Water Bridged Assembly and Dimer Formation in Co-Crystals of Caffeine or Theophylline with Polycarboxylic Acids
Das, Babulal; Baruah, Jubaraj B.; Crystal Growth & Design 11 (2011) 278–286; doi:10.1021/cg1012846

data_4500221
_publ_section_title
;
 Water Bridged Assembly and Dimer Formation in Co-Crystals of Caffeine or
 Theophylline with Polycarboxylic Acids
;
_journal_coden_ASTM              CGDEFU
_journal_issue                   1
_journal_name_full               'Crystal Growth & Design'
_journal_page_first              278
_journal_page_last               286
_journal_paper_doi               10.1021/cg1012846
_journal_volume                  11
_journal_year                    2011
_chemical_formula_sum            'C12 H14 N6 O7'
_chemical_formula_weight         354.29
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_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                97.385(4)
_cell_angle_beta                 95.162(3)
_cell_angle_gamma                107.772(3)
_cell_formula_units_Z            4
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_cell_length_b                   9.7027(5)
_cell_length_c                   20.4351(11)
_cell_measurement_reflns_used    4116
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      23.02
_cell_measurement_theta_min      2.30
_cell_volume                     1518.43(15)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.951
_diffrn_measured_fraction_theta_max 0.951
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
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_diffrn_reflns_av_sigmaI/netI    0.0398
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_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            19359
_diffrn_reflns_theta_full        24.50
_diffrn_reflns_theta_max         24.50
_diffrn_reflns_theta_min         1.01
_exptl_absorpt_coefficient_mu    0.130
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.550
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plates
_exptl_crystal_F_000             736
_exptl_crystal_size_max          0.28
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_refine_diff_density_max         0.241
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_refine_ls_number_reflns         4806
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_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^)+(0.1000P)^2^+0.7448P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1159
_refine_ls_wR_factor_ref         0.1418
_reflns_number_gt                3312
_reflns_number_total             4806
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            cg1012846_si_003.cif
_cod_data_source_block           35-pyzdca-theo
_cod_depositor_comments
;
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.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      P-1
_cod_database_code               4500221