Polymorphism and hydrogen bonding in cinchomeronic acid: a variable temperature experimental and computational study
Evans, Ivana Radosavljevic; Howard, Judith A. K.; Evans, John S. O.; Postlethwaite, Stella R.; Johnson, Mark R.; CrystEngComm 10 (2008) 1404–; doi:10.1039/b807015f

data_7202218
_publ_section_title
;
 Polymorphism and hydrogen bonding in cinchomeronic acid: a variable
 temperature experimental and computational study
;
_journal_issue                   10
_journal_name_full               CrystEngComm
_journal_page_first              1404
_journal_paper_doi               10.1039/b807015f
_journal_volume                  10
_journal_year                    2008
_chemical_absolute_configuration unk
_chemical_formula_moiety         'C7 H5 N O4'
_chemical_formula_sum            'C7 H5 N O4'
_chemical_formula_weight         167.12
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_audit_creation_date             07-11-09
_audit_creation_method           CRYSTALS_ver_12.84
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   5.260(2)
_cell_length_b                   11.201(5)
_cell_length_c                   11.275(5)
_cell_measurement_reflns_used    0
_cell_measurement_temperature    293
_cell_measurement_theta_max      0
_cell_measurement_theta_min      0
_cell_volume                     664.3(5)
_computing_cell_refinement       'USER DEFINED CELL REFINEMENT'
_computing_data_collection       'USER DEFINED DATA COLLECTION'
_computing_data_reduction        'USER DEFINED DATA REDUCTION'
_computing_molecular_graphics    'CAMERON (Watkin et al., 1996)'
_computing_publication_material  'CRYSTALS (Betteridge et al., 2003)'
_computing_structure_refinement  'CRYSTALS (Betteridge et al., 2003)'
_computing_structure_solution    'SIR92 (Altomare et al., 1994)'
_diffrn_ambient_temperature      293
_diffrn_measured_fraction_theta_full 0.992
_diffrn_measured_fraction_theta_max 0.978
_diffrn_measurement_device_type  Unknown
_diffrn_measurement_method       \w/2\q
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.031
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            5249
_diffrn_reflns_theta_full        25.788
_diffrn_reflns_theta_max         29.986
_diffrn_reflns_theta_min         3.614
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.140
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  1.0000
_exptl_absorpt_correction_type   none
_exptl_crystal_density_diffrn    1.671
_exptl_crystal_F_000             344
_refine_diff_density_max         0.19
_refine_diff_density_min         -0.17
_refine_ls_extinction_coef       12(5)
_refine_ls_extinction_method     'Larson (1970), Equation 22'
_refine_ls_goodness_of_fit_ref   0.8776
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     130
_refine_ls_number_reflns         1390
_refine_ls_number_restraints     0
_refine_ls_R_factor_all          0.0423
_refine_ls_R_factor_gt           0.0323
_refine_ls_shift/su_max          0.000251
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
;
Method, part 1, Chebychev polynomial, (Watkin, 1994, Prince, 1982)
[weight] = 1.0/[A~0~*T~0~(x)+A~1~*T~1~(x) ... +A~n-1~]*T~n-1~(x)]
where A~i~ are the Chebychev coefficients listed below and x= Fcalc/Fmax
Method = Robust Weighting (Prince, 1982)
W = [weight] * [1-(deltaF/6*sigmaF)^2^]^2^
A~i~ are:
2.33 2.93 0.930
;
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.0660
_refine_ls_wR_factor_gt          0.0643
_refine_ls_wR_factor_ref         0.0643
_reflns_limit_h_max              7
_reflns_limit_h_min              -7
_reflns_limit_k_max              15
_reflns_limit_k_min              0
_reflns_limit_l_max              15
_reflns_limit_l_min              0
_reflns_number_gt                1390
_reflns_number_total             1907
_reflns_threshold_expression     I>2.0\s(I)
_oxford_diffrn_Wilson_B_factor   0.00
_oxford_diffrn_Wilson_scale      0.00
_oxford_refine_ls_scale          0.4083(7)
_oxford_structure_analysis_title '400sad in P2(1)2(1)2(1)'
_cod_data_source_file            b807015f.txt
_cod_data_source_block           CRYSTALS_cifIV
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Orthorhombic' changed to 'orthorhombic'
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 

2018-03-04
Z value and formula fixed to values more according to usual
chemical conventions.                 miguel
;
_cod_original_formula_sum            'C28 H20 N4 O16'
_cod_original_formula_weight         668.48
_cod_original_formula_moiety         'C28 H20 N4 O16'
_cod_original_formula_units_Z            1
_cod_original_sg_symbol_H-M      'P 21 21 21 '
_cod_database_code               7202218