Co-crystals of caffeine and piracetam with 4-hydroxybenzoic acid: Unravelling the hidden hydrates of 1 : 1 co-crystals
Aitipamula, Srinivasulu; Chow, Pui Shan; Tan, Reginald B. H.; CrystEngComm 14 (2012) 2381–; doi:10.1039/c2ce25080b

data_7207674
_publ_section_title
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 Co-crystals of caffeine and piracetam with 4-hydroxybenzoic acid:
 Unravelling the hidden hydrates of 1&#x2009;:&#x2009;1 co-crystals
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_journal_issue                   7
_journal_name_full               CrystEngComm
_journal_page_first              2381
_journal_paper_doi               10.1039/c2ce25080b
_journal_volume                  14
_journal_year                    2012
_chemical_formula_sum            'C15 H18 N4 O6'
_chemical_formula_weight         350.33
_chemical_name_common            'MOnohydrate of caffeine-4HBA (1:1)'
_chemical_name_systematic        'MOnohydrate of caffeine-4HBA (1:1)'
_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
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.33(3)
_cell_angle_beta                 101.29(3)
_cell_angle_gamma                107.57(3)
_cell_formula_units_Z            2
_cell_length_a                   7.2188(14)
_cell_length_b                   8.5282(17)
_cell_length_c                   13.827(3)
_cell_measurement_reflns_used    1907
_cell_measurement_temperature    110(2)
_cell_measurement_theta_max      30.8977
_cell_measurement_theta_min      2.5112
_cell_volume                     793.9(3)
_computing_cell_refinement       'CrystalClear (Rigaku Inc., 2007)'
_computing_data_collection       'CrystalClear (Rigaku Inc., 2007)'
_computing_data_reduction        'CrystalClear (Rigaku Inc., 2007)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      110(2)
_diffrn_measured_fraction_theta_full 0.990
_diffrn_measured_fraction_theta_max 0.990
_diffrn_measurement_device_type  'Rigaku Saturn 70 CCD area detector'
_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  0.0274
_diffrn_reflns_av_sigmaI/netI    0.0295
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            12024
_diffrn_reflns_theta_full        28.28
_diffrn_reflns_theta_max         28.28
_diffrn_reflns_theta_min         1.51
_exptl_absorpt_coefficient_mu    0.115
_exptl_absorpt_correction_T_max  0.9863
_exptl_absorpt_correction_T_min  0.9511
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'R. H. Blessing, Acta Cryst. 1995 A51, 33-38'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.466
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             368
_exptl_crystal_size_max          0.44
_exptl_crystal_size_mid          0.22
_exptl_crystal_size_min          0.12
_refine_diff_density_max         0.246
_refine_diff_density_min         -0.235
_refine_diff_density_rms         0.054
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.139
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     245
_refine_ls_number_reflns         3907
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.139
_refine_ls_R_factor_all          0.0658
_refine_ls_R_factor_gt           0.0581
_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^)+(0.0543P)^2^+0.4144P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1300
_refine_ls_wR_factor_ref         0.1365
_reflns_number_gt                3511
_reflns_number_total             3907
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c2ce25080b.txt
_cod_data_source_block           CAF-HBA
_cod_depositor_comments
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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.

'_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 
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_cod_database_code               7207674