Organic Crystal Engineering with 1,4-Piperazine-2,5-diones. 8. Synthesis, Crystal Packing, and Thermochemistry of Piperazinediones Derived from 2-Amino-4,7-dialkoxyindan-2-carboxylic Acids
Wells, Kirk E.; Weatherhead, Robin A.; Murigi, Francis N.; Nichol, Gary S.; Carducci, Michael D.; Selby, Hugh D.; Mash, Eugene A.; Crystal Growth & Design 12 (2012) 5056–; doi:10.1021/cg301003p

data_4506858
_publ_section_title
;
 Organic Crystal Engineering with 1,4-Piperazine-2,5-diones. 8. Synthesis,
 Crystal Packing, and Thermochemistry of Piperazinediones Derived from
 2-Amino-4,7-dialkoxyindan-2-carboxylic Acids
;
_journal_issue                   10
_journal_name_full               'Crystal Growth &amp; Design'
_journal_page_first              5056
_journal_paper_doi               10.1021/cg301003p
_journal_volume                  12
_journal_year                    2012
_chemical_formula_moiety         'C28 H34 N2 O6'
_chemical_formula_sum            'C28 H34 N2 O6'
_chemical_formula_weight         494.57
_chemical_name_common            C2-tail
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      14
_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                 91.328(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   9.8429(13)
_cell_length_b                   6.1190(8)
_cell_length_c                   21.635(3)
_cell_measurement_reflns_used    4815
_cell_measurement_temperature    170(2)
_cell_measurement_theta_max      26.7515
_cell_measurement_theta_min      2.254
_cell_volume                     1302.7(3)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      170(2)
_diffrn_measured_fraction_theta_full 0.958
_diffrn_measured_fraction_theta_max 0.958
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_measurement_specimen_support 'glass fiber'
_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  0.0344
_diffrn_reflns_av_sigmaI/netI    0.0324
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_limit_l_min       -27
_diffrn_reflns_number            12750
_diffrn_reflns_theta_full        26.85
_diffrn_reflns_theta_max         26.85
_diffrn_reflns_theta_min         1.88
_diffrn_standards_decay_%        0.28
_diffrn_standards_interval_count 1818
_diffrn_standards_number         66
_exptl_absorpt_coefficient_mu    0.089
_exptl_absorpt_correction_T_max  1.0
_exptl_absorpt_correction_T_min  0.955517
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Bruker, 1997)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.261
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             528
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.299
_refine_diff_density_min         -0.212
_refine_diff_density_rms         0.044
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.047
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_constraints    0
_refine_ls_number_parameters     168
_refine_ls_number_reflns         2691
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.047
_refine_ls_R_factor_all          0.0701
_refine_ls_R_factor_gt           0.0423
_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^)+(0.0412P)^2^+0.5387P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0917
_refine_ls_wR_factor_ref         0.1049
_reflns_number_gt                1900
_reflns_number_total             2691
_reflns_threshold_expression     I>2sigma(I)
_cod_data_source_file            cg301003p_si_002.cif
_cod_data_source_block           kw04s
_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 1891 2012-01-12 08:04:46Z andrius 
;
_cod_original_sg_symbol_H-M      P2(1)/n
_cod_database_code               4506858