Formation of a new class of 7pi radicals via sterically induced P-P bond cleavage of the dimers [(CH)2(NR)2P]2.
Edge, Ruth; Less, Robert J; McInnes, Eric J L; Müther, Kristine; Naseri, Vesal; Rawson, Jeremy M; Wright, Dominic S; Chemical communications (Cambridge, England) 34 (2009) 1691–1693; doi:10.1039/b821241d

data_7104281
_publ_section_title
;
 Formation of a new class of 7pi radicals via sterically induced P-P
 bond cleavage of the dimers [(CH)2(NR)2P]2.
;
_journal_issue                   13
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              1691
_journal_page_last               1693
_journal_paper_doi               10.1039/b821241d
_journal_volume                  34
_journal_year                    2009
_chemical_formula_moiety         'C52 H72 N4 P2, 0.25(C4 H8 O)'
_chemical_formula_sum            'C53 H74 N4 O0.25 P2'
_chemical_formula_weight         833.10
_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                72.598(1)
_cell_angle_beta                 77.804(1)
_cell_angle_gamma                81.880(1)
_cell_formula_units_Z            4
_cell_length_a                   12.1056(1)
_cell_length_b                   20.2299(2)
_cell_length_c                   21.6313(2)
_cell_measurement_reflns_used    35857
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      25.03
_cell_measurement_theta_min      1.00
_cell_volume                     4923.51(8)
_computing_cell_refinement       'HKL Scalepack (Otwinowski & Minor 1997)'
_computing_data_collection       'Collect (Nonius B.V. 1998)'
_computing_data_reduction
;
HKL Denzo and Scalepack (Otwinowski & Minor 1997)
;
_computing_publication_material  'SHELXL-97 (Sheldrick 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick 1997)'
_computing_structure_solution    'SIR-92 (Altomare et al. 1994)'
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 0.988
_diffrn_measured_fraction_theta_max 0.988
_diffrn_measurement_device_type  'Nonius Kappa CCD'
_diffrn_measurement_method       'Thin slice \w and \f scans'
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0337
_diffrn_reflns_av_sigmaI/netI    0.0341
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       24
_diffrn_reflns_limit_k_min       -23
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            57801
_diffrn_reflns_theta_full        25.04
_diffrn_reflns_theta_max         25.04
_diffrn_reflns_theta_min         3.53
_exptl_absorpt_coefficient_mu    0.127
_exptl_absorpt_correction_T_max  0.989
_exptl_absorpt_correction_T_min  0.940
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
multi-scan from symmetry-related measurements
Sortav (Blessing 1995)
;
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.124
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1808
_exptl_crystal_size_max          0.42
_exptl_crystal_size_mid          0.18
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.301
_refine_diff_density_min         -0.285
_refine_diff_density_rms         0.037
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.016
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     1122
_refine_ls_number_reflns         17212
_refine_ls_number_restraints     5
_refine_ls_restrained_S_all      1.016
_refine_ls_R_factor_all          0.0518
_refine_ls_R_factor_gt           0.0378
_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^)+(0.0368P)^2^+2.2495P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0873
_refine_ls_wR_factor_ref         0.0956
_reflns_number_gt                14137
_reflns_number_total             17212
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b821241d.txt
_cod_data_source_block           dw0844
_cod_original_sg_symbol_H-M      P-1
_cod_database_code               7104281