Synthesis and structural characterization of pincer type bicyclic diacyloxy- and diazaselenuranes.
Selvakumar, K.; Singh, Harkesh B.; Goel, Nidhi; Singh, Udai P.; Butcher, Ray J.; Dalton transactions (Cambridge, England : 2003) 40 (2011) 9858–9867; doi:10.1039/c1dt10862j

data_7016833
_publ_section_title
;
 Synthesis and structural characterization of pincer type bicyclic
 diacyloxy- and diazaselenuranes.
;
_journal_issue                   38
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              9858
_journal_page_last               9867
_journal_paper_doi               10.1039/c1dt10862j
_journal_volume                  40
_journal_year                    2011
_chemical_formula_moiety         'C18 H22 O2 Se'
_chemical_formula_sum            'C18 H22 O2 Se'
_chemical_formula_weight         349.32
_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                 119.536(6)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   9.4749(4)
_cell_length_b                   20.7654(6)
_cell_length_c                   9.4830(5)
_cell_measurement_reflns_used    9034
_cell_measurement_temperature    200(2)
_cell_measurement_theta_max      32.4491
_cell_measurement_theta_min      4.6862
_cell_volume                     1623.32(15)
_computing_cell_refinement
;
CrysAlis RED, Oxford Diffraction Ltd.,
Version 1.171.32.15 (release 10-01-2008 CrysAlis171 .NET)
(compiled Jan 10 2008,16:37:18)
;
_computing_data_collection
;
CrysAlis CCD, Oxford Diffraction Ltd.,
Version 1.171.32.15 (release 10-01-2008 CrysAlis171 .NET)
(compiled Jan 10 2008,16:37:18)
;
_computing_data_reduction
;
CrysAlis RED, Oxford Diffraction Ltd.,
Version 1.171.32.15 (release 10-01-2008 CrysAlis171 .NET)
(compiled Jan 10 2008,16:37:18)
;
_computing_molecular_graphics    SHELXTL
_computing_publication_material  SHELXTL
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      200(2)
_diffrn_detector_area_resol_mean 10.5081
_diffrn_measured_fraction_theta_full 0.992
_diffrn_measured_fraction_theta_max 0.916
_diffrn_measurement_device_type  'Oxford Diffraction Gemini R'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'Enhance (Mo) X-ray Source'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0345
_diffrn_reflns_av_sigmaI/netI    0.0545
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       31
_diffrn_reflns_limit_k_min       -31
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            19227
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         32.53
_diffrn_reflns_theta_min         4.70
_diffrn_standards_decay_%        <2%
_diffrn_standards_interval_count 50
_diffrn_standards_number         2
_exptl_absorpt_coefficient_mu    2.315
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.50754
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlis RED, Oxford Diffraction Ltd.,
Version 1.171.32.15 (release 10-01-2008 CrysAlis171 .NET)
(compiled Jan 10 2008,16:37:18)
Empirical absorption correction using spherical harmonics,
implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            'pale yellow'
_exptl_crystal_density_diffrn    1.429
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             720
_exptl_crystal_size_max          0.51
_exptl_crystal_size_mid          0.45
_exptl_crystal_size_min          0.28
_refine_diff_density_max         0.754
_refine_diff_density_min         -0.545
_refine_diff_density_rms         0.105
_refine_ls_extinction_coef       0.0054(8)
_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   1.135
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     196
_refine_ls_number_reflns         5417
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.135
_refine_ls_R_factor_all          0.0934
_refine_ls_R_factor_gt           0.0584
_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^)+(0.0173P)^2^+6.7024P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1337
_refine_ls_wR_factor_ref         0.1396
_reflns_number_gt                3654
_reflns_number_total             5417
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            c1dt10862j.txt
_cod_data_source_block           31
_cod_original_cell_volume        1623.31(15)
_cod_database_code               7016833