Biphenyl- and phenylnaphthalenyl-substituted 1<i>H</i>-imidazole-4,5-dicarbonitrile catalysts for the coupling reaction of nucleoside methyl phosphonamidites
Bats, Jan W.; Schell, Peter; Engels, Joachim W.; Acta Crystallographica Section C 69 (2013) 529–533; doi:10.1107/S0108270113009293

data_2018948
_publ_section_title
;
 Biphenyl- and phenylnaphthalenyl-substituted
 1<i>H</i>-imidazole-4,5-dicarbonitrile catalysts for the coupling
 reaction of nucleoside methyl phosphonamidites
;
_journal_coeditor_code           EG3118
_journal_issue                   5
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              529
_journal_page_last               533
_journal_paper_doi               10.1107/S0108270113009293
_journal_volume                  69
_journal_year                    2013
_chemical_formula_iupac          'C23 H16 N4'
_chemical_formula_moiety         'C23 H16 N4'
_chemical_formula_sum            'C23 H16 N4'
_chemical_formula_weight         348.40
_chemical_melting_point          514.0(10)
_chemical_name_systematic
2-[8-(3,5-Dimethylphenyl)naphthalen-1-yl]-1<i>H</i>-imidazole-4,5-dicarbonitrile
_space_group_IT_number           29
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2c -2ac'
_symmetry_space_group_name_H-M   'P c a 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   16.7042(14)
_cell_length_b                   7.1632(7)
_cell_length_c                   15.0528(11)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    294(2)
_cell_measurement_theta_max      62
_cell_measurement_theta_min      46
_cell_volume                     1801.2(3)
_computing_cell_refinement       'CAD-4 Software (Enraf--Nonius, 1989)'
_computing_data_collection       'CAD-4 Software (Enraf--Nonius, 1989)'
_computing_data_reduction        'MolEN (Fair, 1990)'
_computing_molecular_graphics    'SHELXTL (Sheldrick, 2008)'
_computing_publication_material  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      294(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Enraf--Nonius CAD-4'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54180
_diffrn_reflns_av_R_equivalents  0.0190
_diffrn_reflns_av_sigmaI/netI    0.0092
_diffrn_reflns_limit_h_max       20
_diffrn_reflns_limit_h_min       -20
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            3815
_diffrn_reflns_theta_full        69.89
_diffrn_reflns_theta_max         69.89
_diffrn_reflns_theta_min         5.30
_diffrn_standards_decay_%        2.0
_diffrn_standards_interval_time  90
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.615
_exptl_absorpt_correction_T_max  0.857
_exptl_absorpt_correction_T_min  0.776
_exptl_absorpt_correction_type   psi-scan
_exptl_absorpt_process_details   'MolEN (Fair, 1990)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.285
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             728
_exptl_crystal_size_max          0.60
_exptl_crystal_size_mid          0.40
_exptl_crystal_size_min          0.25
_refine_diff_density_max         0.133
_refine_diff_density_min         -0.122
_refine_ls_extinction_coef       0.0137(6)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL97 (Sheldrick, 2008)'
_refine_ls_goodness_of_fit_ref   1.053
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     251
_refine_ls_number_reflns         1781
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.053
_refine_ls_R_factor_all          0.0271
_refine_ls_R_factor_gt           0.0268
_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^)+(0.046P)^2^+0.15P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0701
_refine_ls_wR_factor_ref         0.0703
_reflns_number_gt                1753
_reflns_number_total             1781
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            eg3118.cif
_cod_data_source_block           III
_cod_database_code               2018948
_cod_database_fobs_code          2018948