Gradual Transition from NH···Pyridyl Hydrogen Bonding to the NH···O Tape Synthon in Pyridyl Ureas
Byrne, Peter; Turner, David R.; Lloyd, Gareth O.; Clarke, Nigel; Steed, Jonathan W.; Crystal Growth & Design 8 (2008) 3335–; doi:10.1021/cg800247f

data_4503670
_publ_section_title
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 Gradual Transition from NH&#x00B7;&#x00B7;&#x00B7;Pyridyl Hydrogen
 Bonding to the NH&#x00B7;&#x00B7;&#x00B7;O Tape Synthon in Pyridyl Ureas
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_journal_issue                   9
_journal_name_full               'Crystal Growth &amp; Design'
_journal_page_first              3335
_journal_paper_doi               10.1021/cg800247f
_journal_volume                  8
_journal_year                    2008
_chemical_formula_moiety         'C16 H20 N6 O2'
_chemical_formula_sum            'C16 H20 N6 O2'
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_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                79.026(11)
_cell_angle_beta                 87.000(11)
_cell_angle_gamma                88.644(10)
_cell_formula_units_Z            2
_cell_length_a                   6.244(4)
_cell_length_b                   7.169(4)
_cell_length_c                   17.566(11)
_cell_measurement_reflns_used    880
_cell_measurement_temperature    393(2)
_cell_measurement_theta_max      28.958
_cell_measurement_theta_min      2.912
_cell_volume                     770.8(8)
_computing_cell_refinement       Saint
_computing_data_collection       Smart
_computing_data_reduction        Saint
_computing_molecular_graphics    Xseed
_computing_publication_material  Xseed
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      393(2)
_diffrn_measured_fraction_theta_full 0.988
_diffrn_measured_fraction_theta_max 0.988
_diffrn_measurement_device_type  'Smart 6K'
_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  0.0325
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_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
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_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            5407
_diffrn_reflns_theta_full        24.99
_diffrn_reflns_theta_max         24.99
_diffrn_reflns_theta_min         1.18
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.098
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.415
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             348
_exptl_crystal_size_max          0.34
_exptl_crystal_size_mid          0.23
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.316
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_refine_ls_extinction_method     none
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_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     217
_refine_ls_number_reflns         2690
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_refine_ls_R_factor_all          0.0877
_refine_ls_R_factor_gt           0.0762
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_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0674P)^2^+1.4740P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1865
_refine_ls_wR_factor_ref         0.1926
_reflns_number_gt                2347
_reflns_number_total             2690
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            cg800247f_si_008.cif
_cod_data_source_block           z:\xraydata\peter\06srv303\work\xs
_cod_depositor_comments
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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 
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_cod_original_cell_volume        770.7(8)
_cod_original_sg_symbol_H-M      P-1
_cod_database_code               4503670