Electron and nuclear positions in the short hydrogen bond in urotropine-N-oxide.formic acid.
Nygren, Cara L.; Wilson, Chick C.; Turner, John F. C.; The journal of physical chemistry. A 109 (2005) 1911–1919; doi:10.1021/jp047187r

data_1506373
_publ_section_title
;
 Electron and nuclear positions in the short hydrogen bond in
 urotropine-N-oxide.formic acid.
;
_journal_issue                   9
_journal_name_full               'The journal of physical chemistry. A'
_journal_page_first              1911
_journal_page_last               1919
_journal_paper_doi               10.1021/jp047187r
_journal_volume                  109
_journal_year                    2005
_chemical_formula_moiety         'C6 H12 N4 O, C H2 O2'
_chemical_formula_sum            'C7 H14 N4 O3'
_chemical_formula_weight         202.22
_chemical_name_systematic
; 
urotropine-N-oxide^.^formic 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                 95.446(5)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   6.7679(19)
_cell_length_b                   6.779(2)
_cell_length_c                   19.487(6)
_cell_measurement_reflns_used    7122
_cell_measurement_temperature    148(2)
_cell_measurement_theta_max      28.34
_cell_measurement_theta_min      2.10
_cell_volume                     890.0(5)
_computing_cell_refinement       'SAINT (Bruker 1997)'
_computing_data_collection       'SMART (Bruker 1997)'
_computing_data_reduction        'SAINT (Bruker 1997)'
_computing_molecular_graphics    'SHELXTL (Sheldrick, 1997)'
_computing_publication_material  'SHELXTL (Sheldrick, 1997)'
_computing_structure_refinement  'SHELX-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELX-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      148(2)
_diffrn_detector_area_resol_mean 'not measured'
_diffrn_measured_fraction_theta_full 0.971
_diffrn_measured_fraction_theta_max 0.971
_diffrn_measurement_device_type  'Bruker AXS CCD'
_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  0.0232
_diffrn_reflns_av_sigmaI/netI    0.0182
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            9144
_diffrn_reflns_theta_full        28.34
_diffrn_reflns_theta_max         28.34
_diffrn_reflns_theta_min         2.10
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.119
_exptl_absorpt_correction_T_max  0.980
_exptl_absorpt_correction_T_min  0.842
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS; Sheldrick, 1996)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.509
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       fragment
_exptl_crystal_F_000             432
_exptl_crystal_size_max          0.32
_exptl_crystal_size_mid          0.19
_exptl_crystal_size_min          0.17
_refine_diff_density_max         0.388
_refine_diff_density_min         -0.186
_refine_diff_density_rms         0.049
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.037
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     131
_refine_ls_number_reflns         2145
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.037
_refine_ls_R_factor_all          0.0393
_refine_ls_R_factor_gt           0.0349
_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^)+(0.0600P)^2^+0.2951P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0990
_refine_ls_wR_factor_ref         0.1043
_reflns_number_gt                1900
_reflns_number_total             2145
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            jp047187rsi20040628_073905.cif
_cod_data_source_block           oct27m
_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 

The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'not measured' was changed to '?'
- the value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 
;
_cod_original_cell_volume        890.0(4)
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               1506373