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_7207662
_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         'C8 H10 N4 O2, C6 H5 Cl N2 O2'
_chemical_formula_sum            'C14 H15 Cl N6 O4'
_chemical_formula_weight         366.77
_chemical_melting_point          420.53
_chemical_name_common            Caffeine:4-chloro-3nitroaniline
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 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                 95.6570(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.7950(6)
_cell_length_b                   13.5627(9)
_cell_length_c                   14.9920(10)
_cell_measurement_reflns_used    9981
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      32.48
_cell_measurement_theta_min      3.03
_cell_volume                     1577.25(19)
_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      100(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  0.0222
_diffrn_reflns_av_sigmaI/netI    0.0175
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            13582
_diffrn_reflns_theta_full        26.98
_diffrn_reflns_theta_max         26.98
_diffrn_reflns_theta_min         2.63
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.278
_exptl_absorpt_correction_T_max  0.986
_exptl_absorpt_correction_T_min  0.977
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'multi-scan absorption correction'
_exptl_crystal_colour            brown
_exptl_crystal_density_diffrn    1.545
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             760
_exptl_crystal_size_max          0.5
_exptl_crystal_size_mid          0.07
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.452
_refine_diff_density_min         -0.226
_refine_diff_density_rms         0.046
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.035
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     241
_refine_ls_number_reflns         3420
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.035
_refine_ls_R_factor_all          0.0355
_refine_ls_R_factor_gt           0.0330
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0538P)^2^+0.7563P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0936
_refine_ls_wR_factor_ref         0.0969
_reflns_number_gt                3181
_reflns_number_total             3420
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c2ce06754d.txt
_cod_data_source_block           cmr_sg_069_1
_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_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_Hall     -P2ybc
_cod_original_sg_symbol_H-M      'P2(1)/c '
_cod_database_code               7207662