Conformational isomerism in 3-(<i>Z</i>)-isobutylidene-1-acetylpiperazine-2,5-dione
Wendy A. Loughlin; Michelle A. McCleary; Peter C. Healy; Acta Crystallographica Section E 59 (2003) o1807–o1809; doi:10.1107/S1600536803023729

data_2202881
_publ_section_title
;
 Conformational isomerism in
 3-(<i>Z</i>)-isobutylidene-1-acetylpiperazine-2,5-dione
;
_journal_issue                   11
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o1807
_journal_page_last               o1809
_journal_paper_doi               10.1107/S1600536803023729
_journal_volume                  59
_journal_year                    2003
_chemical_formula_iupac          'C10 H14 N2 O3'
_chemical_formula_moiety         'C10 H14 N2 O3'
_chemical_formula_sum            'C10 H14 N2 O3'
_chemical_formula_weight         210.23
_chemical_name_systematic
;
3-(Z)-isobutylidene-1-acetylpiperazine-2,5-dione
;
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                95.607(17)
_cell_angle_beta                 94.680(13)
_cell_angle_gamma                76.484(17)
_cell_formula_units_Z            4
_cell_length_a                   10.7310(18)
_cell_length_b                   10.827(3)
_cell_length_c                   9.7916(14)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    295
_cell_measurement_theta_max      20.0
_cell_measurement_theta_min      19.4
_cell_volume                     1098.8(4)
_computing_cell_refinement       'MSC/AFC7 Diffractometer Control Software'
_computing_data_collection
;
MSC/AFC7 Diffractometer Control Software
(Molecular Structure Corporation, 1999)
;
_computing_data_reduction
'TEXSAN for Windows (Molecular Structure Corporation, 1997-2001)'
_computing_molecular_graphics
'PLATON (Spek, 1980-2001) and ORTEP-3 (Farrugia, 1997)'
_computing_publication_material  'TEXSAN for Windows and PLATON'
_computing_structure_refinement
'TEXSAN for Windows and SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'TEXSAN for Windows'
_diffrn_ambient_temperature      295
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device       'Rigaku AFC-7R'
_diffrn_measurement_method       \w--2/q
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'Rigaku rotating anode'
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71069
_diffrn_reflns_av_R_equivalents  0.0191
_diffrn_reflns_av_sigmaI/netI    0.0279
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       11
_diffrn_reflns_limit_l_min       -11
_diffrn_reflns_number            4100
_diffrn_reflns_reduction_process ' ?'
_diffrn_reflns_theta_full        25.02
_diffrn_reflns_theta_max         25.02
_diffrn_reflns_theta_min         2.09
_diffrn_standards_decay_%        1.27
_diffrn_standards_interval_count 150
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.095
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.271
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             448
_exptl_crystal_size_max          0.600
_exptl_crystal_size_mid          0.500
_exptl_crystal_size_min          0.300
_refine_diff_density_max         0.261
_refine_diff_density_min         -0.264
_refine_ls_extinction_coef       0.032(7)
_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   1.085
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     272
_refine_ls_number_reflns         3872
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.085
_refine_ls_R_factor_all          0.0799
_refine_ls_R_factor_gt           0.0532
_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^)+(0.1241P)^2^+0.0666P] where P = (Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1649
_refine_ls_wR_factor_ref         0.1876
_reflns_number_gt                2691
_reflns_number_total             3872
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            rn6001.cif
_cod_data_source_block           I
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Triclinic' changed to 'triclinic'
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 'Triclinic' changed to 'triclinic'
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               2202881
_cod_database_fobs_code          2202881