Dissociation of 2,4-Bis(2,4,6-tri-tert-butylphenyl)-cyclo-1,3-dipnicta-2,4-diazanes (pnict = P, As, Sb) Imposed by Substituent Steric Strain: A Cyclobutane/Olefin Analogy
Neil Burford; T. Stanley Cameron; Charles L. B. Macdonald; Katherine N. Robertson; Robert Schurko; Denise Walsh; Robert McDonald; Roderick E. Wasylishen; Inorganic Chemistry 44 (2005) 8058–8064; doi:10.1021/ic050770h

data_4309843
_publ_contact_author_address
;
Department of Chemistry
Dalhousie University
Halifax, Nova Scotia
B3H 4J3
Canada
;
_publ_contact_author_email       ' neil.burford@dal.ca '
_publ_contact_author_fax         ' (902) 494-1310 '
_publ_contact_author_name        ' Neil Burford'
_publ_contact_author_phone       ' (902) 494-3190 '
_publ_section_title
;
Dissociation of
2,4-Bis(2,4,6-tri-tert-butylphenyl)-cyclo-1,3-dipnicta-2,4-diazanes (pnict
= P, As, Sb) Imposed by Substituent Steric Strain: A Cyclobutane/Olefin
Analogy
;
_journal_name_full               'Inorganic Chemistry'
_journal_page_first              8058
_journal_page_last               8064
_journal_paper_doi               10.1021/ic050770h
_journal_volume                  44
_journal_year                    2005
_chemical_formula_moiety         'C36 H58 As2 Cl2 N2 '
_chemical_formula_sum            'C36 H58 As2 Cl2 N2'
_chemical_formula_weight         739.62
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      14
_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
_cell_angle_alpha                90
_cell_angle_beta                 113.66(4)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   10.397(7)
_cell_length_b                   17.611(6)
_cell_length_c                   11.442(7)
_cell_measurement_reflns_used    20
_cell_measurement_temperature    213(2)
_cell_measurement_theta_max      18.2
_cell_measurement_theta_min      15.0
_cell_volume                     1919(2)
_computing_cell_refinement       'MSC/AFC Diffractometer Control'
_computing_data_collection       'MSC/AFC Diffractometer Control'
_computing_data_reduction
;
teXsan for Windows version 1.06 (MSC, 1997-1999)
;
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution
;
SIR97 (Altomare, et. al. 1997)
;
_diffrn_ambient_temperature      213(2)
_diffrn_measured_fraction_theta_full 0.931
_diffrn_measured_fraction_theta_max 0.931
_diffrn_measurement_device       'Rigaku AFC5R'
_diffrn_measurement_method       \w-2\q
_diffrn_orient_matrix_UB_11      -0.05606
_diffrn_orient_matrix_UB_12      -0.02396
_diffrn_orient_matrix_UB_13      0.04360
_diffrn_orient_matrix_UB_21      0.00391
_diffrn_orient_matrix_UB_22      -0.04982
_diffrn_orient_matrix_UB_23      -0.04037
_diffrn_orient_matrix_UB_31      0.08871
_diffrn_orient_matrix_UB_32      -0.01295
_diffrn_orient_matrix_UB_33      0.07465
_diffrn_radiation_detector       'scintillation counter'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'Rigaku rotating anode'
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.7107
_diffrn_reflns_av_R_equivalents  0.04973
_diffrn_reflns_av_sigmaI/netI    0.178
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       20
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            3493
_diffrn_reflns_reduction_process 'Lp corrections applied'
_diffrn_reflns_theta_full        25.05
_diffrn_reflns_theta_max         25.05
_diffrn_reflns_theta_min         2.52
_diffrn_standards_decay_%        -5.08
_diffrn_standards_interval_count 150
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    1.906
_exptl_absorpt_correction_T_max  0.8323
_exptl_absorpt_correction_T_min  0.5987
_exptl_absorpt_correction_type   psi-scan
_exptl_absorpt_process_details
;
North,Phillips & Mathews, 1968
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.280
_exptl_crystal_density_meas      ?
_exptl_crystal_description       plate
_exptl_crystal_F_000             776.00
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.25
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.621
_refine_diff_density_min         -1.161
_refine_diff_density_rms         0.161
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.042
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_constraints    0
_refine_ls_number_parameters     193
_refine_ls_number_reflns         3165
_refine_ls_number_restraints     112
_refine_ls_restrained_S_all      1.033
_refine_ls_R_factor_all          0.2660
_refine_ls_R_factor_gt           0.0554
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
;
w=1/[\s^2^(Fo^2^)+(0.0000P)^2^+18.9382P] where P=(Fo^2^+2Fc^2^)/3
;
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1191
_refine_ls_wR_factor_ref         0.1738
_reflns_number_gt                1158
_reflns_number_total             3165
_reflns_threshold_expression     I>2.00\s(I)
_cod_data_source_file            ic050770hsi20050513_022640_3.cif
_cod_data_source_block           '[Mes*NAsCl]2'
_cod_original_sg_symbol_Hall     '-P 2yn '
_cod_original_sg_symbol_H-M      'P 21/n '
_cod_original_formula_sum        'C36 H58 As2 Cl2 N2 '
_cod_database_code               4309843