Synthesis and Structural Characterization of 1-Mesityl-1,3-dihydro-imidazole-2-selone and Bis(1-mesitylimidazol-2-yl)diselenide: Experimental Evidence That the Selone Is More Stable Than the Selenol Tautomer
Victoria K. Landry; Mao Minoura; Keliang Pang; Daniela Buccella; Bryte V. Kelly; Gerard Parkin; Journal of the American Chemical Society 128 (2006) 12490–12497; doi:10.1021/ja063168e

data_4110900
_publ_section_title
;
 Synthesis and Structural Characterization of
 1-Mesityl-1,3-dihydro-imidazole-2-selone and
 Bis(1-mesitylimidazol-2-yl)diselenide: Experimental Evidence That the
 Selone Is More Stable Than the Selenol Tautomer
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              12490
_journal_page_last               12497
_journal_paper_doi               10.1021/ja063168e
_journal_volume                  128
_journal_year                    2006
_chemical_formula_sum            'C24 H26 N4 Se2'
_chemical_formula_weight         528.41
_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                 102.7760(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   9.6415(7)
_cell_length_b                   15.6136(12)
_cell_length_c                   16.0959(12)
_cell_measurement_temperature    516(2)
_cell_volume                     2363.1(3)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SHELXTL'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      516(2)
_diffrn_measured_fraction_theta_full 0.910
_diffrn_measured_fraction_theta_max 0.910
_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  0.0249
_diffrn_reflns_av_sigmaI/netI    0.0292
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       20
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            15396
_diffrn_reflns_theta_full        28.27
_diffrn_reflns_theta_max         28.27
_diffrn_reflns_theta_min         1.84
_exptl_absorpt_coefficient_mu    3.147
_exptl_absorpt_correction_T_max  0.5718
_exptl_absorpt_correction_T_min  0.5718
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            orange
_exptl_crystal_density_diffrn    1.485
_exptl_crystal_description       block
_exptl_crystal_F_000             1064
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.355
_refine_diff_density_min         -0.406
_refine_diff_density_rms         0.055
_refine_ls_extinction_coef       0.0006(2)
_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   1.088
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     272
_refine_ls_number_reflns         5332
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.088
_refine_ls_R_factor_all          0.0512
_refine_ls_R_factor_gt           0.0310
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0414P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0778
_refine_ls_wR_factor_ref         0.0827
_reflns_number_gt                3833
_reflns_number_total             5332
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja063168esi20060505_025938.cif
_cod_data_source_block           messe1
_cod_database_code               4110900