Polymorphism and phase transition behavior of 6,6'-bis(chloromethyl)-1,1',4,4'-tetramethyl-3,3'-(<i>p</i>-phenylenedimethylene)bis(piperazine-2,5-dione)
Polaske, Nathan W.; Nichol, Gary S.; Olenyuk, Bogdan; Acta Crystallographica Section C 65 (2009) o381–o384; doi:10.1107/S0108270109024457

data_2017264
_publ_section_title
;Polymorphism and phase transition behavior of
 6,6'-bis(chloromethyl)-1,1',4,4'-tetramethyl-3,3'-(<i>p</i>-phenylenedimethylene)bis(piperazine-2,5-dione)
;
_journal_coeditor_code           SK3332
_journal_issue                   8
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              o381
_journal_page_last               o384
_journal_paper_doi               10.1107/S0108270109024457
_journal_volume                  65
_journal_year                    2009
_chemical_formula_moiety         'C22 H28 Cl2 N4 O4'
_chemical_formula_sum            'C22 H28 Cl2 N4 O4'
_chemical_formula_weight         483.38
_chemical_name_systematic
;
3,3'-[1,4-phenylene-bis-(methylene)]-bis-[6-(chloromethyl)-
1,4-dimethyl-2,5-piperazinedione]
;
_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   difmap
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 92.123(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   9.2208(13)
_cell_length_b                   12.6517(19)
_cell_length_c                   9.6894(15)
_cell_measurement_reflns_used    1653
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      27.60
_cell_measurement_theta_min      2.65
_cell_volume                     1129.6(3)
_computing_cell_refinement
;
CELL_NOW (Sheldrick, 2004) and SAINT (Bruker, 2007)
;
_computing_data_collection       'APEX2 (Bruker, 2007)'
_computing_data_reduction        'SAINT (Bruker, 2007)'
_computing_molecular_graphics
;
ORTEP3 for Windows (Farrugia, 1997) and Mercury (Macrae <i>et al.</i>,
2008)
;
_computing_publication_material
;
SHELXTL (Sheldrick, 2008), publCIF (Westrip, 2009) and local
programs
;
_computing_structure_refinement  'SHELXTL (Sheldrick, 2008)'
_computing_structure_solution    'SHELXTL (Sheldrick, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.994
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_device_type  'Bruker Kappa APEXII DUO CCD diffractometer'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube with Miracol optics'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0341
_diffrn_reflns_av_sigmaI/netI    0.0354
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            2919
_diffrn_reflns_theta_full        28.33
_diffrn_reflns_theta_max         28.33
_diffrn_reflns_theta_min         2.10
_exptl_absorpt_coefficient_mu    0.325
_exptl_absorpt_correction_T_max  0.745686
_exptl_absorpt_correction_T_min  0.632350
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(TWINABS 2008/2; Sheldrick, 1996)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.421
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             508
_exptl_crystal_size_max          0.19
_exptl_crystal_size_mid          0.16
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.315
_refine_diff_density_min         -0.232
_refine_ls_abs_structure_details 'Flack  (1983)'
_refine_ls_abs_structure_Flack   0.07(7)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.016
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     294
_refine_ls_number_reflns         2919
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.016
_refine_ls_R_factor_all          0.0424
_refine_ls_R_factor_gt           0.0349
_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^)+(0.0515P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0808
_refine_ls_wR_factor_ref         0.0847
_reflns_number_gt                2603
_reflns_number_total             2919
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            sk3332.cif
_cod_data_source_block           2lt
_cod_original_sg_symbol_H-M      'P 21'
_cod_database_code               2017264
_cod_database_fobs_code          2017264