Azaxanthones and azathioxanthones are effective sensitisers for europium and terbium luminescence.
Atkinson, Paul; Findlay, Karen S.; Kielar, Filip; Pal, Robert; Parker, David; Poole, Robert A.; Puschmann, Horst; Richardson, Siobhan L.; Stenson, Philip A.; Thompson, Amber L.; Yu, Junhau; Organic & biomolecular chemistry 4 (2006) 1707–1722; doi:10.1039/b601357k

data_7150440
_publ_section_title
;
 Azaxanthones and azathioxanthones are effective sensitisers for
 europium and terbium luminescence.
;
_journal_issue                   9
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              1707
_journal_page_last               1722
_journal_paper_doi               10.1039/b601357k
_journal_volume                  4
_journal_year                    2006
_chemical_absolute_configuration unk
_chemical_formula_moiety         'C14 H11 N O3'
_chemical_formula_sum            'C14 H11 N O3'
_chemical_formula_weight         241.24
_chemical_melting_point          ?
_chemical_name_common            9-methoxy-2-methyl-1-azaxanthone
_chemical_name_systematic
;
9-methoxy-2-methyl-1-azaxanthone
;
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90.00
_cell_angle_beta                 93.579(4)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   3.8200(6)
_cell_length_b                   9.5681(16)
_cell_length_c                   14.756(2)
_cell_measurement_reflns_used    2114
_cell_measurement_temperature    120(2)
_cell_measurement_theta_max      28.000
_cell_measurement_theta_min      2.539
_cell_volume                     538.28(14)
_computing_cell_refinement       'SMART-NT V6.1 (Bruker, 2000)'
_computing_data_collection       'SMART-NT V6.1 (Bruker, 2000)'
_computing_data_reduction        'SAINT-NT V6.45A (Bruker, 2000)'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'CRYSTALS (Betteridge et al., 2003)'
_computing_structure_refinement  'CRYSTALS (Betteridge et al., 2003)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      120(2)
_diffrn_detector_area_resol_mean 8
_diffrn_measured_fraction_theta_full 0.993
_diffrn_measured_fraction_theta_max 0.981
_diffrn_measurement_device_type  'Bruker ProteumM with Bede Microsource'
_diffrn_measurement_method       \w-scans
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'micro-focus X-ray source'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.027
_diffrn_reflns_limit_h_max       5
_diffrn_reflns_limit_h_min       -5
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            1380
_diffrn_reflns_theta_full        27.424
_diffrn_reflns_theta_max         28.272
_diffrn_reflns_theta_min         2.538
_exptl_absorpt_coefficient_mu    0.106
_exptl_absorpt_correction_T_max  0.9961
_exptl_absorpt_correction_T_min  0.9814
_exptl_absorpt_correction_type   integration
_exptl_absorpt_process_details   'XPREP (SHELXTL,1997)'
_exptl_crystal_colour            'pale yellow'
_exptl_crystal_density_diffrn    1.488
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    .
_exptl_crystal_description       needle
_exptl_crystal_F_000             252
_exptl_crystal_size_max          0.60
_exptl_crystal_size_mid          0.02
_exptl_crystal_size_min          0.02
_refine_diff_density_max         0.20
_refine_diff_density_min         -0.16
_refine_ls_extinction_method     None
_refine_ls_goodness_of_fit_ref   1.0770
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     164
_refine_ls_number_reflns         904
_refine_ls_number_restraints     1
_refine_ls_R_factor_all          0.0487
_refine_ls_R_factor_gt           0.0276
_refine_ls_shift/su_max          0.000103
_refine_ls_structure_factor_coef F
_refine_ls_weighting_details
;
Method, part 1, Chebychev polynomial, (Watkin, 1994, Prince, 1982)
[weight] = 1.0/[A~0~*T~0~(x)+A~1~*T~1~(x) ... +A~n-1~]*T~n-1~(x)]
where A~i~ are the Chebychev coefficients listed below and x= Fcalc/Fmax
Method = Robust Weighting (Prince, 1982)
W = [weight] * [1-(deltaF/6*sigmaF)^2^]^2^
A~i~ are:
0.311 0.196 0.171
;
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.0411
_refine_ls_wR_factor_gt          0.0297
_refine_ls_wR_factor_ref         0.0297
_reflns_number_gt                904
_reflns_number_total             1380
_reflns_threshold_expression     I>3.00u(I)
_oxford_diffrn_Wilson_B_factor   0.00
_oxford_diffrn_Wilson_scale      0.00
_oxford_refine_ls_scale          0.5306(13)
_cod_data_source_file            b601357k.txt
_cod_data_source_block           5b
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to '/home/adriana/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from
2010-06-29.

'_exptl_absorpt_correction_type' value 'Integration' changed
to 'integration' according to
'/home/adriana/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 1555 2011-01-17 13:19:09Z saulius 

The following automatic conversions were performed:

'_chemical_melting_point' value 'not measured' was changed to '?' -
the value is undefined or not given.

Automatic conversion script
Id: cif_fix_values 1569 2011-02-09 13:29:24Z adriana 
;
_cod_original_cell_volume        538.30(15)
_cod_original_sg_symbol_H-M      P2(1)
_cod_database_code               7150440
_refine_ls_r_factor_ref          0.0276