               CrystEngComm
_journal_page_first              1451
_journal_paper_doi               10.1039/b818309k
_journal_volume                  11
_journal_year                    2009
_chemical_formula_sum            'C12 H10 Br N O4'
_chemical_formula_weight         312.12
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      14
_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
_cell_angle_beta                 94.459(2)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   8.2813(7)
_cell_length_b                   25.012(2)
_cell_length_c                   5.5283(5)
_cell_measurement_reflns_used    200
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      25
_cell_measurement_theta_min      20
_cell_volume                     1141.62(17)
_computing_cell_refinement       'SAINT (Bruker, 2004)'
_computing_data_collection       'APEX II (Bruker, 2004)'
_computing_data_reduction        'SAINT (Bruker, 2004)'
_computing_molecular_graphics    'SHELXTL (Bruker, 2008)'
_computing_publication_material
'SHELXL97 (Sheldrick, 1997) and WINGX-2003 (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device       'Bruker SMART area detector'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0436
_diffrn_reflns_av_sigmaI/netI    0.0321
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       29
_diffrn_reflns_limit_k_min       -29
_diffrn_reflns_limit_l_max       6
_diffrn_reflns_limit_l_min       -6
_diffrn_reflns_number            10984
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         1.63
_diffrn_standards_decay_%        5
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    3.607
_exptl_absorpt_correction_T_max  0.1686
_exptl_absorpt_correction_T_min  0.1454
_exptl_absorpt_correction_type   sphere
_exptl_absorpt_process_details
;
Interpolation using Int.Tab. Vol. C (1992) p. 523,Tab. 6.3.3.3
for values of muR in the range 0-2.5, and Int.Tab. Vol.II (1959)
p.302; Table 5.3.6 B for muR in the range 2.6-10.0.
The interpolation procedure of C.W.Dwiggins Jr (Acta Cryst.(1975)
A31,146-148) is used with some modification.
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.816
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             624
_exptl_crystal_size_max          0.48
_exptl_crystal_size_mid          0.42
_exptl_crystal_size_min          0.38
_exptl_crystal_size_rad          0.4000
_refine_diff_density_max         1.601
_refine_diff_density_min         -0.791
_refine_diff_density_rms         0.108
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.166
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     163
_refine_ls_number_reflns         2018
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      1.560
_refine_ls_R_factor_all          0.0575
_refine_ls_R_factor_gt           0.0544
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0311P)^2^+6.1451P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1142
_refine_ls_wR_factor_ref         0.1158
_reflns_number_gt                1913
_reflns_number_total             2018
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b818309k.txt
_cod_data_source_block           r2garcix
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 
;
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               7200568
_exptl_absorpt_correction_t_ave  0.1571