Multiple hydrogen bonds and tautomerism in naphthyridine derivatives
Carmen Alvarez-Rua; Santiago García-Granda; Shyamaprosad Goswami; Reshmi Mukherjee; Swapan Dey; Rosa M. Claramunt; M. Dolores Santa María; Isabel Rozas; Nadine Jagerovic; Ibon Alkorta; José Elguero; New J. Chem. 28 (2004) 700–707; doi:10.1039/b315692c

data_7050273
_publ_section_title
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 Multiple hydrogen bonds and tautomerism in naphthyridine derivatives
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_journal_issue                   6
_journal_name_full               'New J. Chem.'
_journal_page_first              700
_journal_page_last               707
_journal_paper_doi               10.1039/b315692c
_journal_volume                  28
_journal_year                    2004
_chemical_formula_moiety         'C10 H10 N4 O'
_chemical_formula_sum            'C10 H10 N4 O'
_chemical_formula_weight         202.22
_space_group_IT_number           43
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'F 2 -2d'
_symmetry_space_group_name_H-M   'F d d 2'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            16
_cell_length_a                   19.001(3)
_cell_length_b                   25.829(8)
_cell_length_c                   7.844(2)
_cell_measurement_reflns_used    1432
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      68.14
_cell_measurement_theta_min      5.78
_cell_volume                     3849.7(17)
_computing_cell_refinement       'HKL SCALEPACK (Otwinowski & Minor, 1997)'
_computing_data_collection       'COLLECT (Nonius BV, 1997-2000)'
_computing_data_reduction
'HKL DENZO and SCALEPACK (Otwinowski & Minor, 1997)'
_computing_molecular_graphics    'PLATON (Spek, 2001)'
_computing_publication_material  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_detector_area_resol_mean 9
_diffrn_measured_fraction_theta_full 0.833
_diffrn_measured_fraction_theta_max 0.834
_diffrn_measurement_device       '95mm CCD camera on \k-goniostat'
_diffrn_measurement_device_type  KappaCCD
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  'horizontally mounted graphite crystal'
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.5418
_diffrn_reflns_av_R_equivalents  0.0712
_diffrn_reflns_av_sigmaI/netI    0.0974
_diffrn_reflns_limit_h_max       21
_diffrn_reflns_limit_h_min       -22
_diffrn_reflns_limit_k_max       30
_diffrn_reflns_limit_k_min       -28
_diffrn_reflns_limit_l_max       9
_diffrn_reflns_limit_l_min       -9
_diffrn_reflns_number            2690
_diffrn_reflns_theta_full        68.14
_diffrn_reflns_theta_max         68.14
_diffrn_reflns_theta_min         5.78
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.790
_exptl_absorpt_correction_type   none
_exptl_absorpt_process_details   'Sortav (Blessing, 1995)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.396
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             1696
_exptl_crystal_size_max          0.15
_exptl_crystal_size_mid          0.08
_exptl_crystal_size_min          0.03
_refine_diff_density_max         0.189
_refine_diff_density_min         -0.245
_refine_diff_density_rms         0.068
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.5(6)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.950
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     142
_refine_ls_number_reflns         1431
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      0.950
_refine_ls_R_factor_all          0.0850
_refine_ls_R_factor_gt           0.0482
_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^)+(0.0451P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0994
_refine_ls_wR_factor_ref         0.1184
_reflns_number_gt                938
_reflns_number_total             1431
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b315692c.txt
_cod_data_source_block           3a
_cod_depositor_comments
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The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Orthorhombic' changed to 'orthorhombic'
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 
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_cod_database_code               7050273