Colorimetric detection of thiols using a chromene molecule
Huo, Fang-Jun; Sun, Yuan-Qiang; Su, Jing; Chao, Jian-Bin; Zhi, Hai-Juan; Yin, Cai-Xia; Organic letters 11 (2009) 4918–4921; doi:10.1021/ol901951h

data_1504211
_publ_section_title
;
 Colorimetric detection of thiols using a chromene molecule
;
_journal_issue                   21
_journal_name_full               'Organic letters'
_journal_page_first              4918
_journal_page_last               4921
_journal_paper_doi               10.1021/ol901951h
_journal_volume                  11
_journal_year                    2009
_chemical_formula_moiety         'C12 H9 N O4'
_chemical_formula_sum            'C12 H9 N O4'
_chemical_formula_weight         231.20
_chemical_name_common
;
 7-nitro-2, 3-dihydro-1H-cyclopenta[b]chromen-1-one
;
_chemical_name_systematic
;
 7-nitro-2, 3-dihydro-1H-cyclopenta[b]chromen-1-one
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 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                 98.257(4)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   6.0584(11)
_cell_length_b                   19.717(4)
_cell_length_c                   8.9513(16)
_cell_measurement_reflns_used    6400
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      22.36
_cell_measurement_theta_min      2.52
_cell_volume                     1058.2(3)
_computing_cell_refinement       'SAINT (Bruker, 2000)'
_computing_data_collection       'SMART (Bruker, 2000)'
_computing_data_reduction        SAINT
_computing_molecular_graphics    'SHELXTL (Bruker, 1999)'
_computing_publication_material  SHELXTL
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2000)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 2000)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.992
_diffrn_measured_fraction_theta_max 0.992
_diffrn_measurement_device_type  'Bruker SMART CCD area-detector'
_diffrn_measurement_method       \w
_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  0.0643
_diffrn_reflns_av_sigmaI/netI    0.0669
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       20
_diffrn_reflns_limit_k_min       -23
_diffrn_reflns_limit_l_max       9
_diffrn_reflns_limit_l_min       -10
_diffrn_reflns_number            4356
_diffrn_reflns_theta_full        25.01
_diffrn_reflns_theta_max         25.01
_diffrn_reflns_theta_min         2.07
_diffrn_standards_decay_%        2.53
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.111
_exptl_absorpt_correction_T_max  0.989
_exptl_absorpt_correction_T_min  0.978
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Sheldrick, 1996)'
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.451
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             480
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.166
_refine_diff_density_min         -0.178
_refine_diff_density_rms         0.044
_refine_ls_extinction_coef       0.0009(2)
_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   0.978
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     183
_refine_ls_number_reflns         1850
_refine_ls_number_restraints     5
_refine_ls_restrained_S_all      0.977
_refine_ls_R_factor_all          0.0946
_refine_ls_R_factor_gt           0.0524
_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^)+(0.0544P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1081
_refine_ls_wR_factor_ref         0.1247
_reflns_number_gt                1165
_reflns_number_total             1850
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol901951h_si_002.cif
_cod_data_source_block           1
_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 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               1504211