Crystal structure of theophylline-7-acetic acid, C~9~H~10~N~4~O~4~
Zhang, L.-J.; Liu, M.-C.; Ding, J.-C.; Wu, H.-Y.; Zeitschrift für Kristallographie - New Crystal Structures 221 (2006) 59–60; doi:

data_8101921
_publ_section_title
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Crystal structure of theophylline-7-acetic acid, C~9~H~10~N~4~O~4~
;
_journal_issue                   1
_journal_name_full
'Zeitschrift f\"ur Kristallographie - New Crystal Structures'
_journal_page_first              59
_journal_page_last               60
_journal_volume                  221
_journal_year                    2006
_chemical_formula_moiety         'C9 H10 N4 O4'
_chemical_formula_sum            'C9 H10 N4 O4'
_chemical_formula_weight         238.21
_chemical_name_systematic
; 
Theophylline-7-acetic acid
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 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                 98.657(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   9.5418(11)
_cell_length_b                   7.2415(9)
_cell_length_c                   14.4455(17)
_cell_measurement_reflns_used    1422
_cell_measurement_temperature    298(2)
_cell_measurement_theta_max      24.68
_cell_measurement_theta_min      2.40
_cell_volume                     986.8(2)
_computing_cell_refinement       'SAINT (Bruker, 2002)'
_computing_data_collection       'SMART (Bruker, 2002)'
_computing_data_reduction        SAINT
_computing_molecular_graphics    'SHELXTL(Bruker, 2002)'
_computing_publication_material  'SHELXL-97 (Bruker, 2002)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      298(2)
_diffrn_measured_fraction_theta_full 0.994
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_device_type  'Bruker SMART APEX CCD'
_diffrn_measurement_method       phi/omega
_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  0.0318
_diffrn_reflns_av_sigmaI/netI    0.0443
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       11
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            5068
_diffrn_reflns_theta_full        25.27
_diffrn_reflns_theta_max         25.27
_diffrn_reflns_theta_min         2.40
_diffrn_standards_decay_%        0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.129
_exptl_absorpt_correction_T_max  0.9835
_exptl_absorpt_correction_T_min  0.9757
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS, Bruker 2002)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.603
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             496
_exptl_crystal_size_max          0.16
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.09
_refine_diff_density_max         0.328
_refine_diff_density_min         -0.171
_refine_diff_density_rms         0.050
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.059
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     157
_refine_ls_number_reflns         1788
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.059
_refine_ls_R_factor_all          0.0681
_refine_ls_R_factor_gt           0.0525
_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^)+(0.0629P)^2^+0.4979P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1286
_refine_ls_wR_factor_ref         0.1377
_reflns_number_gt                1458
_reflns_number_total             1788
_reflns_threshold_expression     I>2sigma(I)
_cod_data_source_file            1267-1716.cff
_cod_data_source_block           I
_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.

'_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_enum 1555 2011-01-17 13:19:09Z saulius 
;
_cod_original_sg_symbol_Hall     -P2yn
_cod_original_sg_symbol_H-M      P12(1)/n1
_cod_database_code               8101921