1,2,3,4,5,6,7,8-Octahydro-3,3,6,6-tetramethylacridine-1,8-dione
R. Sankaranarayanan; S. Shanmuga Sundara Raj; D. Velmurugan; Hoong-Kun Fun; Acta Crystallographica Section C 55 (1999) 1513–1514; doi:10.1107/S0108270199006149

data_2008897
_publ_section_title
;
 1,2,3,4,5,6,7,8-Octahydro-3,3,6,6-tetramethylacridine-1,8-dione
;
_journal_issue                   9
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              1513
_journal_page_last               1514
_journal_paper_doi               10.1107/S0108270199006149
_journal_volume                  55
_journal_year                    1999
_chemical_formula_sum            'C17 H21 N O2'
_chemical_formula_weight         271.35
_chemical_name_systematic
;
1,2,3,4,5,6,7,8-Octahydro-3,3,6,6-tetramethylacridine-1,8-dione
;
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_audit_creation_method           SHELXL97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   6.9887(2)
_cell_length_b                   10.7123(2)
_cell_length_c                   20.4198(4)
_cell_measurement_reflns_used    39
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      12.51
_cell_measurement_theta_min      5.38
_cell_volume                     1528.73(6)
_computing_cell_refinement       XSCANS
_computing_data_collection       'XSCANS (Siemens, 1994)'
_computing_data_reduction        XSCANS
_computing_molecular_graphics    'ZORTEP (Zsolnai, 1997)'
_computing_publication_material  'SHELXL97 and PARST (Nardelli, 1983b, 1995)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997b)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1997a)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Siemens P4'
_diffrn_measurement_method       \w/2\q
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.047
_diffrn_reflns_av_sigmaI/netI    0.038
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            9982
_diffrn_reflns_theta_full        27.49
_diffrn_reflns_theta_max         27.49
_diffrn_reflns_theta_min         2.76
_diffrn_standards_decay_%        <3
_diffrn_standards_interval_count 97
_diffrn_standards_interval_time  60
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.077
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            'pale yellow'
_exptl_crystal_density_diffrn    1.179
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       'rectangular prism'
_exptl_crystal_F_000             584
_exptl_crystal_size_max          0.45
_exptl_crystal_size_mid          0.38
_exptl_crystal_size_min          0.29
_refine_diff_density_max         0.14
_refine_diff_density_min         -0.17
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.094
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     181
_refine_ls_number_reflns         2024
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.094
_refine_ls_R_factor_all          0.078
_refine_ls_R_factor_gt           0.051
_refine_ls_shift/su_max          <0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w = 1/[\s^2^(Fo^2^)+(0.0394P)^2^+0.3749P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_ref         0.118
_reflns_number_gt                1501
_reflns_number_total             2024
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            fr1186.cif
_cod_data_source_block           anishyd4
_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 

The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc w =
1/[\s^2^(Fo^2^)+(0.0394P)^2^+0.3749P] where P=(Fo^2^+2Fc^2^)/3' was
changed to 'calc'. New tag '_refine_ls_weighting_details' was
created. The value of the new tag was set to 'w =
1/[\s^2^(Fo^2^)+(0.0394P)^2^+0.3749P] where P=(Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_database_code               2008897