Bis(phosphinimino)methyl derivatives of Ca, Sr and Ba: facile access to heavier alkaline earth organometallic chemistry.
Michael Hill; Peter B. Hitchcock; Chemical communications (Cambridge, England)  (2003) –; doi:10.1039/b305430f

data_7103788
_publ_section_title
;
Bis(phosphinimino)methyl derivatives of Ca, Sr and
Ba: facile access to heavier alkaline earth organometallic chemistry.
;
_journal_name_full
'Chemical communications (Cambridge, England)'
_journal_paper_doi               10.1039/b305430f
_journal_year                    2003
_chemical_compound_source        'synthesis as described'
_chemical_formula_moiety         'C53 H69 N3 O1 P2 Si2 Sr1'
_chemical_formula_sum            'C53 H69 N3 O P2 Si2 Sr'
_chemical_formula_weight         969.85
_chemical_name_common
;
[Sr(thf){N(SiMe3)2}(MesNPPh2CHPPh2NMes)]
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      14
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_conform_dict_location     ftp://ftp.iucr.org/pub/cif_core.dic
_audit_conform_dict_name         cif_core.dic
_audit_conform_dict_version      2.2
_audit_creation_date             2003-03-24T17:11:49-00:00
_audit_creation_method           'WinGX routine CIF_UPDATE'
_cell_angle_alpha                90
_cell_angle_beta                 104.566(3)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   12.7105(1)
_cell_length_b                   23.1523(2)
_cell_length_c                   18.4217(1)
_cell_measurement_reflns_used    43541
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      27.485
_cell_measurement_theta_min      3.705
_cell_measurement_wavelength     0.71073
_cell_volume                     5246.85(7)
_computing_cell_refinement       'HKL Scalepack (Otwinowski & Minor 1997)'
_computing_data_collection       'Collect (Nonius BV, 1997-2000)'
_computing_data_reduction
'HKL Denzo and Scalepack (Otwinowski & Minor 1997)'
_computing_molecular_graphics    'Ortep-3 for Windows (Farrugia, 1997)'
_computing_publication_material  'WinGX publication routines (Farrugia, 1999)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.992
_diffrn_measured_fraction_theta_max 0.992
_diffrn_measurement_device       '95mm CCD camera on \k-goniostat'
_diffrn_measurement_device_type  KappaCCD
_diffrn_measurement_method       CCD
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0573
_diffrn_reflns_av_unetI/netI     0.0374
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       30
_diffrn_reflns_limit_k_min       -29
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            66071
_diffrn_reflns_theta_full        27.48
_diffrn_reflns_theta_max         27.48
_diffrn_reflns_theta_min         3.75
_exptl_absorpt_coefficient_mu    1.173
_exptl_absorpt_correction_T_max  0.8878
_exptl_absorpt_correction_T_min  0.7981
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
[c.f. r.h. blessing, acta cryst. (1995), a51, 33-38]
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.228
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             2048
_exptl_crystal_size_max          0.2
_exptl_crystal_size_mid          0.1
_exptl_crystal_size_min          0.1
_refine_diff_density_max         0.947
_refine_diff_density_min         -0.671
_refine_diff_density_rms         0.058
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.022
_refine_ls_hydrogen_treatment    riding
_refine_ls_matrix_type           full
_refine_ls_number_parameters     556
_refine_ls_number_reflns         11945
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.022
_refine_ls_R_factor_all          0.0558
_refine_ls_R_factor_gt           0.0392
_refine_ls_shift/su_max          0.006
_refine_ls_shift/su_mean         0
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0296P)^2^+5.3258P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0819
_refine_ls_wR_factor_ref         0.0892
_reflns_number_gt                9793
_reflns_number_total             11945
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b305430f.txt
_cod_data_source_block           mar1503
_cod_original_sg_symbol_H-M      P2(1)/c
_cod_original_formula_sum        'C53 H69 N3 O1 P2 Si2 Sr1'
_cod_database_code               7103788