Piperazinium dichromate(VI)
Srinivasan, Bikshandarkoil R.; Naik, Ashish R.; Näther, Christian; Bensch, Wolfgang; Acta Crystallographica Section E 60 (2004) m1384–m1386; doi:10.1107/S1600536804021543

data_2204268
_publ_section_title
;
 Piperazinium dichromate(VI)
;
_journal_issue                   10
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              m1384
_journal_page_last               m1386
_journal_paper_doi               10.1107/S1600536804021543
_journal_volume                  60
_journal_year                    2004
_chemical_formula_iupac          '(C4 H12 N2) [Cr2 O7]'
_chemical_formula_moiety         'C4 H12 N2 2+, O7 Cr2 2-'
_chemical_formula_sum            'C4 H12 Cr2 N2 O7'
_chemical_formula_weight         304.16
_chemical_name_common            'Piperazinium dichromate(VI)'
_chemical_name_systematic
;
Piperazinium dichromate(VI)
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 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                 93.420(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   11.654(2)
_cell_length_b                   7.8702(6)
_cell_length_c                   10.855(2)
_cell_measurement_reflns_used    86
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      38
_cell_measurement_theta_min      26
_cell_volume                     993.8(3)
_computing_cell_refinement       DIF4
_computing_data_collection       'DIF4 (Stoe & Cie, 1992)'
_computing_data_reduction        'REDU4 (Stoe & Cie, 1992)'
_computing_molecular_graphics    'XP in SHELXTL (Bruker, 1998)'
_computing_publication_material  'CIFTAB in SHELXTL'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Stoe AED-II four-circle'
_diffrn_measurement_method       \w--\q
_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  0.0331
_diffrn_reflns_av_sigmaI/netI    0.0278
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -2
_diffrn_reflns_limit_l_max       0
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            3793
_diffrn_reflns_theta_full        30.03
_diffrn_reflns_theta_max         30.03
_diffrn_reflns_theta_min         1.75
_diffrn_standards_decay_%        0
_diffrn_standards_interval_time  120
_diffrn_standards_number         4
_exptl_absorpt_coefficient_mu    2.206
_exptl_absorpt_correction_T_max  0.860
_exptl_absorpt_correction_T_min  0.755
_exptl_absorpt_correction_type   numerical
_exptl_absorpt_process_details   '(X-SHAPE; Stoe & Cie, 1998)'
_exptl_crystal_colour            orange
_exptl_crystal_density_diffrn    2.033
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             616
_exptl_crystal_size_max          0.13
_exptl_crystal_size_mid          0.11
_exptl_crystal_size_min          0.07
_refine_diff_density_max         0.507
_refine_diff_density_min         -0.623
_refine_ls_extinction_coef       0.0126(13)
_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   1.070
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     137
_refine_ls_number_reflns         2901
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.070
_refine_ls_R_factor_all          0.0368
_refine_ls_R_factor_gt           0.0263
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w = 1/[\s^2^(Fo^2^)+(0.044P)^2^+0.3618P] where P = (Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0742
_refine_ls_wR_factor_ref         0.0778
_reflns_number_gt                2459
_reflns_number_total             2901
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            bt6511.cif
_cod_data_source_block           I
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2204268