Molecular electrostatic potential dependent selectivity of hydrogen bonding
Aakeröy, Christer B.; Wijethunga, Tharanga K.; Desper, John; New J. Chem. 39 (2015) 822–; doi:10.1039/C4NJ01324G

data_7054648
_publ_section_title
;
 Molecular electrostatic potential dependent selectivity of hydrogen
 bonding
;
_journal_issue                   2
_journal_name_full               'New J. Chem.'
_journal_page_first              822
_journal_paper_doi               10.1039/C4NJ01324G
_journal_volume                  39
_journal_year                    2015
_chemical_formula_moiety
;
(C18 H16 N6) (C10 H18 O4)
;
_chemical_formula_sum            'C28 H34 N6 O4'
_chemical_formula_weight         518.61
_chemical_name_systematic
;
TW-2B-22 1,1'-di[(3-pyridyl)methyl]-2,2'-biimidazole, HOOCH-(CH2)8-COOH
;
_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                93.630(7)
_cell_angle_beta                 98.988(7)
_cell_angle_gamma                104.670(7)
_cell_formula_units_Z            1
_cell_length_a                   5.6320(7)
_cell_length_b                   6.8450(8)
_cell_length_c                   17.748(2)
_cell_measurement_reflns_used    9957
_cell_measurement_temperature    120(2)
_cell_measurement_theta_max      67.58
_cell_measurement_theta_min      2.54
_cell_volume                     649.97(14)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      120(2)
_diffrn_measured_fraction_theta_full 0.974
_diffrn_measured_fraction_theta_max 0.974
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0000
_diffrn_reflns_av_sigmaI/netI    0.0269
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -6
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            4606
_diffrn_reflns_theta_full        68.93
_diffrn_reflns_theta_max         68.93
_diffrn_reflns_theta_min         2.54
_exptl_absorpt_coefficient_mu    0.737
_exptl_absorpt_correction_T_max  0.9299
_exptl_absorpt_correction_T_min  0.7876
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            orange
_exptl_crystal_density_diffrn    1.325
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             276
_exptl_crystal_size_max          0.34
_exptl_crystal_size_mid          0.26
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.322
_refine_diff_density_min         -0.451
_refine_diff_density_rms         0.093
_refine_ls_extinction_coef       0.018(4)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.544
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     177
_refine_ls_number_reflns         4606
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.544
_refine_ls_R_factor_all          0.0658
_refine_ls_R_factor_gt           0.0550
_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^)+(0.1000P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1820
_refine_ls_wR_factor_ref         0.1976
_reflns_number_gt                3942
_reflns_number_total             4606
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c4nj01324g2.cif
_cod_data_source_block           A1:Seb
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Triclinic' changed to 'triclinic'
according to
/usr/data/users/saulius/crontab/automatic-downloads/current/RSC/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 
;
_cod_original_cell_volume        649.97(13)
_cod_original_sg_symbol_H-M      P-1
_cod_database_code               7054648