1-Ethyl-4-phenylethyl-1,4-dihydroquinoxaline-2,3-dione
Mehmet Akkurt; Sema Öztürk; Hasan Küçükbay; Ersin Orhan; Orhan Büyükgüngör; Acta Crystallographica Section E 60 (2004) o1266–o1268; doi:10.1107/S1600536804014989

data_2203873
_publ_section_title
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 1-Ethyl-4-phenylethyl-1,4-dihydroquinoxaline-2,3-dione
;
_journal_issue                   7
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o1266
_journal_page_last               o1268
_journal_paper_doi               10.1107/S1600536804014989
_journal_volume                  60
_journal_year                    2004
_chemical_formula_iupac          'C18 H18 N2 O2'
_chemical_formula_moiety         'C18 H18 N2 O2'
_chemical_formula_sum            'C18 H18 N2 O2'
_chemical_formula_weight         294.34
_chemical_name_systematic
;
1-Ethyl-4-phenylethyl-1,4-dihydroquinoxaline-2,3-dione
;
_space_group_IT_number           61
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2ab'
_symmetry_space_group_name_H-M   'P b c a'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   13.369(5)
_cell_length_b                   15.310(5)
_cell_length_c                   14.690(5)
_cell_measurement_reflns_used    6175
_cell_measurement_temperature    293
_cell_measurement_theta_max      25.32
_cell_measurement_theta_min      2.45
_cell_volume                     3006.7(18)
_computing_cell_refinement       X-AREA
_computing_data_collection       'X-AREA (Stoe & Cie, 2002)'
_computing_data_reduction        'X-RED32 (Stoe & Cie, 2002)'
_computing_molecular_graphics    'ORTEP-3 (Farrugia, 1997)'
_computing_publication_material  'WinGX (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SIR97 (Altomare et al., 1999)'
_diffrn_ambient_temperature      293
_diffrn_detector_area_resol_mean 6.67
_diffrn_measured_fraction_theta_full 0.991
_diffrn_measured_fraction_theta_max 0.991
_diffrn_measurement_device_type  'Stoe IPDS-II'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  'plane graphite'
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.1146
_diffrn_reflns_av_sigmaI/netI    0.0901
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            18583
_diffrn_reflns_reduction_process ' ?'
_diffrn_reflns_theta_full        27.27
_diffrn_reflns_theta_max         27.27
_diffrn_reflns_theta_min         2.45
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.086
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.301
_exptl_crystal_density_method    'Not Measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             1248
_exptl_crystal_size_max          0.42
_exptl_crystal_size_mid          0.33
_exptl_crystal_size_min          0.24
_refine_diff_density_max         0.115
_refine_diff_density_min         -0.125
_refine_ls_extinction_coef       0.0021(3)
_refine_ls_extinction_expression FC^*^=KFC[1+0.001XFC^2^\L^3^/SIN(2\Q)]^-1/4^
_refine_ls_extinction_method     SHELXL97
_refine_ls_goodness_of_fit_ref   0.857
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     200
_refine_ls_number_reflns         3351
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.857
_refine_ls_R_factor_all          0.1576
_refine_ls_R_factor_gt           0.0481
_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^)+(0.0269P)^2^] where P = (Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0685
_refine_ls_wR_factor_ref         0.0890
_reflns_number_gt                1328
_reflns_number_total             3351
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            ci6392.cif
_cod_data_source_block           I
_cod_depositor_comments
;
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 

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_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_database_code               2203873