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_7200565
_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_moiety         'C12 H12 N2 O7'
_chemical_formula_sum            'C12 H12 N2 O7'
_chemical_formula_weight         296.24
_chemical_name_common
;N-(2-hydroxyethyl)-6-nitro-2-oxo-2H-chromene-3-carboxamide
hydrate
;
_chemical_name_systematic
;
N-(2-hydroxyethyl)-6-nitro-2-oxo-2H-chromene-3-carboxamide hydrate
;
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                94.044(4)
_cell_angle_beta                 91.533(4)
_cell_angle_gamma                90.092(4)
_cell_formula_units_Z            2
_cell_length_a                   5.0399(13)
_cell_length_b                   8.901(2)
_cell_length_c                   14.031(4)
_cell_measurement_reflns_used    600
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      25
_cell_measurement_theta_min      20
_cell_volume                     627.6(3)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_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  0.0240
_diffrn_reflns_av_sigmaI/netI    0.0266
_diffrn_reflns_limit_h_max       5
_diffrn_reflns_limit_h_min       -5
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            6037
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         1.46
_exptl_absorpt_coefficient_mu    0.131
_exptl_absorpt_correction_T_max  0.8620
_exptl_absorpt_correction_T_min  0.8614
_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    1.568
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             308
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.25
_exptl_crystal_size_min          0.20
_exptl_crystal_size_rad          0.2000
_refine_diff_density_max         0.202
_refine_diff_density_min         -0.213
_refine_diff_density_rms         0.042
_refine_ls_extinction_coef       0.030(7)
_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   1.243
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     191
_refine_ls_number_reflns         2179
_refine_ls_number_restraints     4
_refine_ls_restrained_S_all      1.243
_refine_ls_R_factor_all          0.0602
_refine_ls_R_factor_gt           0.0537
_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^)+(0.0493P)^2^+0.2307P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1267
_refine_ls_wR_factor_ref         0.1304
_reflns_number_gt                1958
_reflns_number_total             2179
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b818309k.txt
_cod_data_source_block           m3mendm
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Triclinic' changed to 'triclinic'
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_database_code               7200565
_exptl_absorpt_correction_t_ave  0.8617