6-Methyl-11<i>a</i>,12-dihydro-6<i>H</i>-quino[3,2-<i>b</i>][1,4]benzothiazine: an amidine formed under unusual conditions
Luck, Rudy L.; Li, Kexue; Bates, Dallas K.; Acta Crystallographica Section E 59 (2003) o302–o303; doi:10.1107/S1600536803002988

data_2201982
_publ_section_title
;6-Methyl-11<i>a</i>,12-dihydro-6<i>H</i>-quino[3,2-<i>b</i>][1,4]benzothiazine:
 an amidine formed under unusual conditions
;
_journal_issue                   3
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o302
_journal_page_last               o303
_journal_paper_doi               10.1107/S1600536803002988
_journal_volume                  59
_journal_year                    2003
_chemical_formula_iupac          'C16 H14 N2 S1'
_chemical_formula_moiety         'C16 H14 N2 S1'
_chemical_formula_sum            'C16 H14 N2 S'
_chemical_formula_weight         266.35
_space_group_IT_number           29
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2c -2ac'
_symmetry_space_group_name_H-M   'P c a 21'
_audit_creation_method           'WinGX routine CIF_UPDATE'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   22.775(4)
_cell_length_b                   5.3810(10)
_cell_length_c                   10.587(2)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      25
_cell_measurement_theta_min      10
_cell_volume                     1297.5(4)
_computing_cell_refinement       'CAD-4 EXPRESS'
_computing_data_collection       'CAD-4 EXPRESS (Enraf--Nonius, 1994)'
_computing_data_reduction        'XCAD4 (Harms & Wocadlo, 1995)'
_computing_molecular_graphics    'ORTEP-3 for Windows (Farrugia, 1997)'
_computing_publication_material  'WinGX (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SIR97 (Altomare et al., 1999)'
_diffrn_measured_fraction_theta_full 1
_diffrn_measured_fraction_theta_max 1
_diffrn_measurement_device       '\k-geometry diffractometer'
_diffrn_measurement_device_type  'Enraf--Nonius TurboCAD-4'
_diffrn_measurement_method       'non-profiled \w'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0186
_diffrn_reflns_limit_h_max       27
_diffrn_reflns_limit_h_min       -1
_diffrn_reflns_limit_k_max       6
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            1274
_diffrn_reflns_theta_full        24.98
_diffrn_reflns_theta_max         24.98
_diffrn_reflns_theta_min         1.79
_diffrn_standards_decay_%        1
_diffrn_standards_interval_time  120
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.236
_exptl_absorpt_correction_T_max  0.9767
_exptl_absorpt_correction_T_min  0.9537
_exptl_absorpt_correction_type   psi-scan
_exptl_absorpt_process_details   '(North, Phillips & Mathews, 1968)'
_exptl_crystal_colour            white
_exptl_crystal_density_diffrn    1.364
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       irregular
_exptl_crystal_F_000             560
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.16
_refine_diff_density_min         -0.20
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.069
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     172
_refine_ls_number_reflns         1214
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.068
_refine_ls_R_factor_gt           0.041
_refine_ls_shift/su_max          0
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w = 1/[\s^2^(Fo^2^)+(0.0457P)^2^] where P = (Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_ref         0.099
_reflns_number_gt                844
_reflns_number_total             1214
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            fl6017.cif
_cod_data_source_block           4
_cod_database_code               2201982
_cod_database_fobs_code          2201982