Hydrogen Bonding in Crystal Structures ofN,N‘-Bis(3-pyridyl)urea. Why Is the N−H···O Tape Synthon Absent in Diaryl Ureas with Electron-Withdrawing Groups?
Reddy, L. Sreenivas; Basavoju, Srinivas; Vangala, Venu R.; Nangia, Ashwini; Crystal Growth & Design 6 (2006) 161–; doi:10.1021/cg0580152

data_4504806
_publ_section_title
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 Hydrogen Bonding in Crystal Structures ofN,N&#x2018;-Bis(3-pyridyl)urea.
 Why Is the N&#x2212;H&#x00B7;&#x00B7;&#x00B7;O Tape Synthon Absent in
 Diaryl Ureas with Electron-Withdrawing Groups?
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_journal_issue                   1
_journal_name_full               'Crystal Growth &amp; Design'
_journal_page_first              161
_journal_paper_doi               10.1021/cg0580152
_journal_volume                  6
_journal_year                    2006
_chemical_formula_moiety         'C11 H10 N4 O3, H2 O'
_chemical_formula_sum            'C11 H12 N4 O4'
_chemical_formula_weight         264.25
_chemical_melting_point          552
_chemical_name_common            'N,N'-bis(3-pyridyl-N-oxide)urea dihydrate'
_chemical_name_systematic
; 
 N,N'-bis(3-pyridyl-N-oxide)urea dihydrate  
;
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/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                 90.650(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   7.9686(7)
_cell_length_b                   12.2243(11)
_cell_length_c                   24.538(2)
_cell_measurement_reflns_used    4983
_cell_measurement_temperature    298(2)
_cell_measurement_theta_max      23.67
_cell_measurement_theta_min      3.05
_cell_volume                     2390.1(4)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      298(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_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'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0340
_diffrn_reflns_av_sigmaI/netI    0.0191
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       30
_diffrn_reflns_limit_l_min       -30
_diffrn_reflns_number            17207
_diffrn_reflns_theta_full        26.06
_diffrn_reflns_theta_max         26.06
_diffrn_reflns_theta_min         1.66
_exptl_absorpt_coefficient_mu    0.115
_exptl_absorpt_correction_T_max  0.9875
_exptl_absorpt_correction_T_min  0.9577
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Bruker AXS SADABS program'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.469
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       rhombus
_exptl_crystal_F_000             1104
_exptl_crystal_size_max          0.38
_exptl_crystal_size_mid          0.24
_exptl_crystal_size_min          0.11
_refine_diff_density_max         0.179
_refine_diff_density_min         -0.169
_refine_diff_density_rms         0.037
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.124
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     189
_refine_ls_number_reflns         2349
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.124
_refine_ls_R_factor_all          0.0559
_refine_ls_R_factor_gt           0.0462
_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^)+(0.0432P)^2^+1.4997P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1045
_refine_ls_wR_factor_ref         0.1097
_reflns_number_gt                1994
_reflns_number_total             2349
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            cg0580152_dipyurea_n-oxide_8_hydrate.cif
_cod_data_source_block           an196_1,3-bis(3-pyridyl-N-oxide)urea
_cod_depositor_comments
;
The following automatic conversions were performed:

'_chemical_melting_point' value '552K' was changed to '552' - the
value should be numeric and without a unit
designator.

'_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     '-C 2yc '
_cod_original_sg_symbol_H-M      'C 2/ c'
_cod_database_code               4504806