Compressed hydrogen-bond effects in the pressure-frozen chloroacetic acid
Roman Gajda; Andrzej Katrusiak; Acta Crystallographica Section B 63 (2007) 896–902; doi:10.1107/S0108768107037263

data_2102960
_publ_contact_author_fax         +48(61)8658008
_publ_contact_author_phone       +48(61)8291443
_publ_section_title
;
 Compressed hydrogen-bond effects in the pressure-frozen chloroacetic
 acid
;
_journal_coeditor_code           AV5090
_journal_date_accepted           2007-07-30
_journal_date_recd_electronic    2007-06-07
_journal_issue                   6
_journal_name_full               'Acta Crystallographica Section B'
_journal_page_first              896
_journal_page_last               902
_journal_paper_category          FA
_journal_paper_doi               10.1107/S0108768107037263
_journal_volume                  63
_journal_year                    2007
_chemical_formula_moiety         'C2 H2 O2 Cl2'
_chemical_formula_sum            'C2 H2 Cl2 O2'
_chemical_formula_weight         128.94
_chemical_melting_point          283
_chemical_name_systematic
;
 dichloroacetic acid
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_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                 92.89(5)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   4.6404(18)
_cell_length_b                   11.134(7)
_cell_length_c                   8.299(5)
_cell_measurement_reflns_used    1729
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      29.75
_cell_measurement_theta_min      3.06
_cell_volume                     428.2(4)
_computing_cell_refinement       'CrysAlis (Oxford Diffraction, 2003)'
_computing_data_collection       'CrysAlis (Oxford Diffraction, 2003)'
_computing_data_reduction        'CrysAlis (Oxford Diffraction, 2003)'
_computing_molecular_graphics    'XP (Siemens, 1990)'
_computing_publication_material  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.384
_diffrn_measured_fraction_theta_max 0.384
_diffrn_measurement_device_type  'Kuma KM4CCD \k geometry'
_diffrn_measurement_method       '\w scans'
_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  0.0506
_diffrn_reflns_av_sigmaI/netI    0.0298
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -6
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       7
_diffrn_reflns_limit_l_min       -7
_diffrn_reflns_number            2443
_diffrn_reflns_theta_full        29.75
_diffrn_reflns_theta_max         29.75
_diffrn_reflns_theta_min         3.06
_exptl_absorpt_coefficient_mu    1.350
_exptl_absorpt_correction_T_max  0.88
_exptl_absorpt_correction_T_min  0.45
_exptl_absorpt_correction_type   analytical
_exptl_absorpt_process_details
;
Katrusiak, A. (2003). REDSHADE - Program for correcting
reflections intensities for DAC absorption, gasket shadowing
and sample crystal absorption. Adam Mickiewicz University, Pozna\'n.
Katrusiak, A. (2004). Z. Kristallogr. 219, 461-467
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    2.000
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       disc
_exptl_crystal_F_000             256
_exptl_crystal_size_max          0.36
_exptl_crystal_size_mid          0.34
_exptl_crystal_size_min          0.18
_refine_diff_density_max         0.190
_refine_diff_density_min         -0.164
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.301
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     63
_refine_ls_number_reflns         468
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.301
_refine_ls_R_factor_all          0.0664
_refine_ls_R_factor_gt           0.0534
_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^)+(0.0244P)^2^+0.4612P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0880
_refine_ls_wR_factor_ref         0.0914
_reflns_number_gt                409
_reflns_number_total             468
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            av5090.cif
_cod_data_source_block           dichloroacetic_acid_2
_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 2.4.1 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 'Monoclinic' changed to 'monoclinic'
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/n'
_cod_database_code               2102960
_cod_database_fobs_code          2102960