Co-crystals of caffeine with substituted nitroanilines and nitrobenzoic acids: Structure–mechanical property and thermal studies
Ghosh, Soumyajit; Malla Reddy, C.; CrystEngComm 14 (2012) 2444–; doi:10.1039/c2ce06754d

data_7207666
_publ_section_title
;
 Co-crystals of caffeine with substituted nitroanilines and nitrobenzoic
 acids: Structure--mechanical property and thermal studies
;
_journal_issue                   7
_journal_name_full               CrystEngComm
_journal_page_first              2444
_journal_paper_doi               10.1039/c2ce06754d
_journal_volume                  14
_journal_year                    2012
_chemical_formula_moiety         'C7 H4 N2 O6,C8 H10 N4 O2'
_chemical_formula_sum            'C15 H14 N6 O8'
_chemical_formula_weight         406.32
_chemical_melting_point          432.27
_chemical_name_common            Caffeine:2,4dinitrobenzoicacid
_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                88.2690(10)
_cell_angle_beta                 77.0890(10)
_cell_angle_gamma                72.2120(10)
_cell_formula_units_Z            4
_cell_length_a                   8.5624(4)
_cell_length_b                   11.8197(6)
_cell_length_c                   18.7587(10)
_cell_measurement_reflns_used    9935
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      31.60
_cell_measurement_theta_min      2.23
_cell_volume                     1760.53(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 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'BRUKER KAPPA APEX II DUO'
_diffrn_measurement_method       'phi and omega 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  0.0310
_diffrn_reflns_av_sigmaI/netI    0.0250
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            28334
_diffrn_reflns_theta_full        27.00
_diffrn_reflns_theta_max         27.00
_diffrn_reflns_theta_min         1.81
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.127
_exptl_absorpt_correction_T_max  0.991
_exptl_absorpt_correction_T_min  0.963
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'multi-scan absorption correction'
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.533
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             840
_exptl_crystal_size_max          0.56
_exptl_crystal_size_mid          0.25
_exptl_crystal_size_min          0.07
_refine_diff_density_max         0.766
_refine_diff_density_min         -0.620
_refine_diff_density_rms         0.053
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.030
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     545
_refine_ls_number_reflns         7644
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.030
_refine_ls_R_factor_all          0.0714
_refine_ls_R_factor_gt           0.0558
_refine_ls_shift/su_max          0.010
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0744P)^2^+1.2155P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1464
_refine_ls_wR_factor_ref         0.1665
_reflns_number_gt                5914
_reflns_number_total             7644
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c2ce06754d.txt
_cod_data_source_block           cmr_sg_084_1
_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_Hall     -P1
_cod_original_sg_symbol_H-M      'P-1 '
_cod_database_code               7207666