4-Acetylpyridinium perchlorate
Fu, Xue-qun; Acta Crystallographica Section E 65 (2009) o1804–; doi:10.1107/S1600536809024805

data_2222706
_publ_section_title
;
 4-Acetylpyridinium perchlorate
;
_journal_coeditor_code           HB5018
_journal_issue                   8
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o1804
_journal_paper_doi               10.1107/S1600536809024805
_journal_volume                  65
_journal_year                    2009
_chemical_formula_iupac          'C7 H8 N O +, Cl O4 -'
_chemical_formula_moiety         'C7 H8 N O +, Cl O4 -'
_chemical_formula_sum            'C7 H8 Cl N O5'
_chemical_formula_weight         221.59
_chemical_name_systematic
;
4-Acetylpyridinium perchlorate
;
_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                 97.88(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   5.4657(11)
_cell_length_b                   12.621(3)
_cell_length_c                   13.490(3)
_cell_measurement_reflns_used    4087
_cell_measurement_temperature    298(2)
_cell_measurement_theta_max      27.625
_cell_measurement_theta_min      3.05
_cell_volume                     921.8(4)
_computing_cell_refinement       'CrystalClear (Rigaku, 2005)'
_computing_data_collection       'CrystalClear (Rigaku, 2005)'
_computing_data_reduction        'CrystalClear (Rigaku, 2005)'
_computing_molecular_graphics    'SHELXTL (Sheldrick, 2008)'
_computing_publication_material  'SHELXTL (Sheldrick, 2008)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      298(2)
_diffrn_detector_area_resol_mean 13.6612
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Rigaku SCXmini'
_diffrn_measurement_method       \w
_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  0.0492
_diffrn_reflns_av_sigmaI/netI    0.0386
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            9446
_diffrn_reflns_theta_full        27.48
_diffrn_reflns_theta_max         27.48
_diffrn_reflns_theta_min         3.05
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.410
_exptl_absorpt_correction_T_max  0.921
_exptl_absorpt_correction_T_min  0.921
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(CrystalClear; Rigaku, 2005)'
_exptl_crystal_colour            Colourless
_exptl_crystal_density_diffrn    1.597
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Prism
_exptl_crystal_F_000             456
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.647
_refine_diff_density_min         -0.897
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.056
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     127
_refine_ls_number_reflns         2108
_refine_ls_number_restraints     7
_refine_ls_restrained_S_all      1.317
_refine_ls_R_factor_all          0.0787
_refine_ls_R_factor_gt           0.0619
_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^)+(0.0688P)^2^+0.9865P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1564
_refine_ls_wR_factor_ref         0.1671
_reflns_number_gt                1619
_reflns_number_total             2108
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            hb5018.cif
_cod_data_source_block           I
_cod_depositor_comments
;
The following automatic conversions were performed:
'_exptl_absorpt_correction_type' value 'Multi-scan' changed to
'multi-scan' 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:

'_exptl_absorpt_correction_type' value 'Multi-scan' changed to
'multi-scan' 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_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2222706
_cod_database_fobs_code          2222706