Engineering short, strong hydrogen bonds in urea di-carboxylic acid complexes
Jones, Andrew O. F.; Leech, Charlotte K.; McIntyre, Garry J.; Wilson, Chick C.; Thomas, Lynne H.; CrystEngComm 16 (2014) 8177–; doi:10.1039/C4CE00587B

data_7217945
_publ_section_title
;
 Engineering short, strong hydrogen bonds in urea di-carboxylic acid
 complexes
;
_journal_issue                   35
_journal_name_full               CrystEngComm
_journal_page_first              8177
_journal_paper_doi               10.1039/C4CE00587B
_journal_volume                  16
_journal_year                    2014
_chemical_formula_sum            'C8 H18 N4 O6'
_chemical_formula_weight         266.00
_chemical_name_common
;
 bis(methylurea) succinic acid
;
_chemical_name_systematic
;
 bis(N-methylurea) butanedioic 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                 91.22
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   7.890(5)
_cell_length_b                   5.790(5)
_cell_length_c                   13.650(5)
_cell_measurement_reflns_used    250
_cell_measurement_temperature    20
_cell_volume                     623.4(7)
_computing_cell_refinement       'lauegen (CCP4)'
_computing_data_collection       'VIVALDI (MAATEL)'
_computing_data_reduction        'argonne_boxes, laue4 (Piltz, 2011)'
_computing_molecular_graphics    'Mercury (McRae, 2006)'
_computing_publication_material  'WINGX (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      20
_diffrn_detector_area_resol_mean 0.7
_diffrn_measurement_device_type  VIVALDI
_diffrn_measurement_method       'Laue patterns at 10 orientations'
_diffrn_radiation_monochromator  none
_diffrn_radiation_source         'ILL reactor source, thermal guide'
_diffrn_radiation_type           neutron
_diffrn_radiation_wavelength     0.80-5.20
_diffrn_reflns_av_R_equivalents  0.1364
_diffrn_reflns_av_sigmaI/netI    0.0854
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            13957
_diffrn_standards_number         none
_exptl_absorpt_coefficient_mu    0.000
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.417
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             12
_exptl_crystal_size_max          2.5
_exptl_crystal_size_mid          1.0
_exptl_crystal_size_min          0.8
_refine_diff_density_max         0.121
_refine_diff_density_min         -0.112
_refine_diff_density_rms         0.025
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.344
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     163
_refine_ls_number_reflns         2522
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.344
_refine_ls_R_factor_all          0.0896
_refine_ls_R_factor_gt           0.0538
_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^)+(0.0300P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0810
_refine_ls_wR_factor_ref         0.0860
_reflns_number_gt                1945
_reflns_number_total             2522
_reflns_threshold_expression     >2\s(I)
_cod_duplicate_entry             7214480
_cod_data_source_file            c4ce00587b2.cif
_cod_data_source_block           musuc_20
_cod_original_sg_symbol_H-M      P21/n
_cod_database_code               7217945